sh: Make PAGE_OFFSET configurable.

nommu needs to be able to shift PAGE_OFFSET, so we switch it to a
non-user-visible CONFIG_PAGE_OFFSET and use that in the few places
where it matters.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 9064dfc91e6d..f25903aa607b 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -161,6 +161,37 @@ config MMU
           turning this off will boot the kernel on these machines with the
           MMU implicitly switched off.
 
+config PAGE_OFFSET
+        hex
+        default "0x80000000" if MMU
+        default "0x00000000"
+
+config MEMORY_START
+        hex "Physical memory start address"
+        default "0x08000000"
+        ---help---
+          Computers built with Hitachi SuperH processors always
+          map the ROM starting at address zero.  But the processor
+          does not specify the range that RAM takes.
+
+          The physical memory (RAM) start address will be automatically
+          set to 08000000. Other platforms, such as the Solution Engine
+          boards typically map RAM at 0C000000.
+
+          Tweak this only when porting to a new machine which does not
+          already have a defconfig. Changing it from the known correct
+          value on any of the known systems will only lead to disaster.
+
+config MEMORY_SIZE
+        hex "Physical memory size"
+        default "0x00400000"
+        help
+          This sets the default memory size assumed by your SH kernel. It can
+          be overridden as normal by the 'mem=' argument on the kernel command
+          line. If unsure, consult your board specifications or just leave it
+          as 0x00400000 which was the default value before this became
+          configurable.
+
 config 32BIT
         bool "Support 32-bit physical addressing through PMB"
         depends on CPU_SH4A