Changes for page Openwrt Notes

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• Page properties (2 modified, 0 added, 0 removed)

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Title

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1		-Openwrt Boot Notes
	1	+Openwrt Notes

Content

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6	6
7	7	/init is a script which sets INITRAMFS=1 and then execs /sbin/init.
8	8
9		-/sbin/init is ELF comes from procd package. What it does:
	9	+/sbin/init is ELF comes from procd package. What it does (as pid=1):
10	10
11		-* early:
	11	+* early (different from procd early):
12	12	** mount /proc, /sysfs, and create /dev nodes, create /tmp subdirs etc
13	13	** set PATH
14		-* kmodloader in subprocess
	14	+* kmodloader in subprocess (waits until done)
15	15	* preinit
16	16	** plugd in subprocess (seem to deal with firmware)
17	17	** /etc/preinit in subprocess
18		-* when /etc/preinit is done then it execs and replaces itself with the "real" /sbin/procd
	18	+* when /etc/preinit is done then it execvp the "real" /sbin/procd
19	19
	20	+
	21	+procd states:
	22	+
	23	+* early (first state):
	24	+** coldplug (remount /dev, etc)
	25	+*** start udevtrigger in subproc
	26	+*** when udevtrigger completes, hotplug
	27	+*** when hotplug completes, next state (ubus)
	28	+* ubus:
	29	+** start attempts to connect to ubs
	30	+** start ubus as service
	31	+** once connection's done then next state (init)
	32	+* init - read /etc/inittab and run:
	33	+** respawn - things that need to keep rerunning once quitted
	34	+** askconsole
	35	+** askfirst - the "Press Enter to activate this console" message
	36	+** sysinit - (usually /etc/init