[coreboot] tiny bootblock problem

Peter Stuge peter at stuge.se
Fri Jan 6 20:36:43 CET 2012

Nils wrote:
> >> Is that a caching problem introduced by tiny bootblock?
> >> What is needed to get it right?
> >Probably MTRRs. With tinybootblock, these are set at slightly
> >different times.
> >GX2 uses Cache-As-RAM, right? That affects MTRRs, too (as CAR is a 
> >"special" MTRR setup)
> Correct me if i'm wrong but Geode GX2/LX doesn't have MTRRs.
> Cache is setup via MSR registers.
> So all that MTRR stuf in tiny bootblok/coreboot is useless to Geode.
> Which regions are used for tiny bootblock that need caching?

The flash chip, most importantly.


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