From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Becky Bruce <becky.bruce@freescale.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: Sat, 12 Jul 2008 13:33:54 +1000 [thread overview]
Message-ID: <1215833634.7549.143.camel@pasglop> (raw)
In-Reply-To: <E87ABEE7-3CD0-45E5-9806-BE3BAAFCFE1C@freescale.com>
> Are you *sure* you can see all 4GB? I thought we lost some of the 32-
> bit PCI address space for PCI IO...... Disclaimer: I'm no expert on
> PCI :)
You are right. I didn't think that through when I replied. We do lose
some of it for MMIO (not IO). So we cannot really go all the way to 4G
because we can't DMA to all of it, right.
> FYI, I'm *very* close to having swiotlb fully functional on powerpc to
> support larger RAM - I am able to boot with 6GB on 8641 right now.
> There are some bugs that I'm still shaking out - I hope to push this
> out in the next couple of weeks.
That won't make .27 then ?
Cheers,
Ben.
prev parent reply other threads:[~2008-07-12 3:34 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
2008-07-10 0:44 ` Josh Boyer
2008-07-10 15:31 ` Becky Bruce
2008-07-12 3:33 ` Benjamin Herrenschmidt [this message]
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