No DMA with ATAPI devices on PDC20267
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Quoted 9 lines · Stephen Mollett
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)
Quoted 9 lines
With the drive attached to an Ultra100:
hde: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB CacheI 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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