Using perf-tools in embedded linux
perf-tools is a collection of performance analysis tools based on perf events developed by Brendan Gregg, perf-tools are widely used on linux server and can ...
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debug
Wireless debugging with esplink
Serial console is always an very important tool when doing low level development such as kernel or bootloader, the most commonly used are the USB to serial c...
Learning Resources
This is a list of resources I used for expanding my knowledge on U-Boot, kernel and other stuff related embedded system.
Debugging Mini2440 with OpenOCD
Bring board up for the first time, it usually involves debugging with JTAG, in this post I will be using OpenJTAG for mini2440, showing how to load program w...
gdb cheatsheet
breakpoint
Random Kernel Debugging Tips
All-zero address shown when do cat /proc/modules echo 0 > /proc/sys/kernel/kptr_restrict # or with sysctl sysctl kernel.kptr_restrict=0
Kernel Debugging With Kgdb
In Kernel memory debugging techniques, we talked about using script decode_stacktrace.sh to translate addresses to lines, or if only interested in one entry ...
Debugging kernel with dynamic debug
Dynamic debug is a great feature for kernel debugging, kernel must be compiled with CONFIG_DYNAMIC_DEBUG option, if it was enabled, all pr_debug(), dev_dbg()...
Android procfs demystified – sysrq-trigger
The magic SysRq key is a key combination(Alt+SysRq+<cmd>) implemented by linux kernel, it is usually used to get more information for further investiga...
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
Android native memory debugging
malloc_debug
How to do make debugging
Verbose output
How to Debug Shell Scripts
In order to find out where the problem is with my script, I often use echo for debugging, print line number with echo ${LINENO}, but it is not a optimium way...
docker
Install Gitea with Docker
docker-compose
Build Famliy Album with PhotoPrism
After I uploaded my photos to nextcloud, I realized, nextcloud is probably not a good choice for hosting photos, so this time I try to manage these photos wi...
NextCloud with Docker
Previously I deployed a nextcloud container in digitalocean droplet for my note synchronization. This time I want use nextcloud to hold all my documents and ...
Setup Build Environment with Vagrant
As a system engineer, I have to manage various build envrionmets, build all the projects against one Ubuntu version became imposssible, one change for one pr...
Smart Home: Install Home Assistant Supervised
Previously I installed HassOS, it works pretty well except the fact that it is a black box for me at some extent, this time, I take a step further and try to...
An Incomplete Guide to Docker
Install docker on Armbian
Smart Home: Install Home Assistant on Docker
This is a quick setup of home assistant with docker compose.
Install Pi-hole with Docker on Phicomm N1
Install required packages ```bash $ sudo apt install docker.io -y $ sudo apt install docker-compose -y $ sudo apt install lighttpd -y
raspberrypi
Build Embedded Linux System with Yocto Project
Prepare for build yocto project
Smart Home: Install Home Assistant Supervised
Previously I installed HassOS, it works pretty well except the fact that it is a black box for me at some extent, this time, I take a step further and try to...
Smart Home: Getting Started with Home Assistant on Raspberry Pi
Various types of smart devices designed for smart home are developed, part of them can be connected to apple HomeKit, or connected to vendor’s ECO-system, th...
Running LineageOS 16 on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
Running LineageOS on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
Running Android Oreo on Raspberry Pi 3B
Setup Build Environment (Ubuntu 16.04)
Build kernel image for Raspberry Pi 3B
Download source code git clone --depth=1 https://github.com/raspberrypi/linux.git
mini2440
Understanding Timing Parameters in Nand Flash Controller
The NAND flash used in mini2440 is from Samsung, the part number is K9F2G08U0C, the meaning of it is defined in Samsung Part Number Decoder, we can get the b...
U-Boot: Boot FIT Kernel Image
The way build ramdisk is not an option for me, load both uImage and ramdisk with U-Boot seems not a good way either, and as uImage is a legacy format, there ...
Bring Latest Linux Kernel to MINI2440
Poring Linux kernel to board is much easier than the age of version 2.6, I want to make an update my school projects, part of this procedure involves the ker...
U-Boot: Understanding lowlevel_init
MINI2440 has two SDRAM chips on board, different version have different chipset, my SDRAM is EM63A165TS-6G from EtronTech, the pin and timing is compatible w...
U-Boot: Understanding Start.S
U-Boot is a universal bootloader for many architectures, the U-Boot image build against current version (u-boot-2020.10) cannot fit the size of stepping zone...
Debugging Mini2440 with OpenOCD
Bring board up for the first time, it usually involves debugging with JTAG, in this post I will be using OpenJTAG for mini2440, showing how to load program w...
git
Remove Git Commit from History
Occasionally, you may want to remove a commit from github/gitlab, for example, I pushed a commit to switched the jekyll theme from minima to minimal mistakes...
Using Git Like a Pro – aliases
Aliases are created through the use of the git config command, and will be saved to $HOME/.gitconfig, use below two commands to see a list of aliases:
Shell - batch revert and push to gerrit
This post illustrates how to revert a commit in many branches, say 100 for example, and then push to gerrit server with reviewers added.
import code to empty git repo
I am planning to make android pie runnning on our latest proudct, Continuous Integration team has initialized all the git project, inside citrix, but there i...
git cheatsheet
Create a tag git tag -a v1.0 -m "milestone: v1" git push --tags
Android
Android procfs demystified – sysrq-trigger
The magic SysRq key is a key combination(Alt+SysRq+<cmd>) implemented by linux kernel, it is usually used to get more information for further investiga...
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
Analyzing Android Boot Time with Bootchart and Systrace
Introduction Bootchart is a great tool for performance analysis and visualization of the Linux/Android boot process, it consists of two parts: data collectio...
Enable zram on Android
What is zram Kernel Documentation says it is Compressed RAM based block devices.
Android cheatsheet
dumpsys
perf
Using perf-tools in embedded linux
perf-tools is a collection of performance analysis tools based on perf events developed by Brendan Gregg, perf-tools are widely used on linux server and can ...
Build Linux Perf for MIPS
The perf tool has been tested with ingenic T40.
How to split subdirectory into a separate git repository
In this post, I’ll show you how to split tools/perf in linux tree into an separate git repository without losing the commit history.
open source perf tools
Tools Description avocado Avocado is a next generation testing framework inspired by Autotest ...
esp8266
Blink Sketch on ESP8266
Making blink LED working with Arduino on ESP8266 is incredibly easy, with just a few clicks, of course you need to install Arduino IDE first, download the la...
Run MicroPython on ESP8266
MicroPython is a python implementation aimed to be running on MCUs such as ESP8266/ESP32, stm32 etc, all the ports can be found here, the following will only...
Build NodeMCU Firmware for ESP8266
NodeMCU is one of the most popular firmware for ESP8266 and ESP32 wifi SoCs, the firmware is written in c and has Lua interpreter builtin which is based on L...
Wireless debugging with esplink
Serial console is always an very important tool when doing low level development such as kernel or bootloader, the most commonly used are the USB to serial c...
Smart Home: Control Android TV with esphome and androidtv
For a very long time, I want to setup an system that can turn on the TV every morning when I get up and play some video files for English learning, I know I ...
gdb
Bring Latest Linux Kernel to MINI2440
Poring Linux kernel to board is much easier than the age of version 2.6, I want to make an update my school projects, part of this procedure involves the ker...
Learning Resources
This is a list of resources I used for expanding my knowledge on U-Boot, kernel and other stuff related embedded system.
Debugging Mini2440 with OpenOCD
Bring board up for the first time, it usually involves debugging with JTAG, in this post I will be using OpenJTAG for mini2440, showing how to load program w...
gdb cheatsheet
breakpoint
Kernel Debugging With Kgdb
In Kernel memory debugging techniques, we talked about using script decode_stacktrace.sh to translate addresses to lines, or if only interested in one entry ...
kernel
Learning Resources
This is a list of resources I used for expanding my knowledge on U-Boot, kernel and other stuff related embedded system.
Debugging kernel with dynamic debug
Dynamic debug is a great feature for kernel debugging, kernel must be compiled with CONFIG_DYNAMIC_DEBUG option, if it was enabled, all pr_debug(), dev_dbg()...
Raspberry pi 3B+ arm64 kernel boot message
rpi3:/ # dmesg [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.14.129-v8+ (fdbai@fdbai-desktop) (gcc version 5.4.0 20160609 (...
Build kernel image for Raspberry Pi 3B
Download source code git clone --depth=1 https://github.com/raspberrypi/linux.git
performance
Reading Notes on BPF Performance Tools
Ch 1 Introduction Ch 2 Technology Background Ch 3 Performance Analysis Ch 4 BCC Ch 5 bpftrace Ch 6 CPUs Ch 7 Memory Ch 8 File Systems Ch 9...
