[PATCH 2/2] ARM: Do not ARM_DMA_MEM_BUFFERABLE on RealView boards with L210/L220

Catalin Marinas catalin.marinas at arm.com
Wed Jun 30 06:45:35 EDT 2010

RealView boards with certain revisions of the L210/L220 cache controller
may have issues (hardware deadlock) with the mandatory barriers (DSB
followed by an L2 cache sync) when ARM_DMA_MEM_BUFFERABLE is enabled.
The patch disables ARM_DMA_MEM_BUFFERABLE for these boards.

Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Cc: Russell King <rmk at arm.linux.org.uk>
Cc: Linus Walleij <linus.walleij at stericsson.com>
 arch/arm/mm/Kconfig |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 3053731..9f10a9b 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -828,6 +828,8 @@ config ARM_L1_CACHE_SHIFT
 	bool "Use non-cacheable memory for DMA" if CPU_V6 && !CPU_V7
+	depends on !(MACH_REALVIEW_PB1176 || REALVIEW_EB_ARM11MP || \
 	default y if CPU_V6 || CPU_V7
 	  Historically, the kernel has used strongly ordered mappings to

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