uBoot Environment variables

arcNumber=4931
baudrate=115200
bootcmd=run bootcmd_uenv; run set_bootargs_usb; run usb_init; run usb_boot
bootcmd_uenv=run uenv_load; if test $uenv_loaded -eq 1; then run uenv_import; fi
bootdelay=2
console=ttyS0,115200
device=0:1
ethact=egiga0
ethaddr=5c:f4:ab:df:07:2b
led_error=orange blinking
led_exit=green off
led_init=green blinking
load_dtb=ext2load usb 0:1 0x1c00000 /boot/dts/kirkwood-nsa310s.dtb
load_initrd=ext2load usb 0:1 0x1100000 /boot/uInitrd
load_uimage=ext2load usb 0:1 0x800000 /boot/uImage
mainlineLinux=yes
mtdids=nand0=orion_nand
mtdparts=mtdparts=orion_nand:0x80000@0x0(uboot),0x20000@0xc0000(uboot_env)
partition=nand0,2
rootdelay=4
rootfstype=ext4
serverip=192.168.1.100
set_bootargs_usb=setenv bootargs console=ttyS0,115200 root=LABEL=rootfs rootfstype=ext4
stderr=serial
stdin=serial
stdout=serial
uenv_import=echo importing envs ...; env import -t 0x810000
uenv_load=usb start; setenv uenv_loaded 0; for devtype in usb; do for disknum in 0; do run uenv_read_disk; done; done
uenv_loaded=0
uenv_read=echo loading envs from $devtype $disknum ...; if load $devtype $disknum:1 0x810000 /boot/uEnv.txt; then setenv uenv_loaded 1; fi
uenv_read_disk=if $devtype part $disknum; then run uenv_read; fi
usb_boot=run load_dtb; run load_uimage; if run load_initrd; then bootm 0x800000 0x1100000 0x1c00000; else bootm 0x800000 - 0x1c00000; fi
usb_init=usb start
usb_root=LABEL=rootfs