(CCing linux-ide) On 01/05/2011 12:33 PM, Stephen Clark wrote:
Hello, Why is the kernel limiting me to udma/33 when the device says it can do ata2.01: CFA: TRANSCEND, 20070831, max UDMA/66 There is no cable the compact flash is a socket on the motherboard!
The kernel has no way to know that, and presumably the board isn't connecting the signal for IDE pin 34 to ground in order to properly signal that an 80-wire cable (or equivalent) is connected so that speeds over UDMA33 can be used.
You should be able to use the libata.force=80c option on the kernel command line to override the cable detection.
Loading sd_mod.ko module Loading libata.ko module Loading ata_generic.ko module Loading pata_acpi.ko module pata_acpi 0000:00:0f.0: PCI INT B -> GSI 21 (level, low) -> IRQ 21 pata_acpi 0000:00:0f.0: PCI INT B disabled Loading pata_via.ko module scsi0 : pata_via scsi1 : pata_via ata1: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xfa00 irq 14 ata2: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xfa08 irq 15 ata2.01: CFA: TRANSCEND, 20070831, max UDMA/66 ata2.01: 7962192 sectors, multi 0: LBA ata2.01: limited to UDMA/33 due to 40-wire cable ata2.01: configured for UDMA/33 scsi 1:0:1:0: Direct-Access ATA TRANSCEND 2007 PQ: 0 ANSI: 5 sd 1:0:1:0: [sda] 7962192 512-byte logical blocks: (4.07 GB/3.79 GiB) sd 1:0:1:0: [sda] Write Protect is off sd 1:0:1:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DA sda: sda1 sda2 sda3 sd 1:0:1:0: [sda] Attached SCSI disk Loading ata_piix.ko module Thanks, Steve
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