Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 29 Sep 2005 09:56:33 +0200 | From | Matteo Brusa <> | Subject | libata/ata_piix stuck in combined mode |
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Hi, I'm running Sarge on a Dell PE 750, official Debian kernel 2.6.8-2-686, with 2 SATA disks. The disk controller is an Intel ICH5. Since I upgraded from kernel 2.4 to 2.6, the DMA disk access doesn't work anymore, because libata and ata_piix goes in combined mode:
# grep -i ata /var/log/dmesg BIOS-e820: 000000003ffc0000 - 000000003ffcfc00 (ACPI data) Memory: 1031108k/1048320k available (1551k kernel code, 16284k reserved, 690k data, 148k init, 130816k highmem) libata version 1.02 loaded. ata_piix version 1.02 ata_piix: combined mode detected ata1: PATA max UDMA/33 cmd 0x1F0 ctl 0x3F6 bmdma 0xFEA0 irq 14 ata1: dev 0 cfg 49:0f00 82:0000 83:0000 84:0000 85:0000 86:0000 87:0000 88:0407 ata1: dev 0 ATAPI, max UDMA/33 ata1: dev 0 configured for UDMA/33 scsi0 : ata_piix ata2: SATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xFEA8 irq 15 ata2: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:207f ata2: dev 0 ATA, max UDMA/133, 156250000 sectors: ata2: dev 0 configured for UDMA/133 scsi1 : ata_piix Vendor: ATA Model: Maxtor 6Y080M0 Rev: YAR5 EXT3-fs: mounted filesystem with ordered data mode.
I've read some posts here about disabling the PATA/SATA mixed mode in the BIOS; too bad there's no such a switch in Dell servers. I tried to disable the IDE cdrom in the BIOS, with no luck. Also kernel 2.6.12 from Knoppix 4.0.2 couldn't help. Is there a way to force the ata_piix module out of combined mode?
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