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    SubjectRe: Strange mtrrs in Aspire One
    On Sat, Oct 4, 2008 at 10:55 AM, Yinghai Lu <yinghai@kernel.org> wrote:
    > On Sat, Oct 4, 2008 at 6:22 AM, J.A. Magallón <jamagallon@ono.com> wrote:
    >> On Mon, 29 Sep 2008 18:05:51 -0700, "Yinghai Lu" <yinghai@kernel.org> wrote:
    >>
    >>> On Mon, Sep 29, 2008 at 4:57 PM, J.A. Magallón <jamagallon@ono.com> wrote:
    >>> > Hi all...
    >>> >
    >>> > My aspire one is giving some strange MTRR settings with rc7-git5 (and
    >>> > prevous kernels, but that is what I run now...):
    >>> >
    >>> > one:~> cat /proc/mtrr
    >>> > reg00: base=0xfffe0000 (4095MB), size= 128KB: write-protect, count=1
    >>> > reg01: base=0xfffc0000 (4095MB), size= 128KB: uncachable, count=1
    >>>
    >>> could make mtrr_cleanup to support 128K gran_size
    >>>
    >>> > reg02: base=0x00000000 ( 0MB), size= 256MB: write-back, count=1
    >>> > reg03: base=0x10000000 ( 256MB), size= 256MB: write-back, count=1
    >>> > reg04: base=0x1f800000 ( 504MB), size= 8MB: uncachable, count=1
    >>> > reg05: base=0x1f600000 ( 502MB), size= 2MB: uncachable, count=1
    >>> > reg06: base=0x1f500000 ( 501MB), size= 1MB: uncachable, count=1
    >>>
    >>> > reg07: base=0x00000000 ( 0MB), size= 128KB: uncachable, count=1
    >>> ..
    >>> > BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
    >>>
    >>> last entry is really sick...
    >>>
    >>
    >> I have applied the patches you have posted in other threads, and this
    >> give a very strange result. The mtrr cleanup did nothing, and I had to put
    >> some printk's all around.
    >
    > will have one patch to assume the [0, 1M) to be coverred by var mtrrs.
    >

    please check other three patches.

    [PATCH 1/3] x86: mtrr_cleanup: print out correct type
    [PATCH 2/3] x86: mtrr_cleanup: first 1M should be coverred in var mtrrs
    [PATCH 3/3] x86: mtrr_cleanup: treat WRPROT as UNCACHEABLE

    you may need to boot with "mtrr_gran_size=64k mtrr_chunk_size=64k"

    YH
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