Messages in this thread | | | From | Nicholas Wourms <> | Subject | Re: 2.4.21-rc1-ac2 Promise IDE DMA won't work | Date | Tue, 29 Apr 2003 20:21:39 -0400 |
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Tabris wrote: > On Tuesday 29 April 2003 04:15 pm, Andre Hedrick wrote: > >>The Promise chipset use a second DMA engine at offset 0x24 respective >>of the channel. Mixing an ATA and ATAPI on that channel is almost >>impossible to make the corner cases work. Next, if there us a 48-bit >>ATA plus ATAPI on the channel popping between the two enignes does >>not look sane at all because one has to swithc the location of the >>hwif->sgtable. > > > Ok... moved the HDDs from the VIA secondary to the PDC primary (tried > moving both, but it seems that ide=reverse doesn't work), and the > CD-R/W to the VIA secondary. > > good news, regular reads seem to use the DMA engine. bad news, CDDA > ripping (using cdparanoia) does not. > > is this a known issue? (i thought that CDDA ripping had been fixed) >
Have you tried Andrew Morton's ide-cd dma patch? It seems to have worked well for me, at least. A summary of what it does is included at the top of the patch.
http://www.zipworld.com.au/~akpm/linux/patches/2.4/2.4.20/ide-akpm.patch
Perhaps Alan might considier it for the -rc2 ac patch?
Cheers, Nicholas
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