From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Dave Airlie <airlied@gmail.com>, Martyn Welch <martyn.welch@ge.com>
Cc: "Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: Radeon drivers on PowerPC (e500)
Date: Wed, 18 Jun 2014 11:48:36 +1000 [thread overview]
Message-ID: <1403056116.7661.187.camel@pasglop> (raw)
In-Reply-To: <CAPM=9ty721aVY51BBwF7niPLQXKDdMPEGNPQcYJ9jK54S6B0ew@mail.gmail.com>
On Wed, 2014-06-18 at 11:05 +1000, Dave Airlie wrote:
>
> I don't think we ever ioremap GART, it should kmap GART pages, ioremap
> should only happen for VRAM areas AFAIK,
>
> This isn't some 32-bit vs 36-bit BAR or something, I seem to remember BenH
> mentioning something like that before.
Yes, it's a recurring problem in the DRM with physical addresses that are
bigger than 32-bit on 32-bit systems. There have been patches done to
fix that but afaik never quite "completed". I can dig internally if
I can put my hand onto something.
If possible at all, can you try to configure your SoC to bring the MMIO
space of the PCIe within the bottom 32-bit of the chip address space ?
(Or use a 64-bit e5500 based chip ? :-)
Cheers,
Ben.
next prev parent reply other threads:[~2014-06-18 1:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-17 19:14 Radeon drivers on PowerPC (e500) Martyn Welch
2014-06-18 1:05 ` Dave Airlie
2014-06-18 1:48 ` Benjamin Herrenschmidt [this message]
2014-06-18 8:39 ` Martyn Welch
2014-06-26 8:28 ` Martyn Welch
2014-06-18 8:09 ` Martyn Welch
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