Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH 7/9] ARM: DMA: steal memory for DMA coherent mappings | Date | Fri, 12 Aug 2011 14:53:05 +0200 |
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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
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