* Re: No DMA with ATAPI devices on PDC20267
[not found] <01061020334400.00543@cantoris>
@ 2001-06-10 19:43 ` Andre Hedrick
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From: Andre Hedrick @ 2001-06-10 19:43 UTC (permalink / raw)
To: Stephen Mollett; +Cc: linux-kernel
On Sun, 10 Jun 2001, Stephen Mollett wrote:
> Greetings,
>
> When using ATAPI devices on a Promise Ultra100 (PDC20267), DMA is not
> enabled. Is this a bug in the pdc202xx driver or a limitation of the chipset?
>
> eg.
> With the drive attached to a VIA 82C686:
> hdb: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache, UDMA(25)
>
> With the drive attached to an Ultra100:
> hde: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache
>
> I have also tested this with a DVD-ROM and an LS-120 drive. Hard disks are
> fine, however.
>
> Regards,
> Stephen Mollett
>
Stephen,
I can make it do DMA ATAPI, however I have to add the code that used the
second DMA engine space.
Andre Hedrick
ASL Kernel Development
Linux ATA Development
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