Nate Lawson wrote: > 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. If the IO ports for DMA are set wrong or just NULL there will be no DMA, so compare the dmesg from with and without ACPI and check if thats the reason... -SørenReceived on Tue Aug 10 2004 - 18:56:53 UTC
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