U-Boot: Quick reference

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This page provides quick U-Boot command reference. Please refer to the U-Boot project documentation for detailed descriptions of the features listed below. To get more information about a specific command, type help [command] in the U-Boot command line.

Image:admolition_note.png The actual command list depends on the U-Boot version, and the board configuration it was built for.

Contents

Information commands

  • bdinfo - print Board Info structure
  • coninfo - print console devices and information
  • flinfo - print FLASH memory information
  • help - print online help

Memory commands

  • base - print or set address offset
  • crc32 - checksum calculation
  • cmp - memory compare
  • cp - memory copy
  • md - memory display
  • mm - memory modify (auto incrementing)
  • mtest - simple RAM test
  • mw - memory write (fill)
  • nm - memory modify (constant address)
  • loop - infinite loop on address range

Flash memory commands

  • cp - memory copy
  • flinfo - print FLASH memory information
  • erase - erase FLASH memory
  • protect - enable or disable FLASH write protection

Image commands

  • iminfo - print header information for application image
  • imxtract - extract a part of a multi-image

Execution control commands

  • autoscr - run script from memory
  • source - run script from memory
  • bootm - boot application image from memory
  • go - start application at address 'addr'
  • loop - infinite loop on address range
  • exit - exit script

Download commands

  • bootp - boot image via network using BOOTP/TFTP protocol
  • dhcp - invoke DHCP client to obtain IP/boot params
  • loadb - load binary file over serial line (kermit mode)
  • loady - load binary file over serial line (ymodem mode)
  • loads - load S?Record file over serial line
  • rarpboot - boot image via network using RARP/TFTP protocol
  • tftpboot - boot image via network using TFTP protocol
  • nfs - boot image via network using NFS protocol
  • ping - send ICMP ECHO REQUEST to network host

Environment variables commands

  • env - environment handling commands
  • editenv - edit environment variable
  • printenv - print environment variables
  • saveenv - save environment variables to persistent storage
  • setenv - set environment variables
  • run - run commands in an environment variable
  • bootd - boot default, i.e., run 'bootcmd'
  • boot - boot default, i.e., run 'bootcmd'

File system support commands

  • fatinfo - print information about a FAT file system
  • fatload - load binary file from a FAT file system
  • fatls - list files in a FAT file system directory (default /)
  • ext2load - load binary file from a Ext2 filesystem
  • ext2ls - list files in a directory (default /)
  • fsinfo - print information about JFFS2 file system
  • fsload - load binary file from a JFFS2 file system image
  • ls - list files in a JFFS2 file system directory (default /)

NAND flash support

  • nand - NAND sub-system control
  • nandecc - switch OMAP3 NAND ECC calculation algorithm
  • nboot - boot from NAND device

Partition commands

  • mtdparts - define flash/nand partitions
  • chpart - change active partition

FDT support

  • fdt - flattened device tree utility commands

MMC support

  • mmc - MMC sub system
  • mmcinfo - display MMC information

I2C support

  • i2c - I2C sub-system control

USB support

  • usb - USB sub-system control
  • usbboot - boot from USB device

Cache support

  • icache - enable or disable instruction cache
  • dcache - enable or disable data cache

Bitmap support

  • bmp - manipulate BMP image data

GPIO support

  • gpio - manipulate gpios

Miscellaneous commands

  • echo - echo arguments to console
  • reset - Perform RESET of the CPU
  • sleep - delay execution for some time
  • version - print monitor version
  • test - minimal test, like /bin/bash
  • ? - alias for help
  • showvar - print local hushshell variables
  • true - do nothing, successfully
  • false - do nothing, unsuccessfully
  • cls - clear screen
  • itest - return true/false on integer compare
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