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    SubjectIDE DMA doesn't work with pata_via and compact flash card
    Hello,

    I've got a problem with the linux kernel, which doesn't boot from a
    compact flash card (SanDisk Ultra 2 2048 MB) when trying to use DMA. I
    want to boot my PC from the CF card using a CF-to-IDE adapter. It works
    perfectly when using a card-reader instead of the adapter and booting
    from USB. I'm using kernel 2.6.23 and the new Parallel ATA drivers
    (pata_via). The board is a Tyan Tomcat K7M with the VIA KN400A chipset
    and VT8237 Southbridge. I also tried using the old IDE drivers, which
    give me the same error messages and also hang in a loop like the new
    ones, when using DMA. Turning off DMA for the old IDE drivers or
    patching ata_generic to handle my IDE controller and then deactivating
    DMA in the BIOS works, but then disk I/O is unbelievable slow.. do you
    have any idea how to fix it, so that DMA works?

    Best regards,
    Philipp

    Boot messages:

    scsi0: pata_via
    scsi1: pata_via
    ata1: PATA max UDMA/133 cmd 0x000101f0 ctl 0x000103f6 bmdma 0x0001e500
    irq 14
    ata2: PATA max UDMA/133 cmd 0x000101f0 ctl 0x000103f6 bmdma 0x0001e500
    irq 15
    ata1.00: CFA: SanDisk SDCFH-2048, HDX 4.04, max MWDMA2
    ata1.00: 4001760 sectors, multi 0: LBA
    ata1.00: configured for MWDMA2
    scsi 0:0:0:0: Direct-Access ATA SanDisk SDCFH-20 HDX PQ: 0 ANSI: 5
    sd 0:0:0:0: [sda] 4001760 512-byte hardware sectors (2049 MB)
    sd 0:0:0:0: [sda] Write Protect is off
    sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't
    support DPO or FUA
    sd 0:0:0:0: [sda] 4001760 512-byte hardware sectors (2049 MB)
    sd 0:0:0:0: [sda] Write Protect is off
    sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't
    support DPO or FUA
    sda:[here it hangs for some time ...]<3>ata1.00: exception Emask 0x0
    SAct 0x0 SErr 0x0 action 0x2 frozen
    ata1.00: cmd c8/00:08:00:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 in
    res 40/00:00:00:00:00/00:00:00:00/00 Emask 0x4 (timeout)
    ata1: soft resetting port
    ata1.00: configured for MWDMA
    ata1: EH complete
    ata1.00: cmd c8/00:08:00:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 in
    res 40/00:00:00:00:00/00:00:00:00/00 Emask 0x4 (timeout)
    ata1: soft resetting port
    ata1.00: configured for MWDMA
    ata1: EH complete
    ata1.00: cmd c8/00:08:00:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 in
    res 40/00:00:00:00:00/00:00:00:00/00 Emask 0x4 (timeout)
    ata1: soft resetting port
    ata1.00: configured for MWDMA
    ata1: EH complete
    [...]




    lspci -vv:
    [...]
    00:00.0 Host bridge: VIA Technologies, Inc. VT8378 [KM400/A] Chipset
    Host Bridge
    Subsystem: VIA Technologies, Inc. VT8378 [KM400/A] Chipset Host
    Bridge
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
    ParErr- Stepping- SERR- FastB2B-
    Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium
    >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
    Latency: 8
    Region 0: Memory at e0000000 (32-bit, prefetchable) [size=128M]
    Capabilities: [80] AGP version 3.5
    Status: RQ=32 Iso- ArqSz=0 Cal=2 SBA+ ITACoh- GART64-
    HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4
    Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit-
    FW- Rate=<none>
    Capabilities: [c0] 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-
    [...]
    00:0f.0 IDE interface: VIA Technologies, Inc.
    VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
    (prog-if 8a [Master SecP PriP])
    Subsystem: VIA Technologies, Inc.
    VT82C586/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
    ParErr- Stepping- SERR- FastB2B-
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
    >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 32
    Interrupt: pin A routed to IRQ 18
    Region 0: [virtual] Memory at 000001f0 (32-bit,
    non-prefetchable) [size=8]
    Region 1: [virtual] Memory at 000003f0 (type 3,
    non-prefetchable) [size=1]
    Region 2: [virtual] Memory at 00000170 (32-bit,
    non-prefetchable) [size=8]
    Region 3: [virtual] Memory at 00000370 (type 3,
    non-prefetchable) [size=1]
    Region 4: I/O ports at e500 [size=16]
    Capabilities: [c0] 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-
    [...]
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