[ppc] Fix build breakage for all non-4xx PowerPC variants.
- adapt to the more generic EXCEPTION_PROLOG and CRIT_EXCEPTION macros
- minor 4xx cleanup
diff --git a/include/ppc4xx.h b/include/ppc4xx.h
index 8cead66..ca241d2 100644
--- a/include/ppc4xx.h
+++ b/include/ppc4xx.h
@@ -22,7 +22,8 @@
#ifndef __PPC4XX_H__
#define __PPC4XX_H__
-#define _START_OFFSET 0x2100
+#define EXC_OFF_SYS_RESET 0x0100 /* System reset */
+#define _START_OFFSET (EXC_OFF_SYS_RESET + 0x2000)
#if defined(CONFIG_440)
#include <ppc440.h>