Re: [PATCH 1/3 -v4] x86_64 EFI runtime service support: EFI basic runtime service support

H. Peter Anvin
2007-10-25T17:12:19Z

Andi Kleen wrote:
>> Especially for accessing the real time clock that has a well
>> defined hardware interface going through efi an additional
>> software emulation layer looks like asking for trouble.
>
> I agree it's pointless for the hardware clock, but EFI
> also offers services to write some data to the CMOS RAM
> which could be very useful to save oops data over reboot.
> I don't think this can be done safely otherwise
> without BIOS cooperation.
>

The ability to scurry away even a small amount of data without relying
on the disk system is highly desirable. Think next-boot type information.

-hpa