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    SubjectIDE DMA problems on 2.4.0 with vt82c686a driver
    Hello,
    Since this looks like either a chipset, drive, or driver problem, I am
    submitting this.
    I have recently started using DMA mode on my harddisk. However, I
    occasionally (not often/constant, but sometimes) get CRC errors:
    hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
    hda: dma_intr: error=0x84 { DriveStatusError BadCRC }

    After reading some archives in linux-kernel, I tried changing some
    options. Then I changed out the 40 pin, 80 wire cable with a new one.
    The errors still occasionally happened, so I then checked out the
    included floppy disk with the drive and used the utilities and saw that
    it was set for a maximum capability of ATA/100, so i changed it to
    ATA/66, but no change in results. I've since changed it back to ATA/100
    capabilities. Running without DMA mode never gives any errors what so
    ever. Running with DMA mode gives me over 30 more MB/sec, so I would
    really like to use it...

    My main concern that I havnt beem able to find an answer for on any
    archives or documentation, Can this cause file system corruption in any way?

    The hardware is a VP_IDE: VIA vt82c686a IDE UDMA66 (VIA KT133 chipset on
    an Abit KT7 board)
    The drive is a Western Digital Caviare 7200rpm 40gig hard drive.
    I have support for my chipset compiled in as well

    Kernel: 2.4.0

    [root@Earth root]$ hdparm -i /dev/hda

    /dev/hda:

    Model=WDC WD400BB-00AUA1, FwRev=18.20D18, SerialNo=WD-WMA6R2018028
    Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
    RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
    BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=off
    CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=78165360
    IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
    PIO modes: pio0 pio1 pio2 pio3 pio4
    DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 udma5

    [root@Earth root]# hdparm -I /dev/hda

    /dev/hda:

    Model=DW CDW04B0-B00UA1A , FwRev=812.D081,
    SerialNo=DWW-AMR6028120
    Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
    RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
    BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
    CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=78165360
    IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}

    [root@Earth root]# hdparm /dev/hda

    /dev/hda:
    multcount = 0 (off)
    I/O support = 0 (default 16-bit)
    unmaskirq = 0 (off)
    using_dma = 1 (on)
    keepsettings = 0 (off)
    nowerr = 0 (off)
    readonly = 0 (off)
    readahead = 8 (on)
    geometry = 4865/255/63, sectors = 78165360, start = 0

    PIO modes: pio0 pio1 pio2 pio3 pio4
    DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 udma5


    VP_IDE: VIA vt82c686a IDE UDMA66 controller on pci0:7.1
    ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:DMA, hdd:pio
    ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    ide1 at 0x170-0x177,0x376 on irq 15
    hda: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=38166/64/32, UDMA(66)


    If any other information is needed, I will be more than happy to supply
    it. Any help/information will be greatly appreciated.
    Thank you.

    --
    James Brents
    James@nistix.com

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