[ARM] nommu: fixups for the exception vectors

The high page vector (0xFFFF0000) does not supported in nommu mode.
This patch allows the vectors to be 0x00000000 or the begining of DRAM
in nommu mode.

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm/Kconfig-nommu b/arch/arm/Kconfig-nommu
index 8ce56e5bd78f..e1574be2ded6 100644
--- a/arch/arm/Kconfig-nommu
+++ b/arch/arm/Kconfig-nommu
@@ -25,3 +25,20 @@ config FLASH_SIZE
         hex 'FLASH Size' if SET_MEM_PARAM
         default 0x00400000
 
+config REMAP_VECTORS_TO_RAM
+        bool 'Install vectors to the begining of RAM' if DRAM_BASE
+        depends on DRAM_BASE
+        help
+          The kernel needs to change the hardware exception vectors.
+          In nommu mode, the hardware exception vectors are normally
+          placed at address 0x00000000. However, this region may be
+          occupied by read-only memory depending on H/W design.
+
+          If the region contains read-write memory, say 'n' here.
+
+          If your CPU provides a remap facility which allows the exception
+          vectors to be mapped to writable memory, say 'n' here.
+
+          Otherwise, say 'y' here.  In this case, the kernel will require
+          external support to redirect the hardware exception vectors to
+          the writable versions located at DRAM_BASE.