Fix the exception occuring in RAM table search issue.

The original search_one_table() function code can only processes the search
for the exception occurring in FLASH/ROM, because the exception and fixup
table usually locate in FLASH. If the exception address is also in
FLASH, it will be OK.
If the exception occurs in RAM, after the u-boot relocation, a
relocation offset should be added.

clean up the code in cpu/74xx_7xx/cpu.c

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>

cpu/74xx_7xx/cpu.c

@@ -164,6 +164,10 @@ int checkcpu (void)
 		str = "MPC7410";
 		break;
 
+	case CPU_7447A:
+		str = "MPC7447A";
+		break;
+
 	case CPU_7448:
 		str = "MPC7448";
 		break;
@@ -180,14 +184,6 @@ int checkcpu (void)
 		str = "MPC7457";
 		break;
 
-	case CPU_7447A:
-		str = "MPC7447A";
-		break;
-
-	case CPU_7448:
-		str = "MPC7448";
-		break;
-
 	default:
 		printf("Unknown CPU -- PVR: 0x%08x\n", pvr);
 		return -1;

include/configs/mpc7448hpc2.h

@@ -439,6 +439,5 @@
  */
 #define BOOTFLAG_COLD	0x01	/* Normal Power-On: Boot from FLASH */
 #define BOOTFLAG_WARM	0x02	/* Software reboot */
-#define CFG_EXCEPTION_AFTER_RELOCATE
 #define CFG_SERIAL_HANG_IN_EXCEPTION
 #endif	/* __CONFIG_H */

lib_ppc/extable.c

@@ -57,16 +57,22 @@ search_one_table(const struct exception_table_entry *first,
 		long diff;
 
 		mid = (last - first) / 2 + first;
-#ifdef CFG_EXCEPTION_AFTER_RELOCATE
-		diff = (mid->insn + gd->reloc_off) - value;
-		if (diff == 0)
-			return (mid->fixup + gd->reloc_off);
-#else
+		if (mid > CFG_MONITOR_BASE){ 
+		/* exception occurs in FLASH, before u-boot relocation.
+		 * No relocation offset is needed. 
+		 */
 			diff = mid->insn - value;
 			if (diff == 0)
 				return mid->fixup;
-#endif
-		else if (diff < 0)
+		} else {
+		/* exception occurs in RAM, after u-boot relocation. 
+		 * A relocation offset should be added.
+		 */
+			diff = (mid->insn + gd->reloc_off) - value;
+			if (diff == 0)
+				return (mid->fixup + gd->reloc_off);
+		}
+		if (diff < 0)
 			first = mid+1;
 		else
 			last = mid-1;
@@ -83,6 +89,7 @@ search_exception_table(unsigned long addr)
 
 	/* There is only the kernel to search.  */
 	ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);
+	/* if the serial port does not hang in exception, printf can be used */
 #if !defined(CFG_SERIAL_HANG_IN_EXCEPTION)
 	if (ex_tab_message)
 		printf("Bus Fault @ 0x%08lx, fixup 0x%08lx\n", addr, ret);