On Thu, 1 Mar 2001, Hylke van der Schaaf wrote:
> With kernet 2.2.18 DMA mode for my harddisks worked just fine,
> getting IDE DMA working on an AMD7409 controller with kernel 2.4.2 is a problem.
>
> questions:
> Why is DMA disabled on revision < C4?
> How can I gat DMA working again?
AMD7409: disabling single-word DMA support (revision < C4)
This is not Ultra DMA it is the class of orignal from ATA-1/2
>
> The Information:
>
> in 2.2.18 I get:
> --------- dmesg: ----------
> PCI_IDE: unknown IDE controller on PCI bus 00 device 39, VID=1022, DID=7409
> PCI_IDE: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:pio
> PCI_IDE: simplex device: DMA disabled
> ide1: PCI_IDE Bus-Master DMA disabled (BIOS)
> hda: IBM-DPTA-372050, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> hda: IBM-DPTA-372050, 19574MB w/1961kB Cache, CHS=2495/255/63
> ---------------------------
>
> hylke:/home/hylke# hdparm -v /dev/hda
>
> /dev/hda:
> multcount = 16 (on)
> I/O support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 2495/255/63, sectors = 40088160, start = 0
> hylke:/home/hylke# hdparm -tT /dev/hda
>
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 0.89 seconds =143.82 MB/sec
> Timing buffered disk reads: 64 MB in 2.85 seconds = 22.46 MB/sec
> ----------------------------
>
> All was fine.
> I compiled 2.4.2, with:
>
> CONFIG_BLK_DEV_IDEPCI=y
> CONFIG_IDEPCI_SHARE_IRQ=y
> CONFIG_BLK_DEV_IDEDMA_PCI=y
> CONFIG_IDEDMA_PCI_AUTO=y
> CONFIG_BLK_DEV_IDEDMA=y
> CONFIG_IDEDMA_PCI_WIP=y
> CONFIG_AMD7409_OVERRIDE=y
> CONFIG_IDEDMA_AUTO=y
> CONFIG_IDEDMA_IVB=y
>
> and I get:
>
> --------- dmesg: ----------
> Uniform Multi-Platform E-IDE driver Revision: 6.31
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> AMD7409: IDE controller on PCI bus 00 dev 39
> AMD7409: chipset revision 3
> AMD7409: not 100% native mode: will probe irqs later
> AMD7409: disabling single-word DMA support (revision < C4)
> AMD7409: simplex device: DMA forced
> ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:DMA
> hda: IBM-DPTA-372050, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> hda: 40088160 sectors (20525 MB) w/1961KiB Cache, CHS=2495/255/63
> --------------------------
> hylke:/home/hylke# hdparm -v /dev/hda
>
> /dev/hda:
> multcount = 16 (on)
> I/O support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 0 (off)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 2495/255/63, sectors = 40088160, start = 0
> hylke:/home/hylke# hdparm -d1 /dev/hda
>
> /dev/hda:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Operation not permitted
> using_dma = 0 (off)
> hylke:/home/hylke# hdparm -tT /dev/hda
>
> /dev/hda:
> Timing buffer-cache reads: 128 MB in 0.90 seconds =142.22 MB/sec
> Timing buffered disk reads: 64 MB in 12.59 seconds = 5.08 MB/sec
> -------------------------
>
> My harddisk speed is down to 25%...
>
> Greets,
> Hylke van der Schaaf
>
>
> --
> Hi, I'm a signature virus. plz set me as your signature and help me
> spread :)
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>
Andre Hedrick
Linux ATA Development
ASL Kernel Development
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