Re: [PATCH RFC] powerpc/powernv: sysfs entry to force full IPL reboot

Michael Ellerman [off-list ref] writes:

Andrew Donnellan [off-list ref] writes:

quoted

On 23/11/16 12:37, Andrew Donnellan wrote:

quoted

quoted

There's existing logic in kernel/reboot.c to handle a reboot= command
line parameter, which can set the reboot_mode, so my preference would be
that we use that.

Currently we completely ignore the reboot_mode, so there's no backward
compatibility issue.

It looks like the default is REBOOT_COLD, whatever that means. So I
think we could define that on powernv REBOOT_HARD means "do a full IPL".

Sounds good.

Thinking about this more - you can't change that at runtime. :(

Yeah. Is that a problem? From my POV this is basically a "my firmware is
broken" workaround, so you're going to want to set it permanently until
you update your firmware.

The only real world application I can see wanting to do that is perhaps
HTX - where it chooses what kind of bootme run it wants. So, well, for
certain definitions of "real world".

-- 
Stewart Smith
OPAL Architect, IBM.