On Friday 12 August 2011, Marek Szyprowski wrote:
From: Russell King rmk+kernel@arm.linux.org.uk
Steal memory from the kernel to provide coherent DMA memory to drivers. This avoids the problem with multiple mappings with differing attributes on later CPUs.
Signed-off-by: Russell King rmk+kernel@arm.linux.org.uk [m.szyprowski: rebased onto 3.1-rc1] Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
Hi Marek,
Is this the same patch that Russell had to revert because it didn't work on some of the older machines, in particular those using dmabounce?
I thought that our discussion ended with the plan to use this only for ARMv6+ (which has a problem with double mapping) but not on ARMv5 and below (which don't have this problem but might need dmabounce).
Arnd