Subject: Re: No IDE-DMA after sup today ("no driver support")...
To: Guenther Grau <Guenther.Grau@bk.bosch.de>
From: Perry E. Metzger <email@example.com>
Date: 10/21/1998 11:47:42
Guenther Grau writes:
> > This was with a PIIX4. Maybe some other controllers have a more fair
> > behavior. But I think it's better to say "your disk is used in PIO
> > mode because the pciide driver doesn't support your controller" than
> > "your machine hang when you try to install NetBSD on it because
> > the pciide driver doesn't support your controller".
> I agree with you! However, wouldn't it be possible to to have a
> config option to enable DMA anyways? This would be turned off
> by default. If the user is running NetBSD and wants to try the benefits
> of DMA, he might just try to turn this option on and see what
> happens on his computer. The implications of this option should
> be clearly marked. Doing this wouldn't impose any limits on the
> users, but I don't know if this is possible with the code you
This would be really good. Then most of us could try to use DMA and if
it failed, we could always back out.