Is there a way of triggering an automatic reboot into failsafe from a running system?
I mean such that I don't need to press any hardware buttons or other triggers.
Similar to a "reboot to bios" function on some computers.
I don't know for what use case yet, just wanted to know if it is possible (even if not implemented today)?
grep -q 'failsafe=' /proc/cmdline && FAILSAFE=true && export FAILSAFE
- grub based systems pretty easy ( sed default )
- uboot systems with access to bootopts likely need recompile to support them from cmdline ( fw_setenv )
in other words, preinit has hooks but you'd need a custom method to modify cmdline from the running system ( and revert back ). not sure if a flagfile routine would work as due to rom being read only...