On Wednesday 14 March 2012 15:12:10 Eric Nelson wrote:
On 03/13/2012 10:41 PM, Mike Frysinger wrote:
On Wednesday 14 March 2012 01:12:38 Eric Nelson wrote:
Most of the PPC devices seem to have values of 16 or 32 for ARCH_DMA_MINALIGN, but PPC64BRIDGE and E500MC would have a problem if their drivers don't implement a bounce buffer because PKTALIGN< ARCH_DMA_MINALIGN.
(see arch/powerpc/include/asm/cache.h)
This condition is properly tested for in fec_mxc.c.
so fix this in common code instead of hacking around it in individual drivers. seems to me that PKTALIGN should be defined to ARCH_DMA_MINALIGN and ultimately removed.
I'm not in a position to test against MAKEALL, but it appears that all architectures have cache.h and define ARCH_DMA_MINALIGN
ARCH_DMA_MINALIGN is required. if an arch/board omits it, they are broken and you need not worry about it. we already have common code requiring int.
--- a/include/net.h +++ b/include/net.h
-#define PKTALIGN 32 +#define PKTALIGN ARCH_DMA_MINALIGN
looks fine to me -mike