Reading Notes on Systems Performance
Ch 1 Introduction Ch 2 Methodology Ch 3 Operating Systems Ch 4 Observability Tools Ch 5 Applications Ch 6 CPUs Ch 7 Memory Ch 8 File Systems...
Analyzing Android with Battery Historian
Battery Historian is a tool for inspecting battery related issues, it works on android 5.0 and above, this can also be used for analyzing performance since b...
Analyzing Android Boot Time with Bootchart and Systrace
Introduction Bootchart is a great tool for performance analysis and visualization of the Linux/Android boot process, it consists of two parts: data collectio...
memory
U-Boot: Understanding lowlevel_init
MINI2440 has two SDRAM chips on board, different version have different chipset, my SDRAM is EM63A165TS-6G from EtronTech, the pin and timing is compatible w...
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
Android native memory debugging
malloc_debug
Limiting resource usage with cgroups on Android
cgroups on Android cgroups(control groups for short) was created by Google engineers, and was merged into the mainline at 2008 in version 2.6.24, it was main...
phicomm
Smart Home: Install Home Assistant on Docker
This is a quick setup of home assistant with docker compose.
Install Pi-hole with Docker on Phicomm N1
Install required packages ```bash $ sudo apt install docker.io -y $ sudo apt install docker-compose -y $ sudo apt install lighttpd -y
Play Armbian OS with Phicomm Box
Armbian is an operation system based on Debian and Ubuntu, created for ARM-based development boards, it also supports a wide variety of TV boxes, and a lot o...
Phicomm R1 Smart Speaker Revived
Wireless Configuration Most smart devices such as speakers, sockets, air conditioners are headless embedded devices, these devices need to be connected to th...
panic
Bring Latest Linux Kernel to MINI2440
Poring Linux kernel to board is much easier than the age of version 2.6, I want to make an update my school projects, part of this procedure involves the ker...
Enable pstore for kernel oops/panic dumping
Debugging devices without serial console is big challenge especially for kernel panic issues, pstore (persistent store) writes kernel messages before system ...
What Does Tainted Flags Mean in Oops Messages
[ 81.890105] CPU: 3 PID: 890 Comm: insmod Tainted: G O 4.19.108-v8+ #1
Kernel Debugging With Kgdb
In Kernel memory debugging techniques, we talked about using script decode_stacktrace.sh to translate addresses to lines, or if only interested in one entry ...
dumpsys
Track down the source of android toast
There are many ways to tell which app sends a toast, the most quickest way is to install third-party app such as Toast Source or Toaster, if you don’t want t...
What I’ve learned from wa output
Workload-automation is a great tool for benchmark automation, it utilizes tools in sdk and android system, including aapt, pm, am etc through devlib, this po...
Android cheatsheet
dumpsys
vim
Taking Notes with Vim
I’ve been using Joplin for about 3 months, I love it, than any other note taking apps. Everything works fine until this Tuesday afternoon (around 3:20 PM to ...
Turn vim into an IDE with spf13-vim
I’ve been using vim for a very long time, my vimrc file is based on Amix’s with minor modifications, I think it’s time to move forward embracing excellent pr...
Vim tips from zzapper
Best of Vim Tips zzapper 16 Years of Vi + 10+ years of Vim and still learning 31Aug18 : Last Update (Now in VIM Help Format :h helptags) ###These Tips are no...
tips
Markdown Cheatsheet
Preserve white spaces In macOS, you need to press⌥ Opt+Space
Random Kernel Debugging Tips
All-zero address shown when do cat /proc/modules echo 0 > /proc/sys/kernel/kptr_restrict # or with sysctl sysctl kernel.kptr_restrict=0
Vim tips from zzapper
Best of Vim Tips zzapper 16 Years of Vi + 10+ years of Vim and still learning 31Aug18 : Last Update (Now in VIM Help Format :h helptags) ###These Tips are no...
ftrace
Find Out Who Deleted a File
Previously I wrote a post about how to use ftrace via trace-cmd, now here comes a real world example showing how to find who deleted a file in Android system.
An introduction to android systrace
what is systrace
Tracing kernel using ftrace
Ftrace
router
Build Home Router with OpenWrt – Add Web Interface
Luci is the default web interface for managing openwrt base home routers, integrate luci with the following patch: diff --git a/target/linux/brcm2708/configs...
Build Home Router with OpenWrt – Setup Wireless
Wireless Setup
Build Home Router with OpenWrt – Works as a Router
In the previous post, We run openwrt image on Raspberry Pi 3B, but that is only bring openwrt up, it is not a router.
ubuntu
Setup Build Environment with Vagrant
As a system engineer, I have to manage various build envrionmets, build all the projects against one Ubuntu version became imposssible, one change for one pr...
An Introduction to Local Development with Docker Container
Previously I wrote a post about how to setup TV box as a development machine, I cannot take a box everywhere I go, because it is not that convenient to find ...
Using Gerrit on Ubuntu
Install Gerrit First download the latest version of gerrit from Gerrit Releases site:
alias
fzf reports ‘parse error near `done’
This is a long last issue that happens every time I open a new tab or open iTerm, I thought it was a issue of fzf, and it is not, actually, because reinstall...
Fix a Build Breakage on Inline Function
I’ve done a lot of work on u-boot-2010.09 for MINI2440 to make development process more comfortable, unfortunately, the archived u-boot images were deleted b...
Using Git Like a Pro – aliases
Aliases are created through the use of the git config command, and will be saved to $HOME/.gitconfig, use below two commands to see a list of aliases:
rpi3b
Running LineageOS 16 on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
Running LineageOS on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
Running Android Oreo on Raspberry Pi 3B
Setup Build Environment (Ubuntu 16.04)
sanitizer
Syzkaller: Coverage-guided Kernel Fuzzer
Syzkaller is a coverage-guided fuzzer for Linux kernel, it was mainly developed by Dmitry Vyukov, and with many other developers, it’s under active developme...
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
Android native memory debugging
malloc_debug
ssh
Share adb device with another computer
Android adb device was attached to laptop(C1) running Ubuntu, the other computer also with Ubuntu installed, we call it C2.
Connect to Home Computer over SSH through Cloudflare
I need to work on my personal projects outside sometimes, when I need to access to my home computer I use RustDesk, but the key map for Ubuntu and macOS are ...
Smart Home: Getting Started with Home Assistant on Raspberry Pi
Various types of smart devices designed for smart home are developed, part of them can be connected to apple HomeKit, or connected to vendor’s ECO-system, th...
oops
Enable pstore for kernel oops/panic dumping
Debugging devices without serial console is big challenge especially for kernel panic issues, pstore (persistent store) writes kernel messages before system ...
What Does Tainted Flags Mean in Oops Messages
[ 81.890105] CPU: 3 PID: 890 Comm: insmod Tainted: G O 4.19.108-v8+ #1
Kernel Debugging With Kgdb
In Kernel memory debugging techniques, we talked about using script decode_stacktrace.sh to translate addresses to lines, or if only interested in one entry ...
native
Sentry Native for MIPS Linux
Prerequisite
Linux C Crash Reporting with Sentry
Preparation
A List of Common Reasons for Segmentation Faults
Segment fault are common issues for native developers, it is caused by accessing memory location that is not allowed to, I’m gonna list the possible reasons ...
crash
Sentry Native for MIPS Linux
Prerequisite
Linux C Crash Reporting with Sentry
Preparation
A List of Common Reasons for Segmentation Faults
Segment fault are common issues for native developers, it is caused by accessing memory location that is not allowed to, I’m gonna list the possible reasons ...
poky
Test Linux on ROC-RK3328-CC with LTP
Cross compile ltp
Yocto for Firefly ROC-RK3328-CC
Add machine roc-rk3328-cc
Build Embedded Linux System with Yocto Project
Prepare for build yocto project
frp
Make Selfhosted Services Public
If you are hosting services at home and want to be accessed from outside, there are couple of options: Cloudflare Tunnel frp nps ngrok
Build Famliy Album with PhotoPrism
After I uploaded my photos to nextcloud, I realized, nextcloud is probably not a good choice for hosting photos, so this time I try to manage these photos wi...
