Re: [PATCH] Fix IXP4xx coherent allocations

From: David Miller
Date: Sat Mar 23 2013 - 19:57:47 EST

From: Krzysztof Halasa <khc@xxxxxxxxx>
Date: Sat, 23 Mar 2013 20:35:46 +0100

> ARM core code currently requires coherent DMA mask to be set. Make sure
> we limit PCI devices to 64 MiB while allowing on-chip devices to access
> the whole 4 GiB address space.
> This fixes a v3.7+ regression which broke IXP4xx built-in network devices.
> Signed-off-by: Krzysztof Hałasa <khc@xxxxxxxxx>

This requirement is not reasonable.

The DMA API documentation clearly states what the default must be,
and what drivers are guarenteed will be the default.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at