1 altbootcmd=run ${subbootcmds}
2 bootcmd=run ${subbootcmds}
3 configure=km_setboardid && saveenv && reset
4 subbootcmds=tftpfdt tftpkernel nfsargs add_default boot
5 nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:/opt/eldk/${arch}
6 tftpkernel=tftpboot ${load_addr_r} ${hostname}/uImage