NextCloud with Docker
Previously I deployed a nextcloud container in digitalocean droplet for my note synchronization. This time I want use nextcloud to hold all my documents and ...
cloudflare
Calibre Powered Online Book Store
Generate Calibre Database
Make Selfhosted Services Public
If you are hosting services at home and want to be accessed from outside, there are couple of options: Cloudflare Tunnel frp nps ngrok
Connect to Home Computer over SSH through Cloudflare
I need to work on my personal projects outside sometimes, when I need to access to my home computer I use RustDesk, but the key map for Ubuntu and macOS are ...
tunnel
Calibre Powered Online Book Store
Generate Calibre Database
Make Selfhosted Services Public
If you are hosting services at home and want to be accessed from outside, there are couple of options: Cloudflare Tunnel frp nps ngrok
Connect to Home Computer over SSH through Cloudflare
I need to work on my personal projects outside sometimes, when I need to access to my home computer I use RustDesk, but the key map for Ubuntu and macOS are ...
shell
Linux Command Cheat Sheet
Basic ```shell find files created today find . -type f -daystart -ctime -1
import code to empty git repo
I am planning to make android pie runnning on our latest proudct, Continuous Integration team has initialized all the git project, inside citrix, but there i...
trace-cmd
Find Out Who Deleted a File
Previously I wrote a post about how to use ftrace via trace-cmd, now here comes a real world example showing how to find who deleted a file in Android system.
Tracing kernel using ftrace
Ftrace
systrace
Analyzing Android Boot Time with Bootchart and Systrace
Introduction Bootchart is a great tool for performance analysis and visualization of the Linux/Android boot process, it consists of two parts: data collectio...
An introduction to android systrace
what is systrace
profiling
Android performance profiling tool - simpleperf
Introduction simpleperf is a native performance profiling tool for Android, like the name indicated, simpleperf is a simplified version of linux-tools-perf w...
script
Execute Shell Script on Boot
I have built a rootfs with buildroot, rootfs is squashfs with overlayfs support for ease of writting configuration files such as dropbear that needs write pe...
Linux Command Cheat Sheet
Basic ```shell find files created today find . -type f -daystart -ctime -1
wa
What I’ve learned from wa output
Workload-automation is a great tool for benchmark automation, it utilizes tools in sdk and android system, including aapt, pm, am etc through devlib, this po...
raspberry
Build Home Router with OpenWrt – Works as a Router
In the previous post, We run openwrt image on Raspberry Pi 3B, but that is only bring openwrt up, it is not a router.
Running OpenWrt on Raspberry Pi 3
Checking out OpenWrt code git clone https://www.github.com/openwrt/openwrt
dnsmasq
Internet Connection Sharing with Armbian
I need to work while travelling in the following couple of months, so I need all my devices connected to the internet, N1 has a Ethernet port and wireless mo...
Build Home Router with OpenWrt – Add adblock
Add required packages make menuconfig Network » adblock Network » tcpdump LuCI » 3. Applications » luci-app-adblock
shadowsocks
Build Home Router with OpenWrt – Setup SS Server
Ubuntu 16.04 Shadowsocks 2.8.2 Python 2.7.15rc1
Build Home Router with OpenWrt – Add shadowsocks
Add related packages
ss
Build Home Router with OpenWrt – Setup SS Server
Ubuntu 16.04 Shadowsocks 2.8.2 Python 2.7.15rc1
Build Home Router with OpenWrt – Add shadowsocks
Add related packages
v2ray
Setup Development Environment on Phicomm T1
Basic Setup
Bypass Censorship with v2ray
Server side of v2ray
gerrit
Using Gerrit on Ubuntu
Install Gerrit First download the latest version of gerrit from Gerrit Releases site:
Shell - batch revert and push to gerrit
This post illustrates how to revert a commit in many branches, say 100 for example, and then push to gerrit server with reviewers added.
lineageos
Running LineageOS 16 on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
Running LineageOS on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
lineage
Running LineageOS 16 on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
Running LineageOS on Raspberry Pi 3B
Setup Build Environment Follow instructions in Running Android Oreo on Raspberry Pi 3B to setup build environment under Ubuntu.
boot
Execute Shell Script on Boot
I have built a rootfs with buildroot, rootfs is squashfs with overlayfs support for ease of writting configuration files such as dropbear that needs write pe...
Raspberry pi 3B+ arm64 kernel boot message
rpi3:/ # dmesg [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.14.129-v8+ (fdbai@fdbai-desktop) (gcc version 5.4.0 20160609 (...
ebpf
Phicomm N1 Box High CPU Usage Due to IRQ-42
While playing Armbian with Phicomm N1 box, I found kernel thread irq/42-0.200908 have very high cpu usage thus cause the load average to around 2, this is a ...
Android performance monitoring with bcc
Build kernel with bpf support In order to use bpf, kernel should be at least build with these options: +CONFIG_BPF=y +CONFIG_BPF_SYSCALL=y +CONFIG_BPF_EVENTS...
spf13
Setup Development Environment on Phicomm T1
Basic Setup
Turn vim into an IDE with spf13-vim
I’ve been using vim for a very long time, my vimrc file is based on Amix’s with minor modifications, I think it’s time to move forward embracing excellent pr...
sysrq
Phicomm N1 Box High CPU Usage Due to IRQ-42
While playing Armbian with Phicomm N1 box, I found kernel thread irq/42-0.200908 have very high cpu usage thus cause the load average to around 2, this is a ...
Android procfs demystified – sysrq-trigger
The magic SysRq key is a key combination(Alt+SysRq+<cmd>) implemented by linux kernel, it is usually used to get more information for further investiga...
nodemcu
Build NodeMCU Firmware for ESP8266
NodeMCU is one of the most popular firmware for ESP8266 and ESP32 wifi SoCs, the firmware is written in c and has Lua interpreter builtin which is based on L...
Smart Home: Control Android TV with esphome and androidtv
For a very long time, I want to setup an system that can turn on the TV every morning when I get up and play some video files for English learning, I know I ...
adb
Share adb device with another computer
Android adb device was attached to laptop(C1) running Ubuntu, the other computer also with Ubuntu installed, we call it C2.
Smart Home: Control Android TV with esphome and androidtv
For a very long time, I want to setup an system that can turn on the TV every morning when I get up and play some video files for English learning, I know I ...
syzkaller
Setup Development Environment on Phicomm T1
Basic Setup
Syzkaller: Coverage-guided Kernel Fuzzer
Syzkaller is a coverage-guided fuzzer for Linux kernel, it was mainly developed by Dmitry Vyukov, and with many other developers, it’s under active developme...
fzf
fzf reports ‘parse error near `done’
This is a long last issue that happens every time I open a new tab or open iTerm, I thought it was a issue of fzf, and it is not, actually, because reinstall...
Setup Development Environment on Phicomm T1
Basic Setup
gitlab
gitlab server with docker-compose
Install gitlab with docker-compose
Remove Git Commit from History
Occasionally, you may want to remove a commit from github/gitlab, for example, I pushed a commit to switched the jekyll theme from minima to minimal mistakes...
OpenOCD
Turn Your Raspberry Pi into a JTAG Adapter
I have several Raspberry Pis in hand, they are all not being used for a very long time because of the poor performance of the MMC controller, but it doesn’t ...
Debugging Mini2440 with OpenOCD
Bring board up for the first time, it usually involves debugging with JTAG, in this post I will be using OpenJTAG for mini2440, showing how to load program w...
bootloader
U-Boot: Understanding lowlevel_init
MINI2440 has two SDRAM chips on board, different version have different chipset, my SDRAM is EM63A165TS-6G from EtronTech, the pin and timing is compatible w...
U-Boot: Understanding Start.S
U-Boot is a universal bootloader for many architectures, the U-Boot image build against current version (u-boot-2020.10) cannot fit the size of stepping zone...
U-Boot
Curated List of Reasons for Boards Stuck on “Starting kernel …”
Machine id mismatch
Learning Resources
This is a list of resources I used for expanding my knowledge on U-Boot, kernel and other stuff related embedded system.
JTAG
New Year’s Resolution - 2021
Wireless to UART Bridge
Turn Your Raspberry Pi into a JTAG Adapter
I have several Raspberry Pis in hand, they are all not being used for a very long time because of the poor performance of the MMC controller, but it doesn’t ...
reboot
Execute Shell Script on Boot
I have built a rootfs with buildroot, rootfs is squashfs with overlayfs support for ease of writting configuration files such as dropbear that needs write pe...
Reboot Android Device without Using reboot Command
When I am writing plugin for workload automation, I met a issue that execution will fail when I want to enter android recovery mode with: self.target.execute...
note-taking
Taking Notes with Vim
I’ve been using Joplin for about 3 months, I love it, than any other note taking apps. Everything works fine until this Tuesday afternoon (around 3:20 PM to ...
