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Date: Wed, 10 Nov 2004 23:31:45 +0100
From: Sebastian Holmqvist <sebastian.holmqvist@gmail.com>
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Subject: FBSD 5.3 | Wrong DMA mode freezes the system?
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I have 2 discs on my Sata-controller card.
It's fully supported by FBSD but when it's handling alot of data, the
whole machine hangs.

I checked with atacontrol and my discs were SATA150, but the documentation says:
Currently supported modes are: BIOSDMA, PIO0 (alias BIOSPIO), PIO1,
PIO2, PIO3, PIO4, WDMA2, UDMA2 (alias UDMA33), UDMA4 (alias UDMA66),
UDMA5 (alias UDMA100) and UDMA6 (alias UDMA133).

Could this have something to do with it?

I found this: http://lists.freebsd.org/pipermail/freebsd-bugs/2003-August/002921.html
Looks pretty much like my problem, only that I use the SATA-ports
instead of the PATA on the card.
-- 

Sebastian Holmqvist
Webprogrammer / HL2 modder
http://cae.hl2files.com