Jeff Garzik wrote: > Alan wrote: >>> I tracked it down to one of the drives being forced into PIO4 mode >>> rather than UDMA mode; dmesg bits: >>> ata4.00: ATA-7, max UDMA/133, 586072368 sectors: LBA48 NCQ (depth 0/32) >>> ata4.00: ata4: dev 0 multi count 16 >>> ata4.00: simplex DMA is claimed by other device, disabling DMA >> >> Your ULi controller is reporting that it supports UDMA upon only one >> channel at a time. The kernel is honouring this information. The older >> ULi (was ALi) PATA devices report simplex but let you turn it off so >> see if the following does the trick. Test carefully as always with >> disk driver >> changes. >> >> (Jeff probably best to check the docs before merging this but I believe >> it is sane) >> >> Signed-off-by: Alan Cox <[EMAIL PROTECTED]> > > My Uli SATA docs do not appear to cover the bmdma registers :( Only the > PCI config registers. > > But regardless, I think the better fix is to never set ATA_HOST_SIMPLEX > if ATA_FLAG_NO_LEGACY is set. > > None of the SATA controllers I've ever encountered has been simplex.
Just another data point. The same problem is reported by bug #7590. http://bugzilla.kernel.org/show_bug.cgi?id=7590 Is somebody brewing a patch? -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
