From: "Gerhard Pircher" <gerhard_pircher@gmx•net>
To: Eugene Surovegin <ebs@ebshome•net>
Cc: linuxppc-dev@ozlabs•org, debian-powerpc@lists•debian.org
Subject: Re: Not coherent cache DMA for G3/G4 CPUs: clarification needed
Date: Fri, 21 Apr 2006 00:08:18 +0200 (MEST) [thread overview]
Message-ID: <1468.1145570898@www002.gmx.net> (raw)
In-Reply-To: 20060420215514.GE25755@gate.ebshome.net
> --- Ursprüngliche Nachricht ---
> Von: Eugene Surovegin <ebs@ebshome•net>
> An: Gerhard Pircher <gerhard_pircher@gmx•net>
> Kopie: linuxppc-dev@ozlabs•org, debian-powerpc@lists•debian.org
> Betreff: Re: Not coherent cache DMA for G3/G4 CPUs: clarification needed
> Datum: Thu, 20 Apr 2006 14:55:14 -0700
>
> Well, you aren't the first person who tries to run G4 with
> CONFIG_NOT_COHERENT_CACHE. This was done before and I don't remember
> that those people had to implement anything as complex as you are
> trying to do.
Maybe these systems have cache coherent northbridges, which is not the case
for the AmigaOne and its "famous" ArticiaS northbridge.
> You can try asking on #mklinux. It always better to ask people who
> actually _did_ this :).
>
> In fact, I just grepped 2.6 and found
> #ifdef(CONFIG_NOT_COHERENT_CACHE) in syslib/mv64x60.c. Guess what
> systems usually have this type of bridge? Not 4xx/8xx, that's for sure.
Hmm, strange. AFAIK the NOT_COHERENT_CACHE config option is available only
for the 4xx and 8xx platforms. Wouldn't the config option depend on
CONFIG_6XX too, if there are not cache coherent systems with G4 cpus?
At least I could not compile in the dma-mapping.c file without modifying the
Kconfig file.
> Good luck.
Thanks!
Gerhard
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next prev parent reply other threads:[~2006-04-20 22:08 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-20 18:57 Not coherent cache DMA for G3/G4 CPUs: clarification needed Gerhard Pircher
2006-04-20 20:38 ` Eugene Surovegin
2006-04-20 20:56 ` Gerhard Pircher
2006-04-20 21:02 ` Eugene Surovegin
2006-04-20 21:10 ` Gerhard Pircher
2006-04-20 21:55 ` Eugene Surovegin
2006-04-20 22:08 ` Gerhard Pircher [this message]
2006-04-24 19:21 ` Mark A. Greer
2006-04-21 4:38 ` Benjamin Herrenschmidt
2006-04-21 8:03 ` Gerhard Pircher
2006-04-21 14:33 ` Brent Cook
2006-04-21 21:51 ` Benjamin Herrenschmidt
2006-04-27 21:31 ` Mark A. Greer
2006-04-27 21:53 ` Benjamin Herrenschmidt
2006-04-27 22:08 ` Mark A. Greer
2006-04-29 17:57 ` Gerhard Pircher
2006-04-20 21:06 ` Benjamin Herrenschmidt
2006-04-20 21:13 ` Eugene Surovegin
2006-04-20 21:19 ` Eugene Surovegin
2006-04-20 22:40 ` Benjamin Herrenschmidt
2006-04-20 22:39 ` Benjamin Herrenschmidt
2006-04-20 23:46 ` Gabriel Paubert
2006-04-21 0:09 ` Benjamin Herrenschmidt
2006-04-20 21:33 ` Eugene Surovegin
2006-04-20 22:41 ` Benjamin Herrenschmidt
2006-04-21 8:21 ` Gerhard Pircher
2006-04-20 21:03 ` Benjamin Herrenschmidt
2006-04-20 21:33 ` Gerhard Pircher
2006-04-20 22:07 ` Gabriel Paubert
2006-04-20 22:26 ` Gerhard Pircher
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