Difference between revisions of "Magic SysRq Key"
From ArmadeusWiki
(New page: ==Introduction== Excerpt from Linux's Documentation/sysreq.txt:<br> ''What is the magic SysRq key?'' ''It is a 'magical' key combo you can hit which the kernel will respond to regardless ...) |
(No difference)
|
Revision as of 12:08, 8 December 2011
Contents
Introduction
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.
Usage
- 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