Joplin: My New Note-taking Solution
Update: I switched to vim+git for note-taking this week because Joplin deleted a lot of my notes by accident, I put this post here for reference only, I m...
kirkstone
Yocto for Firefly ROC-RK3328-CC
Add machine roc-rk3328-cc
Build Embedded Linux System with Yocto Project
Prepare for build yocto project
sdk
Yocto for Firefly ROC-RK3328-CC
Add machine roc-rk3328-cc
Build Embedded Linux System with Yocto Project
Prepare for build yocto project
buildroot
Run clang 15 executable on legacy device
For a suspected memory leak issue on a legacy device running OpenWrt build with gcc-8, I need a toolchain with leak sanitizer support, so I try to generate o...
Build Toolchain for MIPS
There are many ways to create a toolchain, the most easiest way to do this might be with buildroot, always grab the latest long term support release from off...
mips
Memo for Cross Compile
vmstat
Build Toolchain for MIPS
There are many ways to create a toolchain, the most easiest way to do this might be with buildroot, always grab the latest long term support release from off...
rk3328
Test Linux on ROC-RK3328-CC with LTP
Cross compile ltp
Yocto for Firefly ROC-RK3328-CC
Add machine roc-rk3328-cc
toolchain
Run clang 15 executable on legacy device
For a suspected memory leak issue on a legacy device running OpenWrt build with gcc-8, I need a toolchain with leak sanitizer support, so I try to generate o...
Create Toolchain with Crosstool-NG
Preparation sudo apt install -y flex help2man libtool-bin bison libncurses5-dev wget -c http://crosstool-ng.org/download/crosstool-ng/crosstool-ng-1.26.0.tar...
crashpad
Sentry Native for MIPS Linux
Prerequisite
Linux C Crash Reporting with Sentry
Preparation
sentry
Sentry Native for MIPS Linux
Prerequisite
Linux C Crash Reporting with Sentry
Preparation
perfetto
Linux Auto test with Linaro Test-definition
Prepare Test Environment Ubuntu 22.04
Linux Tracing with Perfetto
Build perfetto git clone https://github.com/google/perfetto -b v43.1 git clone https://android.googlesource.com/platform/external/perfetto/ && cd per...
trace
Linux Auto test with Linaro Test-definition
Prepare Test Environment Ubuntu 22.04
Linux Tracing with Perfetto
Build perfetto git clone https://github.com/google/perfetto -b v43.1 git clone https://android.googlesource.com/platform/external/perfetto/ && cd per...
Jekyll
Create new post with jekyll-compose
Installation
post
Create new post with jekyll-compose
Installation
technology
Awesome websites
Technology News
blog
Awesome websites
Technology News
matplotlib
Back to top ↑stacked
Back to top ↑macos
Setup Android Development Environment on MacOS
Install Java
android
Setup Android Development Environment on MacOS
Install Java
zram
Enable zram on Android
What is zram Kernel Documentation says it is Compressed RAM based block devices.
tools
open source perf tools
Tools Description avocado Avocado is a next generation testing framework inspired by Autotest ...
kernelshark
Tracing kernel using ftrace
Ftrace
simpleperf
Android performance profiling tool - simpleperf
Introduction simpleperf is a native performance profiling tool for Android, like the name indicated, simpleperf is a simplified version of linux-tools-perf w...
services
Must have cool online services
Cool online services
analyzer
Must have cool online services
Cool online services
workload-automation
Back to top ↑bootchart
Analyzing Android Boot Time with Bootchart and Systrace
Introduction Bootchart is a great tool for performance analysis and visualization of the Linux/Android boot process, it consists of two parts: data collectio...
bootup
Running OpenWrt on Raspberry Pi 3
Checking out OpenWrt code git clone https://www.github.com/openwrt/openwrt
wireless
Build Home Router with OpenWrt – Setup Wireless
Wireless Setup
luci
Build Home Router with OpenWrt – Add Web Interface
Luci is the default web interface for managing openwrt base home routers, integrate luci with the following patch: diff --git a/target/linux/brcm2708/configs...
usb
Build Home Router with OpenWrt – USB Storage Auto Mount
Block mount Add CONFIG_PACKAGE_block-mount=y to target/linux/brcm2708/configs/rpi3b_defconfig to get block mount support
automount
Build Home Router with OpenWrt – USB Storage Auto Mount
Block mount Add CONFIG_PACKAGE_block-mount=y to target/linux/brcm2708/configs/rpi3b_defconfig to get block mount support
minidlna
Build Home Router with OpenWrt – Add miniDLNA
Add miniDLNA related packages
mediaserver
Build Home Router with OpenWrt – Add miniDLNA
Add miniDLNA related packages
aria2
Build Home Router with OpenWrt – Add aira2
Add packages make menuconfig Network » File Transfer » aria2 Network » Download Manager » webui-aria2 LuCI » 3. Applications » luci-app-aria2
download
Build Home Router with OpenWrt – Add aira2
Add packages make menuconfig Network » File Transfer » aria2 Network » Download Manager » webui-aria2 LuCI » 3. Applications » luci-app-aria2
adblock
Build Home Router with OpenWrt – Add adblock
Add required packages make menuconfig Network » adblock Network » tcpdump LuCI » 3. Applications » luci-app-adblock
ss-redir
Build Home Router with OpenWrt – Add shadowsocks
Add related packages
ss-rules
Build Home Router with OpenWrt – Add shadowsocks
Add related packages
tproxy
Build Home Router with OpenWrt – Add shadowsocks
Add related packages
ssserver
Build Home Router with OpenWrt – Setup SS Server
Ubuntu 16.04 Shadowsocks 2.8.2 Python 2.7.15rc1
revert
Shell - batch revert and push to gerrit
This post illustrates how to revert a commit in many branches, say 100 for example, and then push to gerrit server with reviewers added.
split
How to split subdirectory into a separate git repository
In this post, I’ll show you how to split tools/perf in linux tree into an separate git repository without losing the commit history.
subdirectory
How to split subdirectory into a separate git repository
In this post, I’ll show you how to split tools/perf in linux tree into an separate git repository without losing the commit history.
subtree
How to split subdirectory into a separate git repository
In this post, I’ll show you how to split tools/perf in linux tree into an separate git repository without losing the commit history.
callgraph
Generate Call & Caller Graphs with Doxygen
Installation Doxygen using dot from graphviz to generate graphs, install doxygen and its dependency: sudo apt install doxygen -y sudo apt-get install graphvi...
graphviz
Generate Call & Caller Graphs with Doxygen
Installation Doxygen using dot from graphviz to generate graphs, install doxygen and its dependency: sudo apt install doxygen -y sudo apt-get install graphvi...
dot
Generate Call & Caller Graphs with Doxygen
Installation Doxygen using dot from graphviz to generate graphs, install doxygen and its dependency: sudo apt install doxygen -y sudo apt-get install graphvi...
doxygen
Generate Call & Caller Graphs with Doxygen
Installation Doxygen using dot from graphviz to generate graphs, install doxygen and its dependency: sudo apt install doxygen -y sudo apt-get install graphvi...
lmkd
Generate Call & Caller Graphs with Doxygen
Installation Doxygen using dot from graphviz to generate graphs, install doxygen and its dependency: sudo apt install doxygen -y sudo apt-get install graphvi...
delete
Find Out Who Deleted a File
Previously I wrote a post about how to use ftrace via trace-cmd, now here comes a real world example showing how to find who deleted a file in Android system.
unlink
Find Out Who Deleted a File
Previously I wrote a post about how to use ftrace via trace-cmd, now here comes a real world example showing how to find who deleted a file in Android system.
inode
Find Out Who Deleted a File
Previously I wrote a post about how to use ftrace via trace-cmd, now here comes a real world example showing how to find who deleted a file in Android system.
oreo
Running Android Oreo on Raspberry Pi 3B
Setup Build Environment (Ubuntu 16.04)
scripts
How to Debug Shell Scripts
In order to find out where the problem is with my script, I often use echo for debugging, print line number with echo ${LINENO}, but it is not a optimium way...
make
How to do make debugging
Verbose output
dryrun
How to do make debugging
Verbose output
aapt
What I’ve learned from wa output
Workload-automation is a great tool for benchmark automation, it utilizes tools in sdk and android system, including aapt, pm, am etc through devlib, this po...
pm
What I’ve learned from wa output
Workload-automation is a great tool for benchmark automation, it utilizes tools in sdk and android system, including aapt, pm, am etc through devlib, this po...
am
What I’ve learned from wa output
Workload-automation is a great tool for benchmark automation, it utilizes tools in sdk and android system, including aapt, pm, am etc through devlib, this po...
settings
What I’ve learned from wa output
Workload-automation is a great tool for benchmark automation, it utilizes tools in sdk and android system, including aapt, pm, am etc through devlib, this po...
cmd
What I’ve learned from wa output
Workload-automation is a great tool for benchmark automation, it utilizes tools in sdk and android system, including aapt, pm, am etc through devlib, this po...
