> I suppose you were using ata_piix too in older kernel, right? Can you > post the boot dmesg of 2.6.19? We used to ignore mwdma mode before and > enabled it at some point after that. That may be the cause here. > > Also, please try the attached patch on top of 2.6.20. Sorry guys, I've actually got it wrong. The hardware that I have been testing on has a different chipset: Intel ICH8, to what I was using previously with success with 2.6.19 (this was ICH4 based hardware) - so the driver is actually different now. Tejun, your patch for 2.6.20 failed with the same errors. For completeness I have tested the newer ICH8 hardware with everything from 2.6.15 through to 2.6.21.5 using the ata_piix drivers and it (the Compact Flash) fails in all kernels. Here is the (relevant) dmesg from 2.6.21.5 showing the CF being disabled: ata_piix 0000:00:1f.2: version 2.10ac1 ata_piix 0000:00:1f.2: MAP [ P0 P2 P1 P3 ] ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 19 (level, low) -> IRQ 19 PCI: Setting latency timer of device 0000:00:1f.2 to 64 ata1: SATA max UDMA/133 cmd 0x0001fa00 ctl 0x0001f902 bmdma 0x0001f600 irq 19 ata2: SATA max UDMA/133 cmd 0x0001f800 ctl 0x0001f702 bmdma 0x0001f608 irq 19 scsi0 : ata_piix ata1.00: ATA-0: CF CARD 512MB, 20070131, max MWDMA2 ata1.00: 990864 sectors, multi 0: LBA ata1.00: applying bridge limits ata1.00: configured for MWDMA2 scsi1 : ata_piix ATA: abnormal status 0x7F on port 0x0001f807 scsi 0:0:0:0: Direct-Access ATA CF CARD 512MB 2007 PQ: 0 ANSI: 5 SCSI device sda: 990864 512-byte hdwr sectors (507 MB) sda: Write Protect is off sda: Mode Sense: 00 3a 00 00 SCSI device sda: write cache: disabled, read cache: enabled, doesn't support DPO or FUA SCSI device sda: 990864 512-byte hdwr sectors (507 MB) sda: Write Protect is off sda: Mode Sense: 00 3a 00 00 SCSI device sda: write cache: disabled, read cache: enabled, doesn't support DPO or FUA sda:<3>ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen ata1.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 in res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) ata1: port is slow to respond, please be patient (Status 0xd0) ata1: port failed to respond (30 secs, Status 0xd0) ata1: soft resetting port ata1.00: failed to IDENTIFY (INIT_DEV_PARAMS failed, err_mask=0x80) ata1.00: revalidation failed (errno=-5) ata1: failed to recover some devices, retrying in 5 secs ata1: soft resetting port ata1.00: failed to IDENTIFY (INIT_DEV_PARAMS failed, err_mask=0x80) ata1.00: revalidation failed (errno=-5) ata1.00: limiting speed to MWDMA2:PIO3 ata1: failed to recover some devices, retrying in 5 secs ata1: soft resetting port ata1.00: failed to IDENTIFY (INIT_DEV_PARAMS failed, err_mask=0x80) ata1.00: revalidation failed (errno=-5) ata1.00: disabled ata1: EH complete sd 0:0:0:0: SCSI error: return code = 0x00040000 end_request: I/O error, dev sda, sector 0 Here is the lspci -v for the controller: 00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port SATA IDE Controller (rev 02) (prog-if 8f [Master SecP SecO PriP PriO]) Subsystem: Intel Corporation 82801H (ICH8 Family) 4 port SATA IDE Controller Flags: bus master, 66Mhz, medium devsel, latency 0, IRQ 19 I/O ports at fa00 [size=8] I/O ports at f900 [size=4] I/O ports at f800 [size=8] I/O ports at f700 [size=4] I/O ports at f600 [size=16] I/O ports at f500 [size=16] Capabilities: [70] Power Management version 3 Please let me know if there is any further information I can provide to help fix this issue. Thanks, - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html