Re: 2.4.21-rc1-ac2 Promise IDE DMA won't work

[Nicholas Wourms <nwourms@myrealbox.com>]

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