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SubjectRe: DMA and my Maxtor drive
At 06:43 PM 10/20/2000, wrote:

>I get this when DMA is enabled:
>Oct 20 15:39:07 cr753963-a kernel: hdb: timeout waiting for DMA
>Oct 20 15:39:07 cr753963-a kernel: hdb: irq timeout: status=0x6e {
>DriveReady DeviceFault DataRequest CorrectedError Index }
>ide0: reset: success
>Oct 20 15:39:07 cr753963-a kernel: hdb: DMA disabled
>Oct 20 15:39:07 cr753963-a kernel: ide0: reset: success
>It only happens when there lots of data is being transferred, or compiled
>on the drive.. The drive status is this:
> Model=Maxtor 82560A4, FwRev=AA8Z2726, SerialNo=C40LTQGA
> Config={ Fixed }
> RawCHS=4962/16/63, TrkSize=0, SectSize=0, ECCbytes=20
> BuffType=DualPortCache, BuffSize=256kB, MaxMultSect=16, MultSect=off
> CurCHS=4962/16/63, CurSects=5001696, LBA=yes, LBAsects=5001728
> IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
> PIO modes: pio0 pio1 pio2 pio3 pio4
> DMA modes: mdma0 mdma1 *mdma2

The same thing happens with big Seagates. It is linux specific. its been a
problem for a long time.

the problem doesnt occur with Western Digital drives, whatever it is.

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