From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Cc: linuxppc-dev@ozlabs.org, Stefan Roese <sr@denx.de>
Subject: Re: [PATCH] powerpc: Fix problems with 32bit PPC's running with more than 2GB of RAM
Date: Thu, 10 Jul 2008 06:39:39 +1000 [thread overview]
Message-ID: <1215635979.8970.385.camel@pasglop> (raw)
In-Reply-To: <20080709162219.4c07a67e@zod.rchland.ibm.com>
On Wed, 2008-07-09 at 16:22 -0400, Josh Boyer wrote:
> On Thu, 10 Jul 2008 06:02:38 +1000
> Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
>
> > On Wed, 2008-07-09 at 15:44 +0200, Stefan Roese wrote:
> > > This patch enables 32bit PPC's (with 36bit physical address space, e.g.
> > > IBM/AMCC PPC44x) to run with more than 2GB of RAM. Mostly its just
> > > replacing types (unsigned long -> phys_addr_t).
> > >
> > > Tested on an AMCC Katmai with 4GB of DDR2.
> > >
> > > Signed-off-by: Stefan Roese <sr@denx.de>
> >
> > But DMAs will break no ?
>
> How?
Hrm... forget it. It's fine up to 4G of RAM... (ie. as long as DMA is
below 32 bits).
Ben.
next prev parent reply other threads:[~2008-07-09 20:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-09 13:44 [PATCH] powerpc: Fix problems with 32bit PPC's running with more than 2GB of RAM Stefan Roese
2008-07-09 14:20 ` Kumar Gala
2008-07-09 15:05 ` Stefan Roese
2008-07-09 20:02 ` Benjamin Herrenschmidt
2008-07-09 20:22 ` Josh Boyer
2008-07-09 20:39 ` Benjamin Herrenschmidt [this message]
2008-07-10 0:44 ` Josh Boyer
2008-07-10 15:31 ` Becky Bruce
2008-07-12 3:33 ` Benjamin Herrenschmidt
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