BestComm, a DMA engine in MPC52xx SoC, requires snooping when CPU caches are enabled to work properly.
Adding CPU_FTR_NEED_COHERENT fixes NFS problems on MPC52xx machines introduced by 'powerpc/mm: Fix handling of _PAGE_COHERENT in BAT setup code'. Signed-off-by: Piotr Ziecik <ko...@semihalf.com> --- This patch was succesfully tested on our MPC5200-based. Ben, Gerhard could you ack this patch, as it implements your suggestion. arch/powerpc/include/asm/cputable.h | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h index b18358f..22dc2d8 100644 --- a/arch/powerpc/include/asm/cputable.h +++ b/arch/powerpc/include/asm/cputable.h @@ -241,9 +241,11 @@ extern const char *powerpc_base_platform; /* We need to mark all pages as being coherent if we're SMP or we have a * 74[45]x and an MPC107 host bridge. Also 83xx and PowerQUICC II * require it for PCI "streaming/prefetch" to work properly. + * This is also required by 52xx family. */ #if defined(CONFIG_SMP) || defined(CONFIG_MPC10X_BRIDGE) \ - || defined(CONFIG_PPC_83xx) || defined(CONFIG_8260) + || defined(CONFIG_PPC_83xx) || defined(CONFIG_8260) \ + || defined(CONFIG_PPC_MPC52xx) #define CPU_FTR_COMMON CPU_FTR_NEED_COHERENT #else #define CPU_FTR_COMMON 0 -- 1.6.0.6 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
