Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

[Yinghai Lu <yinghai@xxxxxxxxxx>]

On Wed, Dec 19, 2012 at 2:25 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> The problem is that before we have awareness of the memory map, we need to
> map things in order to access them.  This is a big problem and right now
> there are ridiculous heuristics.  I have been working on mapping on demand,
> but there are concerns about the boundaries (i.e. what happens if the
> mapping spill over into a pit like this.)
>
> This kind of stuff is really not acceptable.  A region which will cause
> malfunction if prefetched should not be WB in the MTRR system (I include
> TOM* in that.)  The real question is what we can do to mitigate the damage.

on demand to only map 2M will help ?
or have to return to v6 version for-x86-boot ?
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