linux-kernel - Re: Strange mtrrs in Aspire One

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Date:	Sat, 4 Oct 2008 10:55:19 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"J.A. Magallón" <jamagallon@....com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Strange mtrrs in Aspire One

On Sat, Oct 4, 2008 at 6:22 AM, J.A. Magallón <jamagallon@....com> wrote:
> On Mon, 29 Sep 2008 18:05:51 -0700, "Yinghai Lu" <yinghai@...nel.org> wrote:
>
>> On Mon, Sep 29, 2008 at 4:57 PM, J.A. Magallón <jamagallon@....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.

YH
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