Radek Kozlowski wrote: > On Fri, Aug 06, 2004 at 03:31:06PM -0700, Nate Lawson wrote: > >>It looks like the DMA object for the channel is not being initialized. >>However, that is in another path (this backtrace is just a symptom >>triggered by the first DMA access to the drive). Someone who knows more >>about the control path for going from PIO -> DMA mode will have to look >>into this. > > I would like to stress that it only happens with ACPI enabled. If I boot > with ACPI disabled the transfer mode is set to UDMA100. Shall I provide > you with more info? I'm done debugging ATA for now. I spent 8 hours tracking down the first bug (not counting the time lost tracking down a non-existent routing table bug triggered by the ATA bug) and 15 minutes on the second one. ACPI does not affect ATA other than setting up IO ports and IRQs. I have no idea what can cause ATA to use PIO over UDMA. -- NateReceived on Tue Aug 10 2004 - 18:43:45 UTC
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