On 18/06/14 02:48, Benjamin Herrenschmidt wrote:
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 ?
I've go a hold of a U-Boot build that brings the chip up in 32-bit mode
and modified the DTS to suit. Seemed like the easiest way to see whether
it would work. It does. I have a Radeon E6460 showing an X display, at
the moment using the fbdev driver. Baby steps...
(Or use a 64-bit e5500 based chip ? :-)
Yeah, haven't got any of those lying around ;-)
Thanks guys,
Martyn
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