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    SubjectRe: 2.6.27 mtrr fixes do not work
    On Fri, Aug 29, 2008 at 12:10 PM, Alexander Huemer
    <alexander.huemer@sbg.ac.at> wrote:
    > http://xx.vu/~ahuemer/dmesg_5.txt
    > http://xx.vu/~ahuemer/lspci_vvxxx.txt
    > http://xx.vu/~ahuemer/lspci_tv.txt
    >

    pci 0000:00:1e.0: IO window: 0x3000-0x3fff
    pci 0000:00:1e.0: MEM window: 0xdc300000-0xdc3fffff
    pci 0000:00:1e.0: PREFETCH window: 0x000000d8000000-0x000000dbffffff

    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
    (prog-if 01 [Subtractive decode])
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
    Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
    <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Bus: primary=00, secondary=20, subordinate=20, sec-latency=32
    I/O behind bridge: 00003000-00003fff
    Memory behind bridge: dc300000-dc3fffff
    Prefetchable memory behind bridge: 00000000d8000000-00000000dbffffff
    Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort-
    <TAbort- <MAbort+ <SERR- <PERR-
    BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
    PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
    Capabilities: [50] Subsystem: Tyan Computer Device 5397
    00: 86 80 4e 24 07 00 10 00 d9 01 04 06 00 00 01 00
    10: 00 00 00 00 00 00 00 00 00 20 20 20 30 30 80 22
    20: 30 dc 30 dc 01 d8 f1 db 00 00 00 00 00 00 00 00
    30: 00 00 00 00 50 00 00 00 00 00 00 00 ff 00 0c 00
    40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    50: 0d 00 00 00 f1 10 97 53 00 00 00 00 00 00 00 00
    60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    f0: 00 00 00 00 00 00 00 00 80 0f 01 00 00 00 00 00

    20:05.0 VGA compatible controller: XGI Technology Inc. (eXtreme
    Graphics Innovation) Volari Z7 (prog-if 00 [VGA controller])
    Subsystem: XGI Technology Inc. (eXtreme Graphics Innovation) Volari Z7
    Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
    Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
    <TAbort- <MAbort- >SERR- <PERR- INTx-
    BIST result: 00
    Region 0: Memory at d8000000 (32-bit, prefetchable) [size=64M]
    Region 1: Memory at dc300000 (32-bit, non-prefetchable) [size=256K]
    Region 2: I/O ports at 3000 [size=128]
    Capabilities: [40] Power Management version 2
    Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
    Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    00: ca 18 20 00 03 00 30 02 00 00 00 03 00 00 00 80
    10: 08 00 00 d8 00 00 30 dc 01 30 00 00 00 00 00 00
    20: 00 00 00 00 00 00 00 00 00 00 00 00 ca 18 20 00
    30: 00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00
    40: 01 00 02 06 00 00 00 00 00 00 00 00 00 00 00 00
    50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

    mtrr: 0xd8000000,0x2000000 overlaps existing 0xd8000000,0x800000

    so it seems your card HW said it need 64M,

    someone (BIOS or vgabios?) set 8M for it at first. and with write-back...

    # cat /proc/mtrr
    reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1
    reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
    reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
    reg03: base=0xd8000000 (3456MB), size= 8MB: write-back, count=1

    before loading X drivers, need to remove that entry at first.

    echo "disable=3" > /proc/mtrr

    YH


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