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    SubjectHow to disable DMA for compact-flash disk?
    I'm trying to use Fedora 11 with default kernel on an old via system
    that boots from compact flash. DMA is not supported on the CF for
    whatever reason, and in previous kernels, I've always disabled
    DMA, first with ide=nodma, and then later with
    ide_core.nodma=0.0 ide_core.nodma=0.1 ...

    However, this no longer works in the 2.6.29.6 kernel.

    Fedora 11 32-bit
    Kernel 2.6.29.6-217.2.3.fc11.i686.PAE

    (I can't get a custom built & somewhat hacked 2.6.31-rc5 to find a ramdisk or root-disk, but the
    errors about unknown boot option are the same).


    From dmesg output:


    Built 1 zonelists in Zone order, mobility grouping on. Total pages: 255649
    Kernel command line: ro root=UUID=6f65a5dd-7872-4715-be9c-3741bd6ac7d3
    ide_core.nodma=0.0 ide_core.nodma=0.1 ide_core.nodma=1.0 ide_core.nodm
    a=1.1 console=ttyS0,38400
    Unknown boot option `ide_core.nodma=0.0': ignoring
    Unknown boot option `ide_core.nodma=0.1': ignoring
    Unknown boot option `ide_core.nodma=1.0': ignoring
    Unknown boot option `ide_core.nodma=1.1': ignoring


    ....

    Gscsi0 : pata_via
    scsi1 : pata_via
    ata1: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xe900 irq 14
    ata2: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xe908 irq 15
    input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input2
    ata1.01: CFA: TRANSCEND, 20081024, max UDMA/66
    ata1.01: 3980592 sectors, multi 0: LBA
    ata1.01: limited to UDMA/33 due to 40-wire cable
    ata1.01: configured for UDMA/33
    scsi 0:0:1:0: Direct-Access ATA TRANSCEND 2008 PQ: 0 ANSI: 5
    sd 0:0:1:0: [sda] 3980592 512-byte hardware sectors: (2.03 GB/1.89 GiB)
    sd 0:0:1:0: [sda] Write Protect is off
    sd 0:0:1:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
    sd 0:0:1:0: [sda] 3980592 512-byte hardware sectors: (2.03 GB/1.89 GiB)
    sd 0:0:1:0: [sda] Write Protect is off
    sd 0:0:1:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
    sda:<3>ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
    ata1.01: cmd c8/00:08:00:00:00/00:00:00:00:00/f0 tag 0 dma 4096 in
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    ata1.01: status: { DRDY }
    ata1: soft resetting link
    ata1.01: configured for UDMA/33
    ata1: EH complete
    ata1.01: limiting speed to UDMA/25:PIO4
    ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
    ata1.01: cmd c8/00:08:00:00:00/00:00:00:00:00/f0 tag 0 dma 4096 in
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    ata1.01: status: { DRDY }
    ata1: soft resetting link
    ata1.01: configured for UDMA/25
    ata1: EH complete
    ata1.01: limiting speed to PIO4
    ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
    ata1.01: cmd c8/00:08:00:00:00/00:00:00:00:00/f0 tag 0 dma 4096 in
    res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    ata1.01: status: { DRDY }
    ata1: soft resetting link
    ata1.01: configured for PIO4
    ata1: EH complete
    sda1
    sd 0:0:1:0: [sda] Attached SCSI disk
    sd 0:0:1:0: Attached scsi generic sg0 type 0
    kjournald starting. Commit interval 5 seconds

    --
    Ben Greear <greearb@candelatech.com>
    Candela Technologies Inc http://www.candelatech.com



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