Re: [coreboot] RFC GSOC project idea ACPI 4.0/5.0 APIE and ERST for kernel pstore support

[Patrick Georgi]

Am 20.03.2013 21:09, schrieb Marc Jones:
> The ACPI APIE and ERST methods allow the kernel to mount pstore to
> store information in NVRAM (coreboot cbfs). This could be used to
> store errors that are otherwise difficult to track, like suspend and
> resume issues. The implementation would need to be able to find an
> area free in cbfs for storing the data.

Reserve it beforehand? That's what I intend to do for Tiano variables

Patrick

RFC GSOC project idea ACPI 4.0/5.0 APIE and ERST for kernel pstore support

[Marc Jones]

On Wed, Mar 20, 2013 at 2:26 PM, Patrick Georgi  wrote:
> Am 20.03.2013 21:09, schrieb Marc Jones:
> > The ACPI APIE and ERST methods allow the kernel to mount pstore to
> > store information in NVRAM (coreboot cbfs). This could be used to
> > store errors that are otherwise difficult to track, like suspend and
> > resume issues. The implementation would need to be able to find an
> > area free in cbfs for storing the data.
>
> Reserve it beforehand? That's what I intend to do for Tiano variables

Yes, I think we would need a cbfs file for allocating the region
before hand and then that would be used by ERST and pstore. I don' t
know how the region internals work. Also, there are problaly some
pstore limitation and knowing the flash device before hand to set
alignment (erase blocks) etc.

Marc