Blackfin: make default ADI env more flexible

Allow boards to easily override the root= and default bootcmd, allow
people to tweak the file used in default bootcmds at runtime via one env
var, and add a stock nandboot command.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/configs/bfin_adi_common.h

@@ -103,14 +103,19 @@
 #else
 # define CONFIG_BOOTDELAY	5
 #endif
-#define CONFIG_BOOTCOMMAND	"run ramboot"
+#ifndef CONFIG_BOOTCOMMAND
+# define CONFIG_BOOTCOMMAND	"run ramboot"
+#endif
 #ifdef CONFIG_VIDEO
 # define CONFIG_BOOTARGS_VIDEO "console=tty0 "
 #else
 # define CONFIG_BOOTARGS_VIDEO ""
 #endif
+#ifndef CONFIG_BOOTARGS_ROOT
+# define CONFIG_BOOTARGS_ROOT "/dev/mtdblock0 rw"
+#endif
 #define CONFIG_BOOTARGS	\
-	"root=/dev/mtdblock0 rw " \
+	"root=" CONFIG_BOOTARGS_ROOT " " \
 	"clkin_hz=" MK_STR(CONFIG_CLKIN_HZ) " " \
 	"earlyprintk=" \
 		"serial," \
@@ -118,7 +123,17 @@
 		MK_STR(CONFIG_BAUDRATE) " " \
 	CONFIG_BOOTARGS_VIDEO \
 	"console=ttyBF0," MK_STR(CONFIG_BAUDRATE)
-
+#if defined(CONFIG_CMD_NAND)
+# define NAND_ENV_SETTINGS \
+	"nandargs=set bootargs " CONFIG_BOOTARGS "\0" \
+	"nandboot=" \
+		"nand read $(loadaddr) 0x20000 0x100000;" \
+		"run nandargs;" \
+		"bootm" \
+		"\0"
+#else
+# define NAND_ENV_SETTINGS
+#endif
 #if defined(CONFIG_CMD_NET)
 # if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS)
 #  define UBOOT_ENV_FILE "u-boot.bin"
@@ -156,19 +171,23 @@
 		"ip=$(ipaddr):$(serverip):$(gatewayip):$(netmask):" \
 		   "$(hostname):eth0:off" \
 		"\0" \
+	\
+	"ramfile=uImage\0" \
 	"ramargs=set bootargs " CONFIG_BOOTARGS "\0" \
 	"ramboot=" \
-		"tftp $(loadaddr) uImage;" \
+		"tftp $(loadaddr) $(ramfile);" \
 		"run ramargs;" \
 		"run addip;" \
 		"bootm" \
 		"\0" \
+	\
+	"nfsfile=vmImage\0" \
 	"nfsargs=set bootargs " \
 		"root=/dev/nfs rw " \
 		"nfsroot=$(serverip):$(rootpath),tcp,nfsvers=3" \
 		"\0" \
 	"nfsboot=" \
-		"tftp $(loadaddr) vmImage;" \
+		"tftp $(loadaddr) $(nfsfile);" \
 		"run nfsargs;" \
 		"run addip;" \
 		"bootm" \
@@ -177,6 +196,7 @@
 # define NETWORK_ENV_SETTINGS
 #endif
 #define CONFIG_EXTRA_ENV_SETTINGS \
+	NAND_ENV_SETTINGS \
 	NETWORK_ENV_SETTINGS \
 	"flashboot=bootm 0x20100000\0"