ftp
Automate FTP transfer with shell script
Android build process takes a very long time, especially on low end computers, after build complete, I wanna transfer the final image to ftp server for furth...
netrc
Automate FTP transfer with shell script
Android build process takes a very long time, especially on low end computers, after build complete, I wanna transfer the final image to ftp server for furth...
curl
Automate FTP transfer with shell script
Android build process takes a very long time, especially on low end computers, after build complete, I wanna transfer the final image to ftp server for furth...
automate
Automate FTP transfer with shell script
Android build process takes a very long time, especially on low end computers, after build complete, I wanna transfer the final image to ftp server for furth...
cgroups
Limiting resource usage with cgroups on Android
cgroups on Android cgroups(control groups for short) was created by Google engineers, and was merged into the mainline at 2008 in version 2.6.24, it was main...
resource
Limiting resource usage with cgroups on Android
cgroups on Android cgroups(control groups for short) was created by Google engineers, and was merged into the mainline at 2008 in version 2.6.24, it was main...
cpuset
Limiting resource usage with cgroups on Android
cgroups on Android cgroups(control groups for short) was created by Google engineers, and was merged into the mainline at 2008 in version 2.6.24, it was main...
memcg
Limiting resource usage with cgroups on Android
cgroups on Android cgroups(control groups for short) was created by Google engineers, and was merged into the mainline at 2008 in version 2.6.24, it was main...
stress
Limiting resource usage with cgroups on Android
cgroups on Android cgroups(control groups for short) was created by Google engineers, and was merged into the mainline at 2008 in version 2.6.24, it was main...
malloc
Android native memory debugging
malloc_debug
valgrind
Android native memory debugging
malloc_debug
asan
Android native memory debugging
malloc_debug
array
Learning Linux Shell
Check if a direcotry exists
64bit
Raspberry pi 3B+ arm64 kernel boot message
rpi3:/ # dmesg [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.14.129-v8+ (fdbai@fdbai-desktop) (gcc version 5.4.0 20160609 (...
dmesg
Raspberry pi 3B+ arm64 kernel boot message
rpi3:/ # dmesg [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.14.129-v8+ (fdbai@fdbai-desktop) (gcc version 5.4.0 20160609 (...
kmemleak
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
kasan
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
ubsan
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
kcov
Kernel memory debugging techniques
Linux kernel has many memory related debug tools to help kernel developers find out memory related issues, these tools are included in upstream kernel: Ke...
crontab
Scheduling task with crontab
I think schduling a job with crontab should be easy for me, as I am a veteran linux user, the truth is I don’t know crontab, totally.
task
Scheduling task with crontab
I think schduling a job with crontab should be easy for me, as I am a veteran linux user, the truth is I don’t know crontab, totally.
scheduling
Scheduling task with crontab
I think schduling a job with crontab should be easy for me, as I am a veteran linux user, the truth is I don’t know crontab, totally.
bcc
Android performance monitoring with bcc
Build kernel with bpf support In order to use bpf, kernel should be at least build with these options: +CONFIG_BPF=y +CONFIG_BPF_SYSCALL=y +CONFIG_BPF_EVENTS...
bpftrace
Android performance monitoring with bcc
Build kernel with bpf support In order to use bpf, kernel should be at least build with these options: +CONFIG_BPF=y +CONFIG_BPF_SYSCALL=y +CONFIG_BPF_EVENTS...
adeb
Android performance monitoring with bcc
Build kernel with bpf support In order to use bpf, kernel should be at least build with these options: +CONFIG_BPF=y +CONFIG_BPF_SYSCALL=y +CONFIG_BPF_EVENTS...
build
The differences between android build variants
item/flavor eng user userdebug ro.secure 0 1 1 security.perf_harden ...
variants
The differences between android build variants
item/flavor eng user userdebug ro.secure 0 1 1 security.perf_harden ...
user
The differences between android build variants
item/flavor eng user userdebug ro.secure 0 1 1 security.perf_harden ...
userdebug
The differences between android build variants
item/flavor eng user userdebug ro.secure 0 1 1 security.perf_harden ...
screen
Control your Android devices with scrcpy
scrcpy is an open source project developed by Genymobile, it can be used to display and control of your android devices over adb connection. The following fe...
scrcpy
Control your Android devices with scrcpy
scrcpy is an open source project developed by Genymobile, it can be used to display and control of your android devices over adb connection. The following fe...
display
Control your Android devices with scrcpy
scrcpy is an open source project developed by Genymobile, it can be used to display and control of your android devices over adb connection. The following fe...
apt
Fix apt autoremove report Unmet dependencies
After upgrading my computer to Ubuntu 18.04, I wanna remove unused packages, so I do an apt autoremove, unfortunately it failed with below messages: sudo apt...
unmet
Fix apt autoremove report Unmet dependencies
After upgrading my computer to Ubuntu 18.04, I wanna remove unused packages, so I do an apt autoremove, unfortunately it failed with below messages: sudo apt...
dependencies
Fix apt autoremove report Unmet dependencies
After upgrading my computer to Ubuntu 18.04, I wanna remove unused packages, so I do an apt autoremove, unfortunately it failed with below messages: sudo apt...
thefuck
Correct misspelled commands with thefuck
No one can guarantee that he never make mistakes while using command line, even an experienced user.
correct
Correct misspelled commands with thefuck
No one can guarantee that he never make mistakes while using command line, even an experienced user.
wrong
Correct misspelled commands with thefuck
No one can guarantee that he never make mistakes while using command line, even an experienced user.
Vundle
Turn vim into an IDE with spf13-vim
I’ve been using vim for a very long time, my vimrc file is based on Amix’s with minor modifications, I think it’s time to move forward embracing excellent pr...
magic
Android procfs demystified – sysrq-trigger
The magic SysRq key is a key combination(Alt+SysRq+<cmd>) implemented by linux kernel, it is usually used to get more information for further investiga...
dynamic
Debugging kernel with dynamic debug
Dynamic debug is a great feature for kernel debugging, kernel must be compiled with CONFIG_DYNAMIC_DEBUG option, if it was enabled, all pr_debug(), dev_dbg()...
battery
Analyzing Android with Battery Historian
Battery Historian is a tool for inspecting battery related issues, it works on android 5.0 and above, this can also be used for analyzing performance since b...
historian
Analyzing Android with Battery Historian
Battery Historian is a tool for inspecting battery related issues, it works on android 5.0 and above, this can also be used for analyzing performance since b...
system
Analyzing Android with Battery Historian
Battery Historian is a tool for inspecting battery related issues, it works on android 5.0 and above, this can also be used for analyzing performance since b...
procfs
Android procfs demystified – cpuinfo
From cpuinfo in procfs, we get a lot information about the cpu on board, how many cores, architecture etc, here is an example output of cpuinfo of RPI 3B+: `...
cpuinfo
Android procfs demystified – cpuinfo
From cpuinfo in procfs, we get a lot information about the cpu on board, how many cores, architecture etc, here is an example output of cpuinfo of RPI 3B+: `...
toast
Track down the source of android toast
There are many ways to tell which app sends a toast, the most quickest way is to install third-party app such as Toast Source or Toaster, if you don’t want t...
tuning
Back to top ↑guide
Back to top ↑opengl
Back to top ↑render
Back to top ↑dalvik
Back to top ↑apk
Back to top ↑hassos
Smart Home: Getting Started with Home Assistant on Raspberry Pi
Various types of smart devices designed for smart home are developed, part of them can be connected to apple HomeKit, or connected to vendor’s ECO-system, th...
smarthome
Smart Home: Getting Started with Home Assistant on Raspberry Pi
Various types of smart devices designed for smart home are developed, part of them can be connected to apple HomeKit, or connected to vendor’s ECO-system, th...
addon
Smart Home: Getting Started with Home Assistant on Raspberry Pi
Various types of smart devices designed for smart home are developed, part of them can be connected to apple HomeKit, or connected to vendor’s ECO-system, th...
ipcam
Smart Home: Motion Detection with Android IP Webcam
Home security is always the most import part for smart home system, in this blog post, I will show you how to turn an old android phone into a webcam, and wi...
webcam
Smart Home: Motion Detection with Android IP Webcam
Home security is always the most import part for smart home system, in this blog post, I will show you how to turn an old android phone into a webcam, and wi...
motion
Smart Home: Motion Detection with Android IP Webcam
Home security is always the most import part for smart home system, in this blog post, I will show you how to turn an old android phone into a webcam, and wi...
motioneye
Smart Home: Motion Detection with Android IP Webcam
Home security is always the most import part for smart home system, in this blog post, I will show you how to turn an old android phone into a webcam, and wi...
