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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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