U-Boot> help
? - alias for 'help'
base - print or set address offset
boot - boot default, i.e., run 'bootcmd'
bootd - boot default, i.e., run 'bootcmd'
bootm - boot application image from memory
bootp - boot image via network using BOOTP/TFTP protocol
cmp - memory compare
coninfo - print console devices and information
cp - memory copy
crc32 - checksum calculation
dhcp - boot image via network using DHCP/TFTP protocol
echo - echo args to console
erase - erase FLASH memory
fatinfo - print information about filesystem
fatload - load binary file from a dos filesystem
fatls - list files in a directory (default /)
flinfo - print FLASH memory information
go - start application at address 'addr'
help - print online help
imxtract- extract a part of a multi-image
itest - return true/false on integer compare
loadb - load binary file over serial line (kermit mode)
loady - load binary file over serial line (ymodem mode)
loop - infinite loop on address range
md - memory display
mm - memory modify (auto-incrementing address)
mtest - simple RAM read/write test
mw - memory write (fill)
nand - NAND sub-system
nboot - boot from NAND device
nfs - boot image via network using NFS protocol
nm - memory modify (constant address)
ping - send ICMP ECHO_REQUEST to network host
printenv- print environment variables
protect - enable or disable FLASH write protection
rarpboot- boot image via network using RARP/TFTP protocol
reset - Perform RESET of the CPU
run - run commands in an environment variable
saveenv - save environment variables to persistent storage
setenv - set environment variables
sleep - delay execution for some time
tftpboot- boot image via network using TFTP protocol
usb - USB sub-system
usbboot - boot from USB device
version - print monitor version
U-Boot> printenv
bootargs=mem=32M console=ttyS0,115200 initrd=0x21900000,5242880 root=/dev/ram0 rw
bootcmd=nand read 0x21000000 0x100000 0x200000; nand read 0x21900000 0x400000 0x200000; bootm 0x21000000
bootdelay=1
baudrate=115200
ethaddr=22:33:11:44:55
ipaddr=192.168.1.140
serverip=192.168.1.100
netmask=255.255.255.0
stdin=serial
stdout=serial
stderr=serial
ethact=macb0
Environment size: 360/131067 bytes