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 ...
Recent posts
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 ...
gdb cheatsheet
breakpoint
What Does Tainted Flags Mean in Oops Messages
[ 81.890105] CPU: 3 PID: 890 Comm: insmod Tainted: G O 4.19.108-v8+ #1
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
Markdown Cheatsheet
Preserve white spaces In macOS, you need to press⌥ Opt+Space
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...
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
Setup Development Environment on Phicomm T1
Basic Setup