Add four main boot methods to developer build

include/configs/chromeos/tegra2/common.h

 /*
  *  (C) Copyright 2010
  *  NVIDIA Corporation <www.nvidia.com>
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
@@ skipping 49 matching lines @@
 #ifdef CONFIG_TEGRA2_LP0
 #define TEGRA_LP0_DEFAULT_ADDR          0x1C406000
 #define TEGRA_LP0_SIZE                  0x2000
 
 #define CONFIG_PLATFORM_EXTRAS_ARCH \
         "lp0_vec=" QUOTE(TEGRA_LP0_SIZE) "@" QUOTE(TEGRA_LP0_DEFAULT_ADDR)
 #endif
 
 #define CONFIG_LOADADDR                 0x40C000
 #define CONFIG_BOOTDELAY                2       /* 2s to break to prompt */
-#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"
 
 #define CONFIG_SYS_LOAD_ADDR            0xA00800
 
 #define CONFIG_SYS_HZ                   1000
 
 /*-----------------------------------------------------------------------
  * Stack sizes
  *
  * The stack sizes are set up in start.S using the settings below
  */
@@ skipping 15 matching lines @@
 #include <configs/chromeos/tegra2/parts/gpio.h>
 #include <configs/chromeos/tegra2/parts/i2c.h>
 #include <configs/chromeos/tegra2/parts/lcd.h>
 #include <configs/chromeos/tegra2/parts/mmc.h>
 #include <configs/chromeos/tegra2/parts/nand.h>
 #include <configs/chromeos/tegra2/parts/uart.h>
 
 #define CONFIG_DISPLAY_BOARDINFO        1
 
 #endif /*__configs_chromeos_tegra2_common_h__*/