mpc83xx: fix the corruption of u-boot when saveenv

Robert P. J. Day has pointed that the value of SYS_MONITOR_LEN in
MPC8315ERDB.h is smaller than the u-boot.bin. This will cause the
overlap between the code of u-boot and the environment variable.
So when executing saveenv, it will corrupt the code of u-boot and
causes the board not boot. Fix this for all the mpc83xx boards by
reserving a 512K area.

Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Reviewed-by: York Sun <york.sun@nxp.com>

include/configs/MPC8308RDB.h

@@ -203,7 +203,7 @@
  */
 #define CONFIG_SYS_MONITOR_BASE	CONFIG_SYS_TEXT_BASE /* start of monitor */
 
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024) /* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024) /* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(512 * 1024) /* Reserved for malloc */
 
 /*

include/configs/MPC8313ERDB.h

@@ -241,7 +241,7 @@
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
 /* CONFIG_SYS_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024)	/* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024)	/* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(512 * 1024)	/* Reserved for malloc */
 
 /*

include/configs/MPC8315ERDB.h

@@ -169,7 +169,7 @@
 /*
  * The reserved memory
  */
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024) /* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024) /* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(512 * 1024) /* Reserved for malloc */
 
 /*

include/configs/MPC8323ERDB.h

@@ -156,7 +156,7 @@
 #endif
 
 /* CONFIG_SYS_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024)	/* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024)	/* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(256 * 1024)	/* Reserved for malloc */
 
 /*

include/configs/MPC832XEMDS.h

@@ -168,7 +168,7 @@
 #endif
 
 /* CONFIG_SYS_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024)	/* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024)	/* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(256 * 1024)	/* Reserved for malloc */
 
 /*

include/configs/MPC8349EMDS.h

@@ -225,7 +225,7 @@
 			(CONFIG_SYS_INIT_RAM_SIZE - GENERATED_GBL_DATA_SIZE)
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024)	/* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024)	/* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(256 * 1024)	/* Reserved for malloc */
 
 /*

include/configs/MPC8349ITX.h

@@ -330,7 +330,7 @@ boards, we say we have two, but don't display a message if we find only one. */
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
 /* CONFIG_SYS_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024) /* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024) /* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(256 * 1024) /* Reserved for malloc */
 
 /*

include/configs/MPC837XEMDS.h

@@ -200,7 +200,7 @@
 #endif
 
 /* CONFIG_SYS_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024) /* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024) /* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(512 * 1024) /* Reserved for malloc */
 
 /*

include/configs/MPC837XERDB.h

@@ -225,7 +225,7 @@
 #undef	CONFIG_SYS_RAMBOOT
 #endif
 
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024) /* Reserve 384 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024) /* Reserve 512 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN	(512 * 1024) /* Reserved for malloc */
 
 /*