sh: Fix the offset from P1SEG/P2SEG where we map RAM

We need to map the gap between 0x00000000 and __MEMORY_START in the PMB,
as well as RAM.

With this change my 7785LCR board can switch to 32bit MMU mode at
runtime.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 7 insertions, 6 deletions

diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index 2d009bdcf901..7e64f6d960c5 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -275,7 +275,7 @@ static void __pmb_unmap(struct pmb_entry *pmbe)
 int __uses_jump_to_uncached pmb_init(void)
 {
         unsigned int i;
-        long size;
+        long size, ret;
 
         jump_to_uncached();
 
@@ -287,12 +287,13 @@ int __uses_jump_to_uncached pmb_init(void)
          *      P1 - provides a cached window onto physical memory
          *      P2 - provides an uncached window onto physical memory
          */
-        size = pmb_remap(P2SEG, __MEMORY_START, __MEMORY_SIZE,
-                         PMB_WT | PMB_UB);
-        BUG_ON(size != __MEMORY_SIZE);
+        size = __MEMORY_START + __MEMORY_SIZE;
 
-        size = pmb_remap(P1SEG, __MEMORY_START, __MEMORY_SIZE, PMB_C);
-        BUG_ON(size != __MEMORY_SIZE);
+        ret = pmb_remap(P1SEG, 0x00000000, size, PMB_C);
+        BUG_ON(ret != size);
+
+        ret = pmb_remap(P2SEG, 0x00000000, size, PMB_WT | PMB_UB);
+        BUG_ON(ret != size);
 
         ctrl_outl(0, PMB_IRMCR);