ffmepg
Smart Home: Motion Detection with Android IP Webcam
Home security is always the most import part for smart home system, in this blog post, I will show you how to turn an old android phone into a webcam, and wi...
esphome
Smart Home: Control Android TV with esphome and androidtv
For a very long time, I want to setup an system that can turn on the TV every morning when I get up and play some video files for English learning, I know I ...
ir
Smart Home: Control Android TV with esphome and androidtv
For a very long time, I want to setup an system that can turn on the TV every morning when I get up and play some video files for English learning, I know I ...
androidtv
Smart Home: Control Android TV with esphome and androidtv
For a very long time, I want to setup an system that can turn on the TV every morning when I get up and play some video files for English learning, I know I ...
vlc
Smart Home: Control Android TV with esphome and androidtv
For a very long time, I want to setup an system that can turn on the TV every morning when I get up and play some video files for English learning, I know I ...
ad
Back to top ↑block
Back to top ↑pi-hole
Back to top ↑headless
Back to top ↑dns
Back to top ↑sinkhole
Back to top ↑speaker
Phicomm R1 Smart Speaker Revived
Wireless Configuration Most smart devices such as speakers, sockets, air conditioners are headless embedded devices, these devices need to be connected to th...
airplay
Phicomm R1 Smart Speaker Revived
Wireless Configuration Most smart devices such as speakers, sockets, air conditioners are headless embedded devices, these devices need to be connected to th...
smart-config
Phicomm R1 Smart Speaker Revived
Wireless Configuration Most smart devices such as speakers, sockets, air conditioners are headless embedded devices, these devices need to be connected to th...
jadx
Phicomm R1 Smart Speaker Revived
Wireless Configuration Most smart devices such as speakers, sockets, air conditioners are headless embedded devices, these devices need to be connected to th...
github
A Proxy to Make Github Access Fly
It is well known that, accessing github in China is a torture, cloning a github repository takes too much time, especially for big project like linux kernel,...
speed
A Proxy to Make Github Access Fly
It is well known that, accessing github in China is a torture, cloning a github repository takes too much time, especially for big project like linux kernel,...
proxy
A Proxy to Make Github Access Fly
It is well known that, accessing github in China is a torture, cloning a github repository takes too much time, especially for big project like linux kernel,...
clone
A Proxy to Make Github Access Fly
It is well known that, accessing github in China is a torture, cloning a github repository takes too much time, especially for big project like linux kernel,...
Armbian
Play Armbian OS with Phicomm Box
Armbian is an operation system based on Debian and Ubuntu, created for ARM-based development boards, it also supports a wide variety of TV boxes, and a lot o...
N1
Play Armbian OS with Phicomm Box
Armbian is an operation system based on Debian and Ubuntu, created for ARM-based development boards, it also supports a wide variety of TV boxes, and a lot o...
T1
Play Armbian OS with Phicomm Box
Armbian is an operation system based on Debian and Ubuntu, created for ARM-based development boards, it also supports a wide variety of TV boxes, and a lot o...
jieba
Highlight Job Description Keywords with WordCloud
Visual images are always more attractive than pure numbers or statistics, that’s why WordCloud are so popular, I am considering look for a new job, and gathe...
job
Highlight Job Description Keywords with WordCloud
Visual images are always more attractive than pure numbers or statistics, that’s why WordCloud are so popular, I am considering look for a new job, and gathe...
macos tips
Random MacOS Tips
Disable subtitles in VLC by default Go to VLC ➜ Preferences ➜ Subtitles / OSD, enter none in the text box labeled Preferred subtitle language, this works fo...
kdb
Kernel Debugging With Kgdb
In Kernel memory debugging techniques, we talked about using script decode_stacktrace.sh to translate addresses to lines, or if only interested in one entry ...
kgdb
Kernel Debugging With Kgdb
In Kernel memory debugging techniques, we talked about using script decode_stacktrace.sh to translate addresses to lines, or if only interested in one entry ...
fuzz
Syzkaller: Coverage-guided Kernel Fuzzer
Syzkaller is a coverage-guided fuzzer for Linux kernel, it was mainly developed by Dmitry Vyukov, and with many other developers, it’s under active developme...
syzbot
Syzkaller: Coverage-guided Kernel Fuzzer
Syzkaller is a coverage-guided fuzzer for Linux kernel, it was mainly developed by Dmitry Vyukov, and with many other developers, it’s under active developme...
KASAN
Syzkaller: Coverage-guided Kernel Fuzzer
Syzkaller is a coverage-guided fuzzer for Linux kernel, it was mainly developed by Dmitry Vyukov, and with many other developers, it’s under active developme...
UBSAN
Syzkaller: Coverage-guided Kernel Fuzzer
Syzkaller is a coverage-guided fuzzer for Linux kernel, it was mainly developed by Dmitry Vyukov, and with many other developers, it’s under active developme...
KCOV
Syzkaller: Coverage-guided Kernel Fuzzer
Syzkaller is a coverage-guided fuzzer for Linux kernel, it was mainly developed by Dmitry Vyukov, and with many other developers, it’s under active developme...
fd
Setup Development Environment on Phicomm T1
Basic Setup
rg
Setup Development Environment on Phicomm T1
Basic Setup
hosts
Setup Development Environment on Phicomm T1
Basic Setup
zsh
Setup Development Environment on Phicomm T1
Basic Setup
oom
Setup Development Environment on Phicomm T1
Basic Setup
kptr_restrict
Random Kernel Debugging Tips
All-zero address shown when do cat /proc/modules echo 0 > /proc/sys/kernel/kptr_restrict # or with sysctl sysctl kernel.kptr_restrict=0
modules
Random Kernel Debugging Tips
All-zero address shown when do cat /proc/modules echo 0 > /proc/sys/kernel/kptr_restrict # or with sysctl sysctl kernel.kptr_restrict=0
objdump
Random Kernel Debugging Tips
All-zero address shown when do cat /proc/modules echo 0 > /proc/sys/kernel/kptr_restrict # or with sysctl sysctl kernel.kptr_restrict=0
addr2line
Random Kernel Debugging Tips
All-zero address shown when do cat /proc/modules echo 0 > /proc/sys/kernel/kptr_restrict # or with sysctl sysctl kernel.kptr_restrict=0
markdown
Markdown Cheatsheet
Preserve white spaces In macOS, you need to press⌥ Opt+Space
pihole
Install Pi-hole with Docker on Phicomm N1
Install required packages ```bash $ sudo apt install docker.io -y $ sudo apt install docker-compose -y $ sudo apt install lighttpd -y
n1
Install Pi-hole with Docker on Phicomm N1
Install required packages ```bash $ sudo apt install docker.io -y $ sudo apt install docker-compose -y $ sudo apt install lighttpd -y
tainted
What Does Tainted Flags Mean in Oops Messages
[ 81.890105] CPU: 3 PID: 890 Comm: insmod Tainted: G O 4.19.108-v8+ #1
interrupts
Phicomm N1 Box High CPU Usage Due to IRQ-42
While playing Armbian with Phicomm N1 box, I found kernel thread irq/42-0.200908 have very high cpu usage thus cause the load average to around 2, this is a ...
top
Phicomm N1 Box High CPU Usage Due to IRQ-42
While playing Armbian with Phicomm N1 box, I found kernel thread irq/42-0.200908 have very high cpu usage thus cause the load average to around 2, this is a ...
config
Back to top ↑dependency
Back to top ↑ramoops
Enable pstore for kernel oops/panic dumping
Debugging devices without serial console is big challenge especially for kernel panic issues, pstore (persistent store) writes kernel messages before system ...
pstore
Enable pstore for kernel oops/panic dumping
Debugging devices without serial console is big challenge especially for kernel panic issues, pstore (persistent store) writes kernel messages before system ...
