setenv bootargs 'root=/dev/sda1 waitforroot=3 rootfs=ext3 console=tty1 console=ttyS0,115200 mem=384M@0M mem=512M@512M nvmem=128M@384M vmalloc=248M video=tegrafb'
usb reset 1
ext2load usb 0:1 0x01100000 /boot/uinitrd-tegra
ext2load usb 0:1 0x00800000 /boot/uImage-tegra
bootm 0x00800000 0x01100000