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SubjectRe: memory beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y
Thank you for your reply, Roland. Unfortunately, this continues
happening after having installed the most recent version of the BIOS
available from Dell.

I understand this is a problem in the BIOS and not the kernel, but is
there a way to have the kernel work around this bug in the BIOS and
make that memory accessible? Eg,

http://www.gossamer-threads.com/lists/linux/kernel/991748#991748

The difference seems to be that the BIOS on this machine I am using
does list 8GB memory available.

Thanks for any help,

James

On Tue, Jan 13, 2009 at 9:22 PM, Roland Dreier <rdreier@cisco.com> wrote:
> > I am running kernel 2.6.28 on a computer with 8GB RAM. The BIOS
> > detects all 8GB, yet
> >
> > jk@as12:~$ free
> > total used free shared buffers cached
> > Mem: 3622504 799696 2822808 0 90936 369604
> > -/+ buffers/cache: 339156 3283348
> > Swap: 6867776 0 6867776
>
> The message in your kernel log:
>
> [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4096MB of RAM.
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1662 mtrr_trim_uncached_memory+0x283/0x2a4()
>
> is a clue. You might want to look for a BIOS update for your
> motherboard.
>
> - R.
>


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