sbc8641d: increase monitor size from 256k to 384k

Between v2015.07-rc1 and v2015.07-rc2 this board started
silent boot failure.  A bisect led to commit 6eed3786c6
("net: Move the CMD_NET config to defconfigs").  This commit
looks harmless in itself, but it did implicitly add a feature
to the image which led to this:

 u-boot$git describe 6eed3786c6
 v2015.07-rc1-412-g6eed3786c68c
              ^^^

 u-boot$ls -l ../41*/u-boot.bin
 -rwxrwxr-x 1 paul paul 261476 Oct 16 16:47 ../411/u-boot.bin
 -rwxrwxr-x 1 paul paul 266392 Oct 16 16:43 ../412/u-boot.bin
 u-boot$bc
 bc 1.06.95
 Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
 This is free software with ABSOLUTELY NO WARRANTY.
 For details type `warranty'.
 256*1024
 262144

i.e. we finally broke through the 256k monitor size.  Jump it
up to 384k and fix the hard coded value used in the env offset
at the same time.

We were probably flirting with the 256k size issue without
knowing it when testing on different baselines in earlier
commits, but since this is all board specific, a rebase or
reorder to put this commit 1st is of little value.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

board/sbc8641d/README

@@ -3,7 +3,7 @@ Wind River SBC8641D reference board
 
 Created 06/14/2007 Joe Hamman
 Copyright 2007, Embedded Specialties, Inc.
-Copyright 2007 Wind River Systemes, Inc.
+Copyright 2007 Wind River Systems, Inc.
 -----------------------------
 
 1. Building U-Boot
@@ -43,7 +43,7 @@ c) while on, using static precautions, move JP10 back to the failed image.
 d) use "md fff00000" to confirm you are looking at the failed image
 e) turn off write protect with "prot off all"
 f) get new image, i.e. "tftp 200000 /somepath/u-boot.bin"
-g) erase failed image: "erase FFF00000 FFF3FFFF"
-h) copy in new image: "cp.b 200000 FFF00000 40000"
+g) erase failed image: "erase FFF00000 FFF5FFFF"
+h) copy in new image: "cp.b 200000 FFF00000 60000"
 i) ensure new image is written: "md fff00000"
 k) power cycle the board and confirm new image works.

include/configs/sbc8641d.h

@@ -241,7 +241,7 @@
 #define CONFIG_SYS_GBL_DATA_OFFSET	(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		(256 * 1024)    /* Reserve 256 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN		(384 * 1024)    /* Reserve 384 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN		(1024 * 1024)   /* Reserved for malloc */
 
 /* Serial Port */
@@ -472,7 +472,7 @@
  * Environment
  */
 #define CONFIG_ENV_IS_IN_FLASH	1
-#define CONFIG_ENV_ADDR		(CONFIG_SYS_MONITOR_BASE + 0x40000)
+#define CONFIG_ENV_ADDR		(CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
 #define CONFIG_ENV_SECT_SIZE	0x20000	/* 128k(one sector) for env */
 #define CONFIG_ENV_SIZE		0x2000