Magic SysRq Key
Excerpt from Linux's Documentation/sysreq.txt:
What is the magic SysRq key?
It is a 'magical' key combo you can hit which the kernel will respond to regardless of whatever else it is doing, unless it is completely locked up.
- Check it is enabled:
# cat /proc/sys/kernel/sysrq 1
From Host serial console with Kermit
- Send break character (Ctrl-\ b) then the key corresponding to the wanted action. For example to reset the board you will press:
Ctrl+AltGr+8 then b then b
From any terminal on the APF
- Send the character to corresponding /proc interface. For example to reset the board:
# echo b > /proc/sysrq-trigger
From the LCD pseudo terminal with an USB keyboard
- To Be Tested...