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SubjectPromise IDE on Alpha
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Hello,

I have a Promise PDC20268 IDE controller in a PWS433au Alpha machine.

With kernel 2.4.18 it works, but only at UDMA3 which must be forced with
hdparm. UDMA4/5 can be set with hdparm, but at any disk access there are
some errors and the mode is dropped to UDMA3.

I tried 2.4.19-pre8 in the hope that it would work better. It does
correctly detect the drive as UDMA capable but only UDMA2. The higher
modes can't be set with hdparm. I found out that this was because a
udma_four flag in some struct wasn't set. I changed pdc2026xx.c and
set this flag and could set UDMA3. The better modes were still broken.

Is this Alpha specific or a generic driver problem?

dmesg output with original 2.4.19-pre8:
Linux version 2.4.19-pre8 (mru@zaphod) (gcc version 3.0.4) #1 Sun May 5 11:44:45 CEST 2002
Booting on Miata using machine vector Miata from SRM
[snip]
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
CMD646: IDE controller on PCI bus 00 dev 20
CMD646: detected chipset, but driver not compiled in!
CMD646: chipset revision 1
CMD646: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0x8080-0x8087, BIOS settings: hda:pio, hdb:pio
ide1: BM-DMA at 0x8088-0x808f, BIOS settings: hdc:pio, hdd:pio
PDC20268: IDE controller on PCI bus 00 dev 60
PDC20268: chipset revision 2
PDC20268: not 100% native mode: will probe irqs later
PDC20268: ROM enabled at 0x09074000
ide2: BM-DMA at 0x8090-0x8097, BIOS settings: hde:pio, hdf:pio
ide3: BM-DMA at 0x8098-0x809f, BIOS settings: hdg:pio, hdh:pio
hde: ST340810A, ATA DISK drive
hdg: SAMSUNG COMBO SM-304B, ATAPI CD/DVD-ROM drive
ide2 at 0x80a0-0x80a7,0x80b2 on irq 32
ide3 at 0x80a8-0x80af,0x80b6 on irq 32
hde: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=77545/16/63, UDMA(33)
Partition check:
/dev/ide/host2/bus0/target0/lun0: unknown partition table
[snip]
ide2: Speed warnings UDMA 3/4/5 is not functional. << Caused by hdparm

dmesg output with my changes:
Linux version 2.4.19-pre8 (mru@zaphod) (gcc version 3.0.4) #2 Sun May 5 17:54:12 CEST 2002
Booting on Miata using machine vector Miata from SRM
[snip]
pci: passed tb register update test
pci: passed sg loopback i/o read test
pci: passed pte write cache snoop test
pci: failed valid tag invalid pte reload test (mcheck; workaround available)
pci: passed pci machine check test
pci: tbia workaround enabled
pci: pyxis 8K boundary dma bug - sg dma disabled
[snip]
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
CMD646: IDE controller on PCI bus 00 dev 20
CMD646: detected chipset, but driver not compiled in!
CMD646: chipset revision 1
CMD646: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0x8080-0x8087, BIOS settings: hda:pio, hdb:pio
ide1: BM-DMA at 0x8088-0x808f, BIOS settings: hdc:pio, hdd:pio
PDC20268: IDE controller on PCI bus 00 dev 60
PDC20268: chipset revision 2
PDC20268: not 100% native mode: will probe irqs later
PDC20268: ROM enabled at 0x09074000
ide2: BM-DMA at 0x8090-0x8097, BIOS settings: hde:pio, hdf:pio
ide3: BM-DMA at 0x8098-0x809f, BIOS settings: hdg:pio, hdh:pio
hde: ST340810A, ATA DISK drive
hdg: SAMSUNG COMBO SM-304B, ATAPI CD/DVD-ROM drive
ide2 at 0x80a0-0x80a7,0x80b2 on irq 32
ide3 at 0x80a8-0x80af,0x80b6 on irq 32
hde: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=77545/16/63, UDMA(100)
Partition check:
/dev/ide/host2/bus0/target0/lun0:hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
PDC202XX: Primary channel reset.
ide2: reset: success
hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
hde: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hde: dma_intr: error=0x84 { DriveStatusError BadCRC }
PDC202XX: Primary channel reset.
ide2: reset: success
unknown partition table


--
Måns Rullgård
mru@users.sf.net
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