WIP: Agnos Kernel Debugging

Common commands:

Mounting the drive for writing: mount -o remount, rw /

Ubuntu system logs are located at /var/log and /sys/fs/pstore print the kernel logs to terminal: dmesg or print the last few lines with dmesg | tail

if /sys/fs/pstore doesn't have any files, do a warm reboot then there should be logs. tail -n 5 /sys/fs/pstore/console-ramoops-0

you may consider /sys/fs/pstore/console-ramoops-0 to be the live message ring you see with dmesg, but snapshotted from the prior boot. doesn't work across cold boots (it's in RAM, hence the name) but it's a fast easy way to glance back at a kernel panic

Connect to the device through a UART connection (slow): On host computer: sudo apt install screen sudo screen /dev/ttyUSB* 115200

press enter to wake up the UART connection and show the login prompt username: comma password: comma