Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sat, 16 Dec 2006 11:13:20 -0500 | From | Jeff Garzik <> | Subject | Re: SATA DMA problem (sata_uli) |
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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 <alan@redhat.com>
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.
Jeff
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