Linux – Busybox init does not start /etc/init.d/rcS


I'm trying to build embedded system using buildroot. Everything seems to work. All modules are starting, the system is stable. The problem is that /etc/init.d/rcS does not start during initialization of the system. If I run it manually everything is OK. I have it in my inittab file.

# /etc/inittab
# Copyright (C) 2001 Erik Andersen <>
# Note: BusyBox init doesn't support runlevels.  The runlevels field is
# completely ignored by BusyBox init. If you want runlevels, use
# sysvinit.
# Format for each entry: <id>:<runlevels>:<action>:<process>
# id        == tty to run on, or empty for /dev/console
# runlevels == ignored
# action    == one of sysinit, respawn, askfirst, wait, and once
# process   == program to run

# Startup the system
null::sysinit:/bin/mount -t proc proc /proc
null::sysinit:/bin/mount -o remount,rw /
null::sysinit:/bin/mkdir -p /dev/pts
null::sysinit:/bin/mkdir -p /dev/shm
null::sysinit:/bin/mount -a
null::sysinit:/bin/hostname -F /etc/hostname
# now run any rc scripts

# Put a getty on the serial port
ttyFIQ0::respawn:/sbin/getty -L -n ttyFIQ0 115200 vt100 # GENERIC_SERIAL

# Stuff to do for the 3-finger salute

# Stuff to do before rebooting
null::shutdown:/bin/umount -a -r
null::shutdown:/sbin/swapoff -a

Any idea what could be wrong?

Best Solution

  1. /bin/init needs to be on your filesystem.
  2. /bin/sh needs to be on your filesystem.
  3. /etc/init.d/rcS needs to be executable and have #!/bin/sh as its first line.
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