It seems Steve Ames wrote:
>
> Hrm... no question that the ATA driver is better today, but its still
> not reporting DMA on my Quantum bigfoot drive (which should support DMA:
> http://www.quantum.com/products/archive/bigfoot_cy/bigfoot_cy_features.htm)
>
> The Maxtor is pretty old (But its been current since 3.0 :) but may
> still have some DMA support? (ftp://ftp.maxtor.com/pub/ide/71626ap.txt)
>
> What am I missing?
Drives that report their capabilities right :)
> ad0: <Maxtor 71626 AP/QA3C1D20> ATA-0 disk at ata0 as master
> ad0: 1554MB (3183264 sectors), 3158 cyls, 16 heads, 63 S/T, 512 B/S
> ad0: 16 secs/int, 1 depth queue, PIO
> ad1: <QUANTUM BIGFOOT_CY4320A/A03.0500> ATA-0 disk at ata0 as slave
> ad1: 4134MB (8467200 sectors), 8960 cyls, 15 heads, 63 S/T, 512 B/S
> ad1: 16 secs/int, 1 depth queue, PIO
Both reports "dont care" fields in the ata conformance field
thereby being set as ATA-0 disks. Since I've put in test
to only enable WDMA2 on at least ATA-2 disks and only enable
UDMA2 on at least ATA-3 disks, well your disks are not even
tried. You can change that in ata-disk.c by commenting out the
test for this, they look like: "ad_version(ap->versmajor) >= 2".
I've put them in recently to try to avoid runniing DMA on known
problematic HW, but they will also reject some good ones
regrettably...
-Søren
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