Re: dma fails with kernel 2.4.21

[Kristian Peters <kristian.peters@korseby.net>]

Anthony Campbell <ac@acampbell.org.uk> schrieb:
> I had dma running with kernel 2.4.20. On 2.4.21 hdparm gives an error:
> 
> 	HDIO_SET_DMA failed
> 
> Anyone know why this is or what has changed between the two kernels?

Do you have CONFIG_IDEDMA_AUTO or CONFIG_IDEDMA_ONLYDISK enabled ? Try to disable "Use PCI DMA by default when available". That should work.

btw: I can't get my cdrom work in DMA mode. I'm getting:

kernel: scsi : aborting command due to timeout : pid 33, scsi0, channel 0, id 0, lun 0 Read (10) 00 00 00 00 10 00 00 01 00 
kernel: hdb: DMA interrupt recovery
kernel: hdb: lost interrupt
kernel: hdb: status timeout: status=0xd0 { Busy }
kernel: hdb: DMA disabled
kernel: hdb: drive not ready for command
kernel: hdb: ATAPI reset complete
kernel:  I/O error: dev 0b:00, sector 68
kernel: isofs_read_super: bread failed, dev=0b:00, iso_blknum=17, block=17

Or using ide-cd instead of ide-scsi:

kernel: hdb: DMA interrupt recovery
kernel: hdb: lost interrupt
kernel: hdb: status timeout: status=0xd0 { Busy }
kernel: hdb: status timeout: error=0x00
kernel: hdb: DMA disabled
kernel: hdb: drive not ready for command
kernel: hdb: ATAPI reset complete

Everything works fine in PIO mode. In 2.4.20 and earlier kernels I hadn't any problems so far.

*Kristian 

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