U-Boot commands and variables

Common Uboot commands:

1. print (or printenv): prints one or more uboot variables
2. set (or setenv): sets a uboot variable
3. save (or saveenv): saves uboot variables
4. run: evaluate a uboot variable expression
5. ping: if Uboot can access NFS server
6. boot

Common Uboot variables:

1. bootcmd: where linux kernel should boot from
2. bootargs: string passed when booting linux kernel
3. serverip: IP of root file system for NFS boot
4. nfspath: location on serverip for root filsystem

one example:

setenv hostip 1.1.1.0
print bootcmd
setenv bootcmd run nfsboot
setenv rootpath /export/${…}/…
save
boot

another old example:

setenv netmask 255.255.255.0
setenv ipadd 1.1.1.1
setenv serverip 1.1.1.2
setenv gatewayip 1.1.1.3
save
tftp 0 …