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 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
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