Re: No DMA with ATAPI devices on PDC20267

Re: No DMA with ATAPI devices on PDC20267

[Andre Hedrick]

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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