lkml.org 
[lkml]   [2008]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] x86_32: trim memory by updating e820 v3
    On Sat, Apr 26, 2008 at 5:56 AM, Gabriel C <nix.or.die@googlemail.com> wrote:
    >
    > Andrew Morton wrote:
    > > On Tue, 22 Jan 2008 16:23:20 -0800 Yinghai Lu <Yinghai.Lu@Sun.COM> wrote:
    > >
    > >> [PATCH] x86_32: trim memory by updating e820 v3
    > >>
    > >> when mtrr is not covering all e820 table, need to trim the ram, need to update e820
    > >>
    > >> reuse some code for x86_64
    > >>
    > >> here need to add early_get_cap and use it in early_cpu_detect, and move mtrr_bp_init early
    > >>
    > >> need Justine to test with his special system with bug bios.
    > >>
    > >> Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
    > >
    > > Speaking of mtrr and e820....
    > >
    > > Could someone please take a peek at
    > > http://bugzilla.kernel.org/show_bug.cgi?id=10508 ?
    > >
    > > For some reason we seem to have turned this:
    > >
    > > [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
    > > [ 0.000000] BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved)
    > > [ 0.000000] BIOS-e820: 0000000000100000 - 00000000bf6d0000 (usable)
    > > [ 0.000000] BIOS-e820: 00000000bf6d0000 - 00000000bf6e3000 (ACPI NVS)
    > > [ 0.000000] BIOS-e820: 00000000bf6e3000 - 00000000c0000000 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000fed1c000 - 00000000fed90000 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    > > [ 0.000000] BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
    > > [ 0.000000] BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
    > >
    > > into this:
    > >
    > > reg00: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
    > > reg01: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
    > > reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
    > > reg03: base=0xbf700000 (3063MB), size= 1MB: uncachable, count=1
    > > reg04: base=0xbf800000 (3064MB), size= 8MB: uncachable, count=1
    > >
    > > which screws up the X server's attempt to map the video memory at
    > > 0xd0000000.
    >
    > I see that on my box with ASUS P5E-VM DO and 4G RAM.
    > It has an Q35 intel chipset and the intel card is set to use 256MB in BIOS.
    >
    > I tested 2.6.{24*,25,25-next,25-latest-git} 32/64 bit.
    >
    > Also I get the mtrr type mismatch message on 32 and 64 bit kernels.
    >
    > ...
    >
    > [ 0.000000] BIOS-provided physical RAM map:
    > [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009ec00 (usable)
    > [ 0.000000] BIOS-e820: 000000000009ec00 - 00000000000a0000 (reserved)
    > [ 0.000000] BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
    > [ 0.000000] BIOS-e820: 0000000000100000 - 00000000cf550000 (usable)
    > [ 0.000000] BIOS-e820: 00000000cf550000 - 00000000cf55e000 (ACPI data)
    > [ 0.000000] BIOS-e820: 00000000cf55e000 - 00000000cf5e0000 (ACPI NVS)
    > [ 0.000000] BIOS-e820: 00000000cf5e0000 - 00000000cf600000 (reserved)
    >
    > [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    > [ 0.000000] BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
    > [ 0.000000] BIOS-e820: 0000000100000000 - 000000012c000000 (usable)
    > ...
    >
    > cat /proc/mtrr :
    >
    > reg00: base=0xd0000000 (3328MB), size= 256MB: uncachable, count=1
    > reg01: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1
    > reg02: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
    > reg03: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
    > reg04: base=0x120000000 (4608MB), size= 128MB: write-back, count=1
    > reg05: base=0x128000000 (4736MB), size= 64MB: write-back, count=1
    > reg06: base=0xcf600000 (3318MB), size= 2MB: uncachable, count=1
    >
    >
    > dmesg is saying :
    >
    > ..
    >
    > [ 24.012694] [drm] Initialized i915 1.6.0 20060119 on minor 0
    > [ 24.175500] mtrr: type mismatch for d0000000,10000000 old: write-back new: write-combining
    > [ 24.423740] set status page addr 0x00033000

    another continuous MTRR mapping.

    several months ago, we were talking about modifying MTRR. but Eric
    said that is not safe because acpi and smi...

    YH


    \
     
     \ /
      Last update: 2008-04-27 03:09    [W:0.029 / U:1.772 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site