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.
Jeff
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