Common U-boot Command Detailed (full)

Turn from: http://blog.csdn.net/ghostyu/article/details/6968681

U-boot has developed to the present, his command line mode is very close to the shell under Linux, command line mode mode to support the "tab" key command Completion and command history . And if you type the first few characters of the command and don't repeat the other commands, so you just need to play these characters, like I want to see this u-boot version number, the command is "version", but in all of the commands are not any other command is "V" start, so only need to enter " V "can be.

[u-boot@mini2440]# version U-boot 2009.11 (April 04 2010-12:09:25) [u-boot@mini2440]# V U-boot 2009.11 (April 04 2010-12:09:25) [u-boot@mini2440]# Base Base address:0x00000000 [u-boot@mini2440]# Ba Base address:0x00000000

Since U-boot supports too many commands, it is not realistic and unnecessary to speak a single detail. So below I pick some burn write and guide commonly used commands to introduce, the other orders are extrapolate, or "Help" bar.
(1) Get help
Command: Help or?
Features: View all commands supported in the current U-boot version.

[u-boot@mini2440]# Help ? -alias for ' help ' Askenv-get Environment variables from stdin Base-print or set address offset Bdinfo-print Board Info Structure Bmp-manipulate BMP image data Boot-boot default, i.e., run ' bootcmd ' Bootd-boot default, i.e., run ' bootcmd ' Bootelf-boot from a ELF image in memory Bootm-boot application image from memory Bootp-boot image via network using BOOTP/TFTP protocol Bootvx-boot VxWorks from the ELF image Cmp-memory Compare Coninfo-print Console devices and information Cp-memory Copy Crc32-checksum calculation Date-get/set/reset Date & Time Dcache-enable or disable data cache Dhcp-boot image via network using DHCP/TFTP protocol Echo-echo args to Console Editenv-edit environment variable Eeprom-eeprom sub-system Erase-erase FLASH Memory Exit-exit Script 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 Fsinfo-print Information about filesystems Fsload-load binary file from a filesystem image Go-start application at address ' addr ' Help-print online Help I2C-I2C sub-system Icache-enable or disable instruction cache Iminfo-print header information for application image Imls-list all images found in flash Imxtract-extract a part of a multi-image Itest-return true/false on integer Compare Loadb-load binary file over serial line (Kermit mode) Loads-load S-record file over serial line Loadx-load binary file over serial line (Xmodem mode) Loady-load binary file over serial line (Ymodem mode) Loop-infinite Loop on address range ls-list files in a directory (default/) Md-memory Display Mm-memory Modify (auto-incrementing address) Mmc-mmc sub-system 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 Reginfo-print Register Information Reset-perform RESET of the CPU Run-run commands in a environment variable Saveenv-save environment variables to persistent storage Setenv-set Environment variables Showvar-print Local Hushshell variables Sleep-delay execution for some time Source-run Script from memory Test-minimal Test like/bin/sh Tftpboot-boot image via network using TFTP protocol Unzip-unzip A memory region Usb-usb sub-system Usbboot-boot from USB device Version-print Monitor Version

If you want to get more detailed help for a command, you can use:

Help < The instructions you want to check > Or? < you want to check the instructions >, Even h < you want to look up the instruction abbreviation >.

Take BMP directives for example:

[u-boot@mini2440]# help BMP bmp-manipulate BMP image data Usage: BMP Info <imageAddr>-Display Image info BMP display <imageAddr> [x y]-display image at X,y [u-boot@mini2440]# ? Bmp bmp-manipulate BMP image data Usage: BMP Info <imageAddr>-Display Image info BMP display <imageAddr> [x y]-display image at X,y [u-boot@mini2440]# H BM bmp-manipulate BMP image data Usage: BMP Info <imageAddr>-Display Image info BMP display <imageAddr> [x y]-display image at X,y

(2) environment variables (environment variables, env) and related directives
Like the shell, U-boot also has environment variables. Some u-boot default environment variables are as follows:

Environment variables	Explanatory notes
BootDelay	Wait seconds to perform an automatic start (command in Bootcmd)
BaudRate	Baud rate of Serial control console
Netmask	Network Mask for Ethernet
Ethaddr	MAC Address of Ethernet
Bootfile	The default download file name
Bootargs	Boot parameters passed to the Linux kernel
Bootcmd	Execute command at auto start