Re: [PATCH] x86: trim ram need to check if mtrr is there v3

[Jeremy Fitzhardinge]

Ingo Molnar wrote:
> * Yinghai Lu <Yinghai.Lu@xxxxxxx> wrote:
>
>   
> > [PATCH] x86: trim ram need to check if mtrr is there v3
> >     
>
>   
> > > H. Peter Anvin wrote:
> > > Looks like the code doesn't check that the CPU *has* MTRRs...
> > >       
> > so more strict check if mtrr is there really.
> > bail out if mtrr all blank when qemu cpu model is used
> >
> > and check if is AMD as early
> > also remove 4G less check, according to hpa.
> >     
>
> thanks, applied. Shouldnt we put in an exception for when there is MTRR 
> support, but they dont cover anything. Still emit a warning - but 
> booting up real slow is still better than losing all of RAM and crashing 
> ...
>
> i also updated the messages, they now go like this:
>
>   WARNING: strange, CPU MTRRs all blank?
>
> and:
>
>   WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 45MB of RAM.
>   

Though I don't see this form of message; have you pushed your changes 
out to the public x86.git#mm tree?

   J
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