Re: Quirk WD_QUIRK_SPLIT_MOD15_WRITE

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sat, Dec 05, 2009 at 01:53:21PM +0000, David Laight wrote:
> sys/dev/ata/wd.c has some very strange code for the
> WD_QUIRK_SPLIT_MOD15_WRITE quirk.
> 
> The code splits in two any transfers where the 'sector_count % 15 == 1'.
> It appears to do this by dividing the byte transfer size in two.
> This is fine for 16 sector transfers (converts one 16k byte transfer
> into two 8k transfers), but it next applies to 31 sector transfers and
> I can't help thinking that the requests for 15.5 sectors aren't going
> to be processed correctly!

Actually it will: the first request will be 15 sectors, the
second one 15 and the last one 1.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--