loadpreenv=load mmc ${mmcdev}:${mmcpart} 0x12000000 preenv.txt; env import -t 0x12000000 ${filesize}
loadkernel=load mmc ${mmcdev}:${mmcpart} 0x12000000 uImage
loadinitrd=load mmc ${mmcdev}:${mmcpart} 0x12A00000 uInitrd

bootcmd=run loadpreenv; run loadkernel; run loadinitrd; bootm 0x12000000 0x12A00000
uenvcmd=boot