From: Paul Mackerras <paulus@cs.anu.edu.au>
To: linuxppc-dev@lists.linuxppc.org
Cc: Hubert.Figuiere@solsoft.fr
Subject: Re: Porting to NuBus PowerMacs
Date: Wed, 13 Jan 1999 10:32:49 +1100 [thread overview]
Message-ID: <199901122332.KAA15373@tango.anu.edu.au> (raw)
In-Reply-To: <Pine.LNX.3.96.990112141237.3746A-100000@globegate.utm.edu> (marsmail@globegate.utm.edu)
David A. Gatwood <marsmail@globegate.utm.edu> wrote:
> Beyond that, it will also require changes to irq.c to handle the interrupt
> controller and a lot of code for DMA, if that's desired (I don't think
> it's even remotely similar, AFAICT). Of course, that stuff can be
> obtained from Mach, but it'll be a lot of work. Oh, and the i/o base
I gather that DMA is not cache-coherent on the NuBus powermacs, which
opens a whole new can of worms... it means you have to do explicit
flush/invalidate requests, but it also means that you *have* to make
sure that the cpu isn't accessing any words in any of the cache lines
that the dma controller is accessing. If the dma buffer isn't
cacheline-aligned, and is preceded or followed by unrelated stuff, you
are in trouble.
Paul.
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next prev parent reply other threads:[~1999-01-12 23:32 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-12 15:26 Porting to NuBus PowerMacs Hubert Figuiere
1999-01-12 19:29 ` Benjamin Herrenschmidt
1999-01-13 0:12 ` David A. Gatwood
1999-01-13 4:17 ` Dan Malek
1999-01-13 9:40 ` Hubert Figuiere
1999-01-13 16:18 ` Gary Thomas
1999-01-13 16:25 ` Hubert Figuiere
1999-01-13 17:27 ` [OT] " Geert Uytterhoeven
1999-01-13 20:07 ` David A. Gatwood
1999-01-13 18:55 ` David A. Gatwood
1999-01-14 18:15 ` Jules Bean
1999-01-14 18:33 ` Michael Schmitz
1999-01-14 20:18 ` David A. Gatwood
1999-01-12 20:31 ` a sun
1999-01-13 19:21 ` David A. Gatwood
1999-01-13 19:27 ` David A. Gatwood
1999-01-14 4:09 ` a sun
1999-01-14 4:23 ` David A. Gatwood
1999-01-14 2:12 ` Troy Benjegerdes
1999-01-14 11:12 ` Benjamin Herrenschmidt
1999-01-12 20:31 ` David A. Gatwood
1999-01-12 23:32 ` Paul Mackerras [this message]
1999-01-13 21:14 ` Tom Vier
-- strict thread matches above, loose matches on Subject: below --
1999-01-13 5:40 Ron Nelson
1999-01-13 21:22 ` Tom Vier
1999-01-13 13:57 Kaoru Fukui
1999-01-14 15:24 Porting to Nubus PowerMacs Alexander Gustav Deucher
1999-01-14 22:37 ` Gabriel Paubert
1999-01-15 9:03 ` Troy Benjegerdes
1999-01-15 11:09 ` Gabriel Paubert
1999-01-15 16:12 ` Alois Fertl
1999-01-15 19:36 ` Cort Dougan
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