ICS
Internet Connection Sharing with Armbian
I need to work while travelling in the following couple of months, so I need all my devices connected to the internet, N1 has a Ethernet port and wireless mo...
nat
Internet Connection Sharing with Armbian
I need to work while travelling in the following couple of months, so I need all my devices connected to the internet, N1 has a Ethernet port and wireless mo...
nmcli
Internet Connection Sharing with Armbian
I need to work while travelling in the following couple of months, so I need all my devices connected to the internet, N1 has a Ethernet port and wireless mo...
iptables
Internet Connection Sharing with Armbian
I need to work while travelling in the following couple of months, so I need all my devices connected to the internet, N1 has a Ethernet port and wireless mo...
openresolv
Internet Connection Sharing with Armbian
I need to work while travelling in the following couple of months, so I need all my devices connected to the internet, N1 has a Ethernet port and wireless mo...
qrcp
Quick File Transfer with QR code
From time to time, I need to transfer files from computer to my android phone, install apk for example, I can use the app store if the app can be found there...
qrcode
Quick File Transfer with QR code
From time to time, I need to transfer files from computer to my android phone, install apk for example, I can use the app store if the app can be found there...
systems
Reading Notes on Systems Performance
Ch 1 Introduction Ch 2 Methodology Ch 3 Operating Systems Ch 4 Observability Tools Ch 5 Applications Ch 6 CPUs Ch 7 Memory Ch 8 File Systems...
bpf
Reading Notes on BPF Performance Tools
Ch 1 Introduction Ch 2 Technology Background Ch 3 Performance Analysis Ch 4 BCC Ch 5 bpftrace Ch 6 CPUs Ch 7 Memory Ch 8 File Systems Ch 9...
tombstone
A List of Common Reasons for Segmentation Faults
Segment fault are common issues for native developers, it is caused by accessing memory location that is not allowed to, I’m gonna list the possible reasons ...
segfault
A List of Common Reasons for Segmentation Faults
Segment fault are common issues for native developers, it is caused by accessing memory location that is not allowed to, I’m gonna list the possible reasons ...
stack
A List of Common Reasons for Segmentation Faults
Segment fault are common issues for native developers, it is caused by accessing memory location that is not allowed to, I’m gonna list the possible reasons ...
debuggerd
A List of Common Reasons for Segmentation Faults
Segment fault are common issues for native developers, it is caused by accessing memory location that is not allowed to, I’m gonna list the possible reasons ...
armbian
Smart Home: Install Home Assistant on Docker
This is a quick setup of home assistant with docker compose.
container
An Introduction to Local Development with Docker Container
Previously I wrote a post about how to setup TV box as a development machine, I cannot take a box everywhere I go, because it is not that convenient to find ...
focal
An Introduction to Local Development with Docker Container
Previously I wrote a post about how to setup TV box as a development machine, I cannot take a box everywhere I go, because it is not that convenient to find ...
barrier
Share Mouse and Keyboard Across Computers with Barrier
Six years ago I use synergy (ver1.5.1) for sharing keyboard and mouse with other computers, which is great, then it became a commercial software, after upgra...
synergy
Share Mouse and Keyboard Across Computers with Barrier
Six years ago I use synergy (ver1.5.1) for sharing keyboard and mouse with other computers, which is great, then it became a commercial software, after upgra...
jellyfin
Manage Local Media with Jellyfin
Jellyfin is an open source local media management system, it is descended from Emby which is now goes commercial, it can fetch metadata from various website ...
emby
Manage Local Media with Jellyfin
Jellyfin is an open source local media management system, it is descended from Emby which is now goes commercial, it can fetch metadata from various website ...
mirror
An Incomplete Guide to Docker
Install docker on Armbian
cache
An Incomplete Guide to Docker
Install docker on Armbian
rasp
Smart Home: Install Home Assistant Supervised
Previously I installed HassOS, it works pretty well except the fact that it is a black box for me at some extent, this time, I take a step further and try to...
supervised
Smart Home: Install Home Assistant Supervised
Previously I installed HassOS, it works pretty well except the fact that it is a black box for me at some extent, this time, I take a step further and try to...
OpenJTAG
Debugging Mini2440 with OpenOCD
Bring board up for the first time, it usually involves debugging with JTAG, in this post I will be using OpenJTAG for mini2440, showing how to load program w...
start.S
U-Boot: Understanding Start.S
U-Boot is a universal bootloader for many architectures, the U-Boot image build against current version (u-boot-2020.10) cannot fit the size of stepping zone...
ARM
The ARM Instruction Set
Mnemonic Instruction Action ADC Add with carry Rd: = Rn + Op2 + Carry ADD ...
Instruction
The ARM Instruction Set
Mnemonic Instruction Action ADC Add with carry Rd: = Rn + Op2 + Carry ADD ...
SWD
Turn Your Raspberry Pi into a JTAG Adapter
I have several Raspberry Pis in hand, they are all not being used for a very long time because of the poor performance of the MMC controller, but it doesn’t ...
ok6410
Turn Your Raspberry Pi into a JTAG Adapter
I have several Raspberry Pis in hand, they are all not being used for a very long time because of the poor performance of the MMC controller, but it doesn’t ...
Raspberry
Turn Your Raspberry Pi into a JTAG Adapter
I have several Raspberry Pis in hand, they are all not being used for a very long time because of the poor performance of the MMC controller, but it doesn’t ...
bitbang
Turn Your Raspberry Pi into a JTAG Adapter
I have several Raspberry Pis in hand, they are all not being used for a very long time because of the poor performance of the MMC controller, but it doesn’t ...
automake
Build Hello World with Automake
There are lot of IDEs out there can build apps or libraries for you, but this is not the way I like, I prefer the command line, today I am gonna show you how...
ramdisk
Bring Latest Linux Kernel to MINI2440
Poring Linux kernel to board is much easier than the age of version 2.6, I want to make an update my school projects, part of this procedure involves the ker...
rootfs
Bring Latest Linux Kernel to MINI2440
Poring Linux kernel to board is much easier than the age of version 2.6, I want to make an update my school projects, part of this procedure involves the ker...
hang
Bring Latest Linux Kernel to MINI2440
Poring Linux kernel to board is much easier than the age of version 2.6, I want to make an update my school projects, part of this procedure involves the ker...
console
Curated List of Reasons for Boards Stuck on “Starting kernel …”
Machine id mismatch
Starting kernel
Curated List of Reasons for Boards Stuck on “Starting kernel …”
Machine id mismatch
FIT
U-Boot: Boot FIT Kernel Image
The way build ramdisk is not an option for me, load both uImage and ramdisk with U-Boot seems not a good way either, and as uImage is a legacy format, there ...
Flattened
U-Boot: Boot FIT Kernel Image
The way build ramdisk is not an option for me, load both uImage and ramdisk with U-Boot seems not a good way either, and as uImage is a legacy format, there ...
inline
Fix a Build Breakage on Inline Function
I’ve done a lot of work on u-boot-2010.09 for MINI2440 to make development process more comfortable, unfortunately, the archived u-boot images were deleted b...
weak
Fix a Build Breakage on Inline Function
I’ve done a lot of work on u-boot-2010.09 for MINI2440 to make development process more comfortable, unfortunately, the archived u-boot images were deleted b...
UART
New Year’s Resolution - 2021
Wireless to UART Bridge
timing
Understanding Timing Parameters in Nand Flash Controller
The NAND flash used in mini2440 is from Samsung, the part number is K9F2G08U0C, the meaning of it is defined in Samsung Part Number Decoder, we can get the b...
nand
Understanding Timing Parameters in Nand Flash Controller
The NAND flash used in mini2440 is from Samsung, the part number is K9F2G08U0C, the meaning of it is defined in Samsung Part Number Decoder, we can get the b...
esp
Wireless debugging with esplink
Serial console is always an very important tool when doing low level development such as kernel or bootloader, the most commonly used are the USB to serial c...
esplink
Wireless debugging with esplink
Serial console is always an very important tool when doing low level development such as kernel or bootloader, the most commonly used are the USB to serial c...
esp32
Run Zephyr RTOS on ESP32
IoT gains too much attention these years, there are various RTOS are claimed to IoT OS, Zephyr OS is one of them, it is originated from WindRiver and is a pr...
Zephyr
Run Zephyr RTOS on ESP32
IoT gains too much attention these years, there are various RTOS are claimed to IoT OS, Zephyr OS is one of them, it is originated from WindRiver and is a pr...
micropython
Run MicroPython on ESP8266
MicroPython is a python implementation aimed to be running on MCUs such as ESP8266/ESP32, stm32 etc, all the ports can be found here, the following will only...
sketch
Blink Sketch on ESP8266
Making blink LED working with Arduino on ESP8266 is incredibly easy, with just a few clicks, of course you need to install Arduino IDE first, download the la...
Arduino
Blink Sketch on ESP8266
Making blink LED working with Arduino on ESP8266 is incredibly easy, with just a few clicks, of course you need to install Arduino IDE first, download the la...
Munin
Monitoring Embedded Devices with Munin
Recently I was debugging a system hang problem on arm board, I reproduced this issue once, and noticed when this occurred, the interrupts on can interface is...
Prometheus
Monitoring Android with Prometheus and Grafana
Android operation system is becoming more and more complicated as time goes by, some system issues are hard to diagnostic, and not easy to reproduce, Android...
Grafana
Monitoring Android with Prometheus and Grafana
Android operation system is becoming more and more complicated as time goes by, some system issues are hard to diagnostic, and not easy to reproduce, Android...
setup
Setup Development Environment with Ansible
Prerequsite
ansible
Setup Development Environment with Ansible
Prerequsite
automation
Setup Development Environment with Ansible
Prerequsite
Ubuntu
Setup Development Environment with Ansible
Prerequsite
recovery
Reboot Android Device without Using reboot Command
When I am writing plugin for workload automation, I met a issue that execution will fail when I want to enter android recovery mode with: self.target.execute...
Joplin
Joplin: My New Note-taking Solution
Update: I switched to vim+git for note-taking this week because Joplin deleted a lot of my notes by accident, I put this post here for reference only, I m...
syncthing
Sync Things with Syncthing
I use Syncthing to sync my notes from work desktop compute to vps server, so I can continue my work at home, syncthing is pretty easy to setup and use.
docker-compose
Sync Things with Syncthing
I use Syncthing to sync my notes from work desktop compute to vps server, so I can continue my work at home, syncthing is pretty easy to setup and use.
vagrant
Setup Build Environment with Vagrant
As a system engineer, I have to manage various build envrionmets, build all the projects against one Ubuntu version became imposssible, one change for one pr...
vbox
Setup Build Environment with Vagrant
As a system engineer, I have to manage various build envrionmets, build all the projects against one Ubuntu version became imposssible, one change for one pr...
Jenkins
Setup Jenkins with Docker
Jenkins is one of the most popular continuous integration solution, I use it both for work and personal project, it provides webUI interface, to save to conf...
Docker
Setup Jenkins with Docker
Jenkins is one of the most popular continuous integration solution, I use it both for work and personal project, it provides webUI interface, to save to conf...
nextcloud
NextCloud with Docker
Previously I deployed a nextcloud container in digitalocean droplet for my note synchronization. This time I want use nextcloud to hold all my documents and ...
patch
Create OpenWrt Style of Patch with Quilt
OpenWrt using its own format of patch file which can be created with quilt. Before creating patches for OpenWrt, we need to create a configuration file for q...
quilt
Create OpenWrt Style of Patch with Quilt
OpenWrt using its own format of patch file which can be created with quilt. Before creating patches for OpenWrt, we need to create a configuration file for q...
File Sharing
File Sharing with File Browser
Previously, I use cowtransfer to share files with our partners, thanks to cowtransfer-uploader, it is very convenient for automation, this changed recently, ...
photoprism
Build Famliy Album with PhotoPrism
After I uploaded my photos to nextcloud, I realized, nextcloud is probably not a good choice for hosting photos, so this time I try to manage these photos wi...
process
Embedded Linux Process Supervision
For making a real world product, robustness is very important, some process may crash occasionally, this is possible even if the system is passed all kinds o...
runit
Embedded Linux Process Supervision
For making a real world product, robustness is very important, some process may crash occasionally, this is possible even if the system is passed all kinds o...
busybox
Embedded Linux Process Supervision
For making a real world product, robustness is very important, some process may crash occasionally, this is possible even if the system is passed all kinds o...
supervisord
Embedded Linux Process Supervision
For making a real world product, robustness is very important, some process may crash occasionally, this is possible even if the system is passed all kinds o...
svc
Embedded Linux Process Supervision
For making a real world product, robustness is very important, some process may crash occasionally, this is possible even if the system is passed all kinds o...
runsv
Embedded Linux Process Supervision
For making a real world product, robustness is very important, some process may crash occasionally, this is possible even if the system is passed all kinds o...
runsvdir
Embedded Linux Process Supervision
For making a real world product, robustness is very important, some process may crash occasionally, this is possible even if the system is passed all kinds o...
cowtransfer
Upload Files to Cow Transfer with Command Line
cowTransfer-uploader is a command line tool that can be used as part of automation, here is the example of how to get download URL and secret code: ```sh mem...
bash
Upload Files to Cow Transfer with Command Line
cowTransfer-uploader is a command line tool that can be used as part of automation, here is the example of how to get download URL and secret code: ```sh mem...
Login
Fixing Authentication Error on Login
This issue happens when I trying to using some app, and cannot failed to install it’s dependancies, commplaining about python3, so I uninstalled python3, apt...
Aunthentication
Fixing Authentication Error on Login
This issue happens when I trying to using some app, and cannot failed to install it’s dependancies, commplaining about python3, so I uninstalled python3, apt...
nps
Make Selfhosted Services Public
If you are hosting services at home and want to be accessed from outside, there are couple of options: Cloudflare Tunnel frp nps ngrok
ngrok
Make Selfhosted Services Public
If you are hosting services at home and want to be accessed from outside, there are couple of options: Cloudflare Tunnel frp nps ngrok
startup
Execute Shell Script on Boot
I have built a rootfs with buildroot, rootfs is squashfs with overlayfs support for ease of writting configuration files such as dropbear that needs write pe...
overlayfs
Execute Shell Script on Boot
I have built a rootfs with buildroot, rootfs is squashfs with overlayfs support for ease of writting configuration files such as dropbear that needs write pe...
calibre
Calibre Powered Online Book Store
Generate Calibre Database
kindle
Calibre Powered Online Book Store
Generate Calibre Database
book
Calibre Powered Online Book Store
Generate Calibre Database
cross-compile
Memo for Cross Compile
vmstat
gperftools
Detect Memory Leak with gperftools
Build libtcmalloc
libtcmalloc
Detect Memory Leak with gperftools
Build libtcmalloc
ltp
Test Linux on ROC-RK3328-CC with LTP
Cross compile ltp
test
Test Linux on ROC-RK3328-CC with LTP
Cross compile ltp
yocto
Test Linux on ROC-RK3328-CC with LTP
Cross compile ltp
Crosstool-NG
Create Toolchain with Crosstool-NG
Preparation sudo apt install -y flex help2man libtool-bin bison libncurses5-dev wget -c http://crosstool-ng.org/download/crosstool-ng/crosstool-ng-1.26.0.tar...
infer
Analyzing Linux C Code with Facebook Infer
Build infer ```sh sudo apt install libstdc++-12-dev linux-libc-dev:i386 gcc-multilib sudo ln -sf /usr/include/x86_64-linux-gnu/asm /usr/include/asm git clone...
StaticAnalyzer
Analyzing Linux C Code with Facebook Infer
Build infer ```sh sudo apt install libstdc++-12-dev linux-libc-dev:i386 gcc-multilib sudo ln -sf /usr/include/x86_64-linux-gnu/asm /usr/include/asm git clone...
codechecker
Analyzing Linux C Code with CodeChecker
Install CodeChecker and dependencies
cppcheck
Analyzing Linux C Code with CodeChecker
Install CodeChecker and dependencies
clang-tidy
Analyzing Linux C Code with CodeChecker
Install CodeChecker and dependencies
flutter-elinux
Build Flutter App for Embedded Linux
Flutter SDK git clone https://github.com/sony/flutter-elinux.git sudo mv flutter-elinux /opt/ export PATH=$PATH:/opt/flutter-elinux/bin:/opt/flutter-elinux/f...
dart
Build Flutter App for Embedded Linux
Flutter SDK git clone https://github.com/sony/flutter-elinux.git sudo mv flutter-elinux /opt/ export PATH=$PATH:/opt/flutter-elinux/bin:/opt/flutter-elinux/f...
devtools
Build Flutter App for Embedded Linux
Flutter SDK git clone https://github.com/sony/flutter-elinux.git sudo mv flutter-elinux /opt/ export PATH=$PATH:/opt/flutter-elinux/bin:/opt/flutter-elinux/f...
glibc
Run clang 15 executable on legacy device
For a suspected memory leak issue on a legacy device running OpenWrt build with gcc-8, I need a toolchain with leak sanitizer support, so I try to generate o...
ld.so
Run clang 15 executable on legacy device
For a suspected memory leak issue on a legacy device running OpenWrt build with gcc-8, I need a toolchain with leak sanitizer support, so I try to generate o...
patchelf
Run clang 15 executable on legacy device
For a suspected memory leak issue on a legacy device running OpenWrt build with gcc-8, I need a toolchain with leak sanitizer support, so I try to generate o...
rpath
Run clang 15 executable on legacy device
For a suspected memory leak issue on a legacy device running OpenWrt build with gcc-8, I need a toolchain with leak sanitizer support, so I try to generate o...
port forwarding
Share adb device with another computer
Android adb device was attached to laptop(C1) running Ubuntu, the other computer also with Ubuntu installed, we call it C2.
tunneling
Share adb device with another computer
Android adb device was attached to laptop(C1) running Ubuntu, the other computer also with Ubuntu installed, we call it C2.
usbip
Share adb device with another computer
Android adb device was attached to laptop(C1) running Ubuntu, the other computer also with Ubuntu installed, we call it C2.
gitea
Install Gitea with Docker
docker-compose
webhook
Install Gitea with Docker
docker-compose