2. Reference

2.1. Environment variables

abortcmd

command (list) that is executed when the boot delay is aborted

abortparams

contains additional parameters to control the abort of the boot delay, can be either

key {key-nr}

or

gpio {gpio-nr} [high-active]

arguments:

key-nr

key number as specified in linux/input.h

gpio-nr

GPIO number as described here: http://www.armbedded.eu/node/258

high-active

specifies if the GPIO should be high active, every number greater 0 means high active, everything else (even leaving it out) means low active

bootcmd

command (list) that is executed after the boot delay

bootdelay

delay between the execution of precmd and bootcmd, can be aborted by a key press

bootdevices

white space separated list of devices that a search for bootable system by the autoboot command

delay_device

delay in seconds that the autoboot command should wait before trying to look for a bootable system on device, can be needed for devices that are enumerated asynchronously

fstype_device

filesystem type used by the autoboot when mounting device, can be empty most of the time, when not using a flash filesystems

kexecoptions

extra options used by the autoboot when invoking kexec

loopcmd

command (list) that, if defined, gets executed in a loop after either bootcmd or abortcmd finishes

options_device

mount options used by the autoboot when mounting device, default to "ro"

precmd

command (list) that is executed on every boot before the boot delay

stdin, stdout, stderr

contain the device file, which is used to get input or print output and error messages, defaults to /dev/ttyS0