Re: Windows side agrees that lowmem corruption is a problem too

From: Ingo Molnar
Date: Tue Jun 08 2010 - 15:08:57 EST

* H. Peter Anvin <hpa@xxxxxxxxx> wrote:

> On 06/08/2010 11:28 AM, Yuhong Bao wrote:
> >
> > Adding mingo and gregkh to CC list.
> >> Remember the lowmem corruption problems that lead the code that displays this to be added to Linux:> AMI BIOS detected: BIOS may corrupt low RAM, working around it.> which was IMO way too broad. Good news, the Windows side agree that this is a problem too:>>> Yuhong Bao
> >
> Hardly "way too broad". I'm starting to think we should enable it
> unconditionally, given the number of machines which have exhibited that
> problem. As shown in the whitepaper, Vista/Win7 even avoid using
> < 1 MB for a lot of things, presumably for this reason.
> If it only was suspend, it would be one thing, but from what I've seen
> it has been known to happen at other times too (e.g. HDMI cable insertion!)

Yep, patterns of some silly OSD bitmap showed up in one of the corruption -
firmware displaying a 'you inserted a cable' kind of icon somewhere and
messing up the SMM code or so ...

I agree that dis-using <1M by default is probably the sanest option.

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