Re: DMA mode selection question

On Tue, Apr 03, 2007 at 01:40:18PM -0700, jeffwpdxlug.org wrote:
> Hi all,
> I've got an older i386 (PI) with an IDE drive that
supports Ultra33, and
> for which NetBSD (3.1) aggrees yet sets the drive to
the next mode down:
> 
> # dmesg | grep wd0
> wd0 at atabus0 drive 0: <FUJITSU MPB3043ATU>
> wd0: drive supports 16-sector PIO transfers, LBA
addressing
> wd0: 4125 MB, 8940 cyl, 15 head, 63 sec, 512 bytes/sect
x 8448300 sectors
> wd0: 32-bit data port
> wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA
mode 2 (Ultra/33)
> wd0(piixide0:0:0): using PIO mode 4, DMA mode 2 (using
DMA)
> boot device: wd0
> root on wd0a dumps on wd0b
> 
> The IDE controller is an on-board Intel 82371SB IDE
Interface (PIIX3)
> (rev. 0x00) and the IDE cable is a std
40-pin/40-conductor which should
> be fine up to Ultra33 speeds.  The kernel is just a
paired down GENERIC
> with the wd(4) flag set to 0x0000 ( uses whatever mode
the drive says it
> supports). Any idea why the drivve isn't getting the
highest supported
> setting?

Well, because the IDE controller doesn't support it...

-- 
Quentin Garnier - cubecubidou.net - cubeNetBSD.org
"You could have made it, spitting out benchmarks
Owe it to yourself not to fail"
Amplifico, Spitting Out Benchmarks, Hometakes Vol. 2,
2005.