On Tuesday 25 March 2014 16:56:41 Phil Edworthy wrote:
> + /* Map all possible DDR as inbound ranges */
> + dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0 0x80000000
> + 0x43000000 1 0x80000000 1 0x80000000 0 0x80000000>;
Typo: 0x43000000 should be 0x42000000 I guess.
Since you control the mapping, I wonder if you could also do this as
dma-ranges = <0x42000000 0 0x00000000 0 0x40000000 0 0x80000000
0x43000000 0 0x80000000 1 0x80000000 0 0x80000000>;
i.e. map all the RAM into PCI bus addresses below the 32-bit boundary.
This would be really nice from the perspective that now all PCI
devices could access all of RAM without using an IOMMU or the
relying on 64-bit master capability.
The downside of this is that you'd probably need a custom dma_map_ops
wrapper.
Arnd
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