[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/mpc5xx.h b/include/mpc5xx.h
index 7508f6d..e9b08a0 100644
--- a/include/mpc5xx.h
+++ b/include/mpc5xx.h
@@ -36,6 +36,7 @@
* Exception offsets (PowerPC standard)
*/
#define EXC_OFF_SYS_RESET 0x0100 /* System reset */
+#define _START_OFFSET EXC_OFF_SYS_RESET
/*-----------------------------------------------------------------------
* ISB bit in IMMR to set internal memory map
