Subject: Re: problems with 1.6ZE
To: None <email@example.com>
From: David Laight <firstname.lastname@example.org>
Date: 11/02/2003 18:39:26
> > Could you try to force it to 1-sector PIO transfer ?
> > Just force wd->sc_multi to 1 in wd.c:wdattach() line 326
> This fixes the problem. So I guess the Samsung cards are lying when they
> claim to support 4-sector transfers? Or is there a bug in the NetBSD driver
> or something?
(not having looked at the code)
What does 'wd->sc_multi' control?
IIRC there are two different commands, one for 'normal' reads and one
for multi-sector reads. However a 'normal' read command can transfer
The multi-sector read reduces the number of interrupts by transferring
data in blocks of sectors (instead of single sectors).
I wouldn't have thought that multi-sector reads would make a big difference.
(Interestingly I did find it worth taking the interrupts for read data
on CF cards - you might think it would be worth polling...)
David Laight: email@example.com