[PATCH] m68knommu: auto detect memory size on M5208EVB board

Here is a small patch to automatically detect the DRAM size on m520x.
It was generated against 2.6.17-uc0, and tested on an Intec 5208 dev board.

Signed-off-by: Michael Broughton <mbobowik@telusplanet.net>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/m68knommu/platform/5307/head.S b/arch/m68knommu/platform/5307/head.S
index f2edb6498cd9..b9aa0ca29bfb 100644
--- a/arch/m68knommu/platform/5307/head.S
+++ b/arch/m68knommu/platform/5307/head.S
@@ -64,6 +64,26 @@
         negl    %d0                     /* negate bits */
 .endm
 
+#elif defined(CONFIG_M520x)
+.macro GET_MEM_SIZE
+        clrl    %d0
+        movel   MCF_MBAR+MCFSIM_SDCS0, %d2 /* Get SDRAM chip select 0 config */
+        andl    #0x1f, %d2              /* Get only the chip select size */
+        beq     3f                      /* Check if it is enabled */
+        addql   #1, %d2                 /* Form exponent */
+        moveql  #1, %d0
+        lsll    %d2, %d0                /* 2 ^ exponent */
+3:
+        movel   MCF_MBAR+MCFSIM_SDCS1, %d2 /* Get SDRAM chip select 1 config */
+        andl    #0x1f, %d2              /* Get only the chip select size */
+        beq     4f                      /* Check if it is enabled */
+        addql   #1, %d2                 /* Form exponent */
+        moveql  #1, %d1
+        lsll    %d2, %d1                /* 2 ^ exponent */
+        addl    %d1, %d0                /* Total size of SDRAM in d0 */
+4:
+.endm
+
 #else
 #error "ERROR: I don't know how to probe your boards memory size?"
 #endif