Messages in this thread | | | Date | Thu, 21 Oct 2004 18:22:44 +0200 | From | Jens Axboe <> | Subject | Re: readcd hangs in blk_execute_rq |
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On Thu, Oct 21 2004, Meelis Roos wrote: > > > > > ide-cd: cmd 0x28 timed out > > > > > hdc: DMA interrupt recovery > > > > > hdc: lost interrupt > > > > > hdc: status timeout: status=0xd0 { Busy } > > > > > hdc: status timeout: error=0x00 > > > > > hdc: DMA disabled > > > > > hdc: drive not ready for command > > > > > hdc: ATAPI reset complete > > > > It worked in earlier 2.4 kernels (2.4.18?) with DMA - I don't remember > > > if it had some reliability problems. Since then, it's no dma. We have 3 > > > such computers here (Intel D816EEA2 mainboard, this specific Sony CDrom) > > > and they all behave the same. > > > > 2.4.x never used dma for this operation. Does 2.6.9 work if you turn off > > dma first? > > I have not tried this operation before. Reading data disks with DMA > worked and that's what I have used. I did read the same disk with > readdisk subcommand on readcd currently, it was successful until the end > of disk (6xx MB - maybe the end of the disk).
Yes you are right, readcd should use dma.
> Will try it with turning DMA off first.
Ok
-- Jens Axboe
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