is the parent of all processes on the system. The boot process can be faster if
.B fastinit
has PID 1 during the booting of the system.
The behaviour of
.B fastinit
can be controlled using runlevels.
To run
.B fastinit
as the first process (PID 1), edit the kernel command-line
.BR /bootfs/cmdline.txt
and append the following line. Note that this file contains only one single line separated by spaces. It is suggested that this file is edited in another system, as errors in command-line may cause kernel panic and stop the system from booting.
.in +4
.nf
.B init=/usr/sbin/fastinit.sh \fIrunlevel\fP
.fi
.in
.SH RUNLEVEL
.B fastinit
supports several runlevels, which represent different states of the system. These include:
.TP
.B 0
Halt the system. Invokes
.B /sbin/poweroff -f
.TP
.B 1
Single-user mode. Supports serial, teletypes, proc, sysfs, GPIO. Bootfs is read-only. GPIO 23 (Pin 16) is set to high when boot is completed.
.TP
.B 5
SysVinit runlevel 5. Invokes
.B /sbin/init 5
.TP
.B 6
Reboot the system. Invokes
.B /sbin/reboot -f
.SH SIGNALS
.B fastinit
responds to a number of signals:
.TP
.BR SIGHUP "(1)"
Reboot.
.TP
.BR SIGINT "(2)"
Reboot.
.TP
.BR SIGTERM "(15)"
Poweroff.
.SH SEE ALSO
.BR init (8),
.BR poweroff (8),
.BR reboot (8),
.BR busybox (1),
.BR mount (8)
.SH AUTHOR
The
.B fastinit
script was first written by Qiyang Sun <qs2g22@soton.ac.uk>, and is maintained by the MAR24 project maintainers.
