On Tue, Oct 18, 2005 at 12:42:54PM -0700, Garrett D'Amore wrote:
> >The IDE driver does too.
> >
> > 
> >
> Really?  I don't see that, all I get are some NICs and the DPT driver.  
> I tried this command:
> 
> find src/sys/dev/ -name '*.[ch]' -print | xargs grep bus_space_read

See sys/dev/ata/ata_wdc.c, sys/dev/ic/wdc.c and sys/dev/scsipi/atapi_wdc.c

> 
> I suspect that doing PIO for larger transfers would want that, but that 
> most modern IDE controllers on non-PC systems would use DMA, and thus 
> not need these routines.

Some commands explicitly use PIO to transfers data (e.g. SMART or IDENTIFY)


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