Subject: Re: tangent: bounce buffers.
To: Daniel Hagerty <email@example.com>
From: Theo de Raadt <firstname.lastname@example.org>
Date: 09/18/1996 16:24:27
> > I've already gotten mail suggesting I switch to OpenBSD. Well, I'm
> > not currently looking at this solution, but why can't we have a
> > machine dependent bounce buffer solution while we wait for a machine
> > independent solution. It's not like we don't have other machine
> > dependent code.
> Umm, since no one seems to have pointed it out.... Just cuz it
> ain't in the master tree doesn't mean it doesn't exist. ISA DMA has
> been available for NetBSD for some time; I was using it in my 32MB 486
> with an aha1542 without any difficulty for a couple of months. I
> don't know if its actively being maintained at this point, but you can
> get it from ftp://bseis.eis.cs.tu-bs.de/pub/hannken/isadma-patch.
That's the patch directly out of OpenBSD. Juergen Hannken-Illjes (the
author) worked with us OpenBSD folk to integrate that patch into
OpenBSD. David Mazieres and I put some work into that too, to solve a
few rough edges. I can't say how well it will work in NetBSD; it's
not trivial stuff.
But it does work very well, and performance is great, and a lot of
really valuable OpenBSD developers use aha controllers on their
I predict the same discussion comes up next week about ATAPI cdrom.
And the answer will be the same.