ppc4xx: Fix problem with init-ram bigger than 4k on 440 platforms

Signed-off-by: Stefan Roese <sr@denx.de>

cpu/ppc4xx/start.S

@@ -110,6 +110,10 @@
 # endif
 #endif /* CFG_INIT_DCACHE_CS */
 
+#if (defined(CFG_INIT_RAM_DCACHE) && (CFG_INIT_RAM_END > (4 << 10)))
+#error Only 4k of init-ram is supported - please adjust CFG_INIT_RAM_END!
+#endif
+
 #define function_prolog(func_name)	.text; \
 					.align 2; \
 					.globl func_name; \

include/configs/pcs440ep.h

@@ -66,7 +66,7 @@
  *----------------------------------------------------------------------*/
 #define CFG_INIT_RAM_DCACHE	1		/* d-cache as init ram	*/
 #define CFG_INIT_RAM_ADDR	0x70000000		/* DCache       */
-#define CFG_INIT_RAM_END	(8 << 10)
+#define CFG_INIT_RAM_END	(4 << 10)
 #define CFG_GBL_DATA_SIZE	256			/* num bytes initial data*/
 #define CFG_GBL_DATA_OFFSET	(CFG_INIT_RAM_END - CFG_GBL_DATA_SIZE)
 #define CFG_INIT_SP_OFFSET	CFG_GBL_DATA_OFFSET

include/configs/yosemite.h

@@ -75,7 +75,7 @@
  *----------------------------------------------------------------------*/
 #define CFG_INIT_RAM_DCACHE	1		/* d-cache as init ram	*/
 #define CFG_INIT_RAM_ADDR	0x70000000		/* DCache       */
-#define CFG_INIT_RAM_END	(8 << 10)
+#define CFG_INIT_RAM_END	(4 << 10)
 #define CFG_GBL_DATA_SIZE	256			/* num bytes initial data*/
 #define CFG_GBL_DATA_OFFSET	(CFG_INIT_RAM_END - CFG_GBL_DATA_SIZE)
 #define CFG_INIT_SP_OFFSET	CFG_GBL_DATA_OFFSET