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SubjectRe: CONFIG_BLK_DEV_SL82C105 should not be PPC/ARM specific
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That patch (plus bludgeoning the config) certainly *works* on this
chipset, but it doesn't get DMA support; logs follow. If I run hdparm
to put it into using_dma mode, and then try to access it, using_dma
mode gets turned off after some delay...

Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
W82C105: IDE controller on PCI bus 00 dev 10
PCI: No IRQ known for interrupt pin A of device 00:02.0. Probably
buggy MP table.
W82C105: chipset revision 6
W82C105: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xfcd0-0xfcd7, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xfcd8-0xfcdf, BIOS settings: hdc:DMA, hdd:DMA
hda: Maxtor 4W100H6, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: 195711264 sectors (100204 MB) w/2048KiB Cache, CHS=194158/16/63,
(U)DMA
hda:hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
LDM: DEBUG (ldm.c, 876): validate_partition_table: Found basic MS-DOS
partition, not a
dynamic disk.
hda1 hda2

# hdparm -v /dev/hda

/dev/hda:
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 63086/16/63, sectors = 195711264, start = 0
# hdparm -t /dev/hda

/dev/hda:
Timing buffered disk reads: 64 MB in 57.65 seconds = 1.11 MB/sec
# hdparm -v /dev/hda

/dev/hda:
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 1 (on)
using_dma = 0 (off)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 63086/16/63, sectors = 195711264, start = 0
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