Add four main boot methods to developer build

include/configs/chromeos/tegra2/recovery.h

Index: include/configs/chromeos/tegra2/recovery.h
diff --git a/include/configs/chromeos/tegra2/recovery.h b/include/configs/chromeos/tegra2/recovery.h
index 1cb577fa63f3ba9ccdb3770ae0e50f30dec06d9e..13120f2f0fd81fb25d3d62afb4d82246eed5cc2c 100644
--- a/include/configs/chromeos/tegra2/recovery.h
+++ b/include/configs/chromeos/tegra2/recovery.h
@@ -12,4 +12,29 @@
 
 #include <configs/chromeos/tegra2/parts/usb.h>
 
+/*
+ * Recovery mode tries to boot from all the sources in sequence. The boot
+ * source has a U-Boot script in it which contains the appropriate boot
+ * commands.
+ */
+#define CONFIG_EXTRA_ENV_SETTINGS_ARCH \
+	"scriptaddr=0x408000\0" \
+	"script_img=/u-boot/boot.scr.uimg\0" \
+	"mmc0_boot=setenv devnum 0; run mmc_boot;\0" \
+	"mmc1_boot=setenv devnum 1; run mmc_boot;\0" \
+	"usb0_boot=usb start 0; run usb_boot;\0" \
+	"usb1_boot=usb start 1; run usb_boot;\0" \
+	"scr_boot=fatload ${devtype} ${devnum}:c ${scriptaddr} ${script_img};"\
+		"source ${scriptaddr};" \
+		"read ${devtype} ${devnum}:${kernelpart} ${scriptaddr} 0 10;" \
+		"source ${scriptaddr};\0" \
+	"mmc_boot=mmc init ${devnum};" \
+		"setenv devtype mmc;" \
+	        "setenv devname mmcblk${devnum}p;" \
+		"run scr_boot;\0" \
+	"usb_boot=setenv devtype usb;" \
+		"setenv devnum 0;" \
+		"setenv devname sda;" \
+		"run scr_boot;\0"
+
 #endif //__configs_chromeos_tegra2_recovery_h__