Re: memory beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y

[Yinghai Lu]

On Tue, Jan 13, 2009 at 7:10 PM, James Kirin <james.kirin40@xxxxxxxxx> wrote:
> 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

please do
1. boot linux with "disable_mtrr_trim" in grub.conf etc
2. after booting input:
echo "base=0x100000000 size=0x20000000 type=write-back" >/proc/mtrr

later you could put that line in one scripts and call it from inittab
# grep mtrrfixup /etc/inittab
mtrr:345:once:/root/mtrrfixup.sh

YH
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