Specifications

5.9.10.5. version - print monitor version
=> help version
version - print monitor, compiler and linker version
Usage:
version
=>
You can print the version and build date of the U-Boot image running on your system using the version
command (short: vers):
=> version
U-Boot 2012.07-00471-ge8925d7-dirty (Oct 01 2012 - 18:20:02)
arm-linux-gnueabi-gcc (Debian 4.7.2-2) 4.7.2
GNU ld (GNU Binutils for Debian) 2.22
=>
5.9.10.6. ? - alias for 'help'
You can use ? as a short form for the help command (see description above).
5.10. U-Boot Environment Variables
The U-Boot environment is a block of memory that is kept on persistent storage and copied to RAM when
U-Boot starts. It is used to store environment variables which can be used to configure the system. The
environment is protected by a CRC32 checksum.
This section lists the most important environment variables, some of which have a special meaning to U-Boot.
You can use these variables to configure the behaviour of U-Boot to your liking.
autoload: if set to "no" (or any string beginning with 'n'), the rarpb, bootp or dhcp commands
will perform only a configuration lookup from the BOOTP / DHCP server, but not try to load any
image using TFTP.
•
autostart: if set to "yes", an image loaded using the rarpb, bootp, dhcp, tftp, disk, or
docb commands will be automatically started (by internally calling the bootm command).
•
baudrate: a decimal number that selects the console baudrate (in bps). Only a predefined list of
baudrate settings is available.
When you change the baudrate (using the "setenv baudrate ..." command), U-Boot will switch the
baudrate of the console terminal and wait for a newline which must be entered with the new speed
setting. This is to make sure you can actually type at the new speed. If this fails, you have to reset the
board (which will operate at the old speed since you were not able to saveenv the new settings.)
If no "baudrate" variable is defined, the default baudrate of 115200 is used.
•
bootargs: The contents of this variable are passed to the Linux kernel as boot arguments (aka
"command line").
•
bootcmd: This variable defines a command string that is automatically executed when the initial
countdown is not interrupted.
This command is only executed when the variable bootdelay is also defined!
•
5.10. U-Boot Environment Variables 79