[PATCH] m68knommu: dynamic RAM sizing for Motorola 5206e platform

Determine the DRAM size dynamically for the MOTOROLA 5206e platform.
We can just read back the SDRAM register configuration bits to 
determine what the RAM size really is.
Signed-off-by: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/m68knommu/platform/5206e/MOTOROLA/crt0_ram.S

@@ -21,7 +21,6 @@
  */
 
 #define	MEM_BASE	0x00000000	/* Memory base at address 0 */
-#define	MEM_SIZE	0x00400000	/* Memory size 4Mb */
 #define	VBR_BASE	MEM_BASE	/* Vector address */
 
 /*****************************************************************************/
@@ -78,9 +77,36 @@ _start:
 
 
 	/*
-	 *	Set to 4 meg for the Cadre III board (m5206e).
+	 *	SDRAM size for the Cadre III board (m5206e).
 	 */
+#if defined(CONFIG_RAMAUTO)
+	movea.l	#0x00000000,%a0
+	move.l	MCF_MBAR+MCFSIM_DCMR0,%d0
+	and.l	#0x00fe0000, %d0
+	beq	noaddr1
+	add.l	#0x00020000,%d0
+	move.l	%d0,%a0
+noaddr1:
+	move.l	MCF_MBAR+MCFSIM_DCMR1,%d0
+	and.l	#0x00fe0000, %d0
+	beq	noaddr2
+	add.l	#0x00020000,%d0
+	add.l	%d0,%a0
+noaddr2:
+
+#else
+
+#if defined(CONFIG_RAM32MB)
+#define MEM_SIZE	0x02000000	/* Memory size 32Mb */
+#elif defined(CONFIG_RAM16MB)
+#define MEM_SIZE	0x01000000	/* Memory size 16Mb */
+#elif defined(CONFIG_RAM8MB)
+#define MEM_SIZE	0x00800000	/* Memory size 8Mb */
+#else
+#define MEM_SIZE	0x00400000	/* Memory size 4Mb */
+#endif
 	move.l	#MEM_SIZE, %a0
+#endif
 
 	move.l	%a0, %d0			/* Mem end addr is in a0 */
 	move.l	%d0, %sp			/* Set up initial stack ptr */