Hi.

I'm having great difficulty solving a problem I've encountered. I have a Promise Fastrak TX4000 card:

0000:00:08.0 RAID bus controller: Promise Technology, Inc. PDC20619 (FastTrak TX4000) (rev 02)
Subsystem: Promise Technology, Inc. PDC20619 (FastTrak TX4000)
Flags: bus master, 66MHz, medium devsel, latency 96, IRQ 137

For some strange reason all drives are set to UDMA/33 mode when the module is loaded and I haven't found a way of changing the UDMA mode (hdparm -X doesn't work: HDIO_DRIVE_CMD(setxfermode) failed: Input/output error).

Extract from dmesg:

libata version 1.20 loaded.
sata_promise 0000:00:08.0: version 1.04
ata1: PATA max UDMA/133 cmd 0xF8ABC200 ctl 0xF8ABC238 bmdma 0x0 irq 137
ata2: PATA max UDMA/133 cmd 0xF8ABC280 ctl 0xF8ABC2B8 bmdma 0x0 irq 137
ata3: PATA max UDMA/133 cmd 0xF8ABC300 ctl 0xF8ABC338 bmdma 0x0 irq 137
ata4: PATA max UDMA/133 cmd 0xF8ABC380 ctl 0xF8ABC3B8 bmdma 0x0 irq 137
ata1: disabling port
scsi1 : sata_promise
ata2: dev 0 cfg 49:2f00 82:346b 83:7f01 84:4003 85:3469 86:3c01 87:4003 88:203f
ata2: dev 0 ATA-6, max UDMA/100, 312581808 sectors: LBA48
ata2: dev 0 configured for UDMA/33
scsi2 : sata_promise
ata3: dev 0 cfg 49:2f00 82:746b 83:7f01 84:4633 85:7469 86:3c01 87:4623 88:203f
ata3: dev 0 ATA-7, max UDMA/100, 312581808 sectors: LBA48
ata3: dev 0 configured for UDMA/33
scsi3 : sata_promise
ata4: dev 0 cfg 49:2f00 82:346b 83:7f01 84:4003 85:3469 86:3c01 87:4003 88:203f
ata4: dev 0 ATA-6, max UDMA/100, 312581808 sectors: LBA48
ata4: dev 0 configured for UDMA/33
scsi4 : sata_promise
Vendor: ATA Model: WDC WD1600JB-00E Rev: 15.0
Type: Direct-Access ANSI SCSI revision: 05
Vendor: ATA Model: WDC WD1600JB-00R Rev: 20.0
Type: Direct-Access ANSI SCSI revision: 05
Vendor: ATA Model: WDC WD1600JB-00E Rev: 15.0
Type: Direct-Access ANSI SCSI revision: 05

I'm currently running kernel 2.6.17.3. In the controller's BIOS I've created 3 'stripe' arrays with 1 disk per array, the BIOS shows the 3 drives as U5 (UDMA mode 5 - which is UDMA/100 right?).

I've searched high and low but haven't found an answer to this problem. Help appreciated. Please

Regards,