From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mitch Bradley <wmb@firmworks.com>
Cc: microblaze-uclinux@itee.uq.edu.au,
devicetree-discuss <devicetree-discuss@lists.ozlabs.org>,
linuxppc-dev <linuxppc-dev@ozlabs.org>,
Olof Johansson <olof@lixom.net>,
Dan Malek <ppc6dev@digitaldans.com>,
Jeremy Kerr <jeremy.kerr@canonical.com>
Subject: Re: Request review of device tree documentation
Date: Sat, 12 Jun 2010 20:48:04 +1000 [thread overview]
Message-ID: <1276339684.1962.186.camel@pasglop> (raw)
In-Reply-To: <1276339529.1962.184.camel@pasglop>
On Sat, 2010-06-12 at 20:45 +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2010-06-11 at 22:19 -1000, Mitch Bradley wrote:
> > It seems that many of the differences at the CPU level can be determined
> > by looking at "coprocessor" registers. For what purpose(s) do we need
> > to identify the core? That will inform our choice of a core ID schema.
>
> The primary thing I see would be architecture version compliance,
> though this is better carried additionally via a binary field in
> the header or a GPR at the entry point, to help the initial asm
> code to setup the MMU etc... before getting into C code.
Also, if you're going to revive a "real" OF port to ARM (with client
interface etc...), should we start considering moving some of powerpc's
prom_init.c to a generic place ?
IE. prom_init is a trampoline that uses the client interface to
essentially create a flatten device-tree and enter the kernel via the
common "epapr" style entry point.
The main drawback is that it doesn't allow to keep OF alive along with
the OS, but then, only sparc does that successfully and I'm not sure
it's something that would be practical to do on ARM either.
Cheers,
Ben.
next prev parent reply other threads:[~2010-06-12 10:48 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-11 22:59 Request review of device tree documentation Grant Likely
2010-06-11 23:47 ` Dan Malek
2010-06-12 2:58 ` Benjamin Herrenschmidt
2010-06-12 4:48 ` Mitch Bradley
2010-06-12 6:53 ` Grant Likely
2010-06-12 8:19 ` Mitch Bradley
2010-06-12 10:45 ` Benjamin Herrenschmidt
2010-06-12 10:48 ` Benjamin Herrenschmidt [this message]
2010-06-12 16:30 ` Mitch Bradley
2010-06-12 22:52 ` Benjamin Herrenschmidt
2010-06-13 5:07 ` Grant Likely
2010-06-13 5:39 ` Mitch Bradley
2010-06-13 5:59 ` Benjamin Herrenschmidt
2010-06-13 6:45 ` Mitch Bradley
2010-06-13 8:29 ` Benjamin Herrenschmidt
2010-06-14 5:36 ` Grant Likely
2010-06-14 20:00 ` Ben Dooks
2010-06-13 8:57 ` Benjamin Herrenschmidt
2010-06-14 5:23 ` Grant Likely
2010-06-14 7:38 ` Russell King - ARM Linux
2010-06-14 7:45 ` Mitch Bradley
2010-06-14 9:25 ` Russell King - ARM Linux
2010-06-14 9:36 ` Benjamin Herrenschmidt
2010-06-14 9:47 ` Russell King - ARM Linux
2010-06-14 14:29 ` Jamie Lokier
2010-06-14 13:51 ` Nicolas Pitre
2010-06-14 15:35 ` Grant Likely
2010-06-14 15:58 ` Nicolas Pitre
2010-06-14 16:16 ` Grant Likely
2010-06-14 5:02 ` Grant Likely
2010-06-14 12:44 ` David Gibson
2010-06-14 14:59 ` Nicolas Pitre
2010-06-14 15:08 ` Grant Likely
2010-06-14 16:02 ` Jamie Lokier
2010-06-14 16:23 ` Nicolas Pitre
2010-06-14 16:29 ` Grant Likely
2010-06-14 16:28 ` Grant Likely
2010-06-14 16:33 ` Jamie Lokier
2010-06-14 16:58 ` Mitch Bradley
2010-06-14 17:26 ` Nicolas Pitre
2010-06-14 18:20 ` Mitch Bradley
2010-06-14 19:40 ` Nicolas Pitre
2010-06-14 20:08 ` Mark Brown
2010-06-16 6:09 ` Mike Rapoport
2010-06-16 6:13 ` Mitch Bradley
2010-06-16 6:17 ` Mike Rapoport
2010-06-16 6:32 ` Mitch Bradley
2010-06-16 6:47 ` Mike Rapoport
2010-06-16 7:40 ` Mitch Bradley
2010-06-16 9:45 ` Vladimir Pantelic
2010-06-16 10:39 ` Mike Rapoport
2010-06-16 11:41 ` Jamie Lokier
2010-06-16 13:48 ` Jamie Bennett
2010-06-16 14:39 ` Nicolas Pitre
2010-06-16 17:43 ` Tim Bird
2010-06-16 6:52 ` M. Warner Losh
2010-06-18 22:12 ` Frank Rowand
2010-06-15 2:02 ` David Gibson
2010-06-14 15:51 ` M. Warner Losh
2010-06-13 5:48 ` Benjamin Herrenschmidt
2010-06-14 5:13 ` Grant Likely
2010-06-14 6:09 ` Benjamin Herrenschmidt
2010-06-14 6:17 ` Mitch Bradley
2010-06-12 22:15 ` Olof Johansson
2010-06-12 23:09 ` Grant Likely
2010-06-13 6:47 ` [microblaze-uclinux] " Edgar E. Iglesias
2010-06-12 3:00 ` Benjamin Herrenschmidt
2010-06-12 3:07 ` Benjamin Herrenschmidt
2010-06-13 13:12 ` Jeremy Kerr
2010-06-14 5:40 ` Grant Likely
2010-06-12 17:33 ` Stephan Gatzka
2010-06-12 18:19 ` Grant Likely
2010-06-14 5:54 ` Grant Likely
2010-08-05 4:43 ` David Gibson
2010-09-01 16:19 ` Grant Likely
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