ATAng still causing a lot of pain.

[Kirk Strauser]

Further details:

The ATA drive in questions is:

    ad0: 114473MB <WDC WD1200JB-00DUA3> [232581/16/63] at ata0-master PIO4

The PIO4 comes from booting with 'hw.ata.ata_dma="0"'; it would otherwise be
"UDMA66".

Basically, if I use atacontrol to set that channel to WDMA2 or below, then I
get no errors (but performance is awful).  At UDMA2 I been to see "TIMEOUT -
WRITE_DMA" and "TIMEOUT - READ_DMA" messages, but the system recovers.  At
UDMA4 and above, the kernel panics.
-- 
Kirk Strauser

"94 outdated ports on the box,
 94 outdated ports.
 Portupgrade one, an hour 'til done,
 82 outdated ports on the box."
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