From owner-freebsd-questions  Thu Sep  2 14:35:28 1999
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Date: Thu, 02 Sep 1999 17:42:28 -0400
From: "Mark S. Reichman" <reichman@twcny.rr.com>
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To: Smc659@aol.com
Cc: questions@freebsd.org
Subject: Re: Using UDMA
References: <195b73ac.25003ece@aol.com>
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Make your kernel config look like this and recompile/install new
kernel.  

controller      wdc0    at isa? port "IO_WD1" bio irq 14 flags 0xb0ffb0ff
disk            wd0     at wdc0 drive 0
disk            wd1     at wdc0 drive 1

controller      wdc1    at isa? port "IO_WD2" bio irq 15 flags 0xb0ffb0ff
disk            wd2     at wdc1 drive 0
disk            wd3     at wdc1 drive 1  

Then, watch the boot up messages when these device are detected 
and you should see something like:

wdc0 at 0x1f0-0x1f7 irq 14 flags 0xb0ffb0ff on isa
wdc0: unit 0 (wd0): <WDC AC34300L>, LBA, DMA, 32-bit, multi-block-16
wd0: 4104MB (8406720 sectors), 523 cyls, 255 heads, 63 S/T, 512 B/S
wdc0: unit 1 (wd1): <WDC AC310100B>, LBA, DMA, 32-bit, multi-block-16
wd1: 9671MB (19807200 sectors), 1232 cyls, 255 heads, 63 S/T, 512 B/S
wdc1 at 0x170-0x177 irq 15 flags 0xb0ffb0ff on isa
wdc1: unit 1 (wd3): <WDC AC22000L>, LBA, DMA, 32-bit, multi-block-16            


Notice they say DMA.  I do not know if this extends to UDMA support.


Smc659@aol.com wrote:
> 
> Im currently using FreeBSD-3.2 stable. How do you get UDMA support working
> under FreeBSD? Do I need FreeBSD 4-Current?
> 
> Thanks,
> Sam
> 
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