User Guide

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Each of these commands has additional help available, which can be viewed by entering
help <command>.
The following table explains some of the more often used commands:
All numeric values, which are needed for different commands, are interpreted as
HEX values. Entering 30100000 means 0x30100000.To speed up programming,
the real size of the image files can be used. In the commands above we have
used the maximum size of the partition instead of the actual size of the image
files (0x180000 words = 3 Mb)
bootm ADDR ARG
boots image from ADDR passing arguments ARG. ARG is the
address of the initrd image
boot, bootd boots image via running default bootcmd
nand bad prints a list of bad blocks on the current device
nand erase OFF SIZE erase SIZE bytes from OFF
nand erase clean
erase entire NAND Flash
WARNING: after this command, U-Boot has to be reprogrammed
nand read ADDR OFF SIZE
read SIZE bytes from OFF in NAND flash to ADDR. If there are
bad blocks the command stops with an error.
nand read.jffs2s ADDR OFF SIZE
read SIZE bytes from OFF in NAND flash to ADDR. Bad blocks are
skipped.
nand write ADDR OFF SIZE
write SIZE bytes from ADDR to OFF in NAND flash. If there are
bad blocks or writing fails the command stops with an error.
nand write.jffs2 ADDR OFF SIZE
write SIZE bytes from ADDR to OFF in NAND flash. Bad blocks
are skipped.
printenv prints the environment variables
saveenv stores the changed environment variables persistently
setenv VARIABLE VALUE
sets the environment variable VARIABLE to the given value
VALUE. If a semicolon is used, to set different variables, it has to
be masked with “\”
run VARIABLE executes the commands of VARIABLE like a script
tftp ADDR image
loads image to ADDR via network using TFTP and the environment
variables “ipaddr” and “serverip”
usb reset enables and resets the USB interface
usb scan scans the bus for attached USB storage devices
usb tree shows the connected devices