From: Segher Boessenkool <segher@kernel.crashing.org>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: linuxppc-dev <Linuxppc-dev@ozlabs.org>,
Dale Farnsworth <dfarnsworth@mvista.com>,
Yoder Stuart-B08248 <stuart.yoder@freescale.com>
Subject: Re: [RFC 3/3] powerpc: Add DTS file for the Motorola PrPMC2800 platform
Date: Thu, 29 Mar 2007 02:48:47 +0200 [thread overview]
Message-ID: <2cd6c2dd69700dd162e90f8b7a83a99d@kernel.crashing.org> (raw)
In-Reply-To: <20070329003550.GB25652@localhost.localdomain>
> That does seem like a lot. The only thing that should need
> virtual-reg properties is serial ports. In fact, specifically, only
> serial ports that the zImage is actually expected to use.
>
> In fact, with Scott's addition of xlate_reg() to the bootwrapper,
> virtual-reg should only be needed on systems that enter the zImage
> with MMU on.
Even then, you can just query the MMU structures to
find out the currently set up translations for that
physical address. Way more robust.
The only valid reason to use "virtual-reg" is as a
hack to map some device to get some debug output out.
If for normal usage you can't be bothered to parse
the current translations, you probably shouldn't be
doing anything as "advanced" as device I/O either --
just boot the kernel and let it handle it ;-)
That said, I sure hope the kernel isn't using this
property as well...
Segher
next prev parent reply other threads:[~2007-03-29 0:48 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-28 1:19 [RFC 0/3] powerpc: Add Motorola PrPMC2800 platform support Mark A. Greer
2007-03-28 1:20 ` [RFC 1/3] powerpc: Add bootwrapper support for Motorola PrPMC2800 platform Mark A. Greer
2007-03-28 1:21 ` [RFC 2/3] powerpc: Add arch/powerpc support for the " Mark A. Greer
2007-03-28 1:22 ` [RFC 3/3] powerpc: Add DTS file " Mark A. Greer
2007-03-28 16:43 ` Yoder Stuart-B08248
2007-03-28 18:11 ` Josh Boyer
2007-03-28 19:49 ` [RFC 3/3] powerpc: Add DTS file for the Motorola PrPMC2800platform Yoder Stuart-B08248
2007-03-29 0:35 ` [RFC 3/3] powerpc: Add DTS file for the Motorola PrPMC2800 platform David Gibson
2007-03-29 0:48 ` Segher Boessenkool [this message]
2007-03-29 1:56 ` David Gibson
2007-03-29 22:21 ` Dale Farnsworth
2007-04-02 18:26 ` Mark A. Greer
2007-04-04 11:28 ` Segher Boessenkool
2007-04-04 16:27 ` Mark A. Greer
2007-04-04 17:44 ` Segher Boessenkool
2007-04-02 18:15 ` Mark A. Greer
2007-04-03 0:55 ` David Gibson
2007-04-03 18:50 ` Mark A. Greer
2007-04-04 11:18 ` Segher Boessenkool
2007-04-04 16:29 ` Mark A. Greer
2007-04-04 17:51 ` Yoder Stuart-B08248
2007-04-05 17:48 ` Segher Boessenkool
2007-03-29 22:18 ` Dale Farnsworth
2007-04-02 18:06 ` Mark A. Greer
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