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SubjectRe: No DMA with ATAPI devices on PDC20267
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


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
ASL, Inc. Toll free: 1-877-ASL-3535
1757 Houret Court Fax: 1-408-941-2071
Milpitas, CA 95035 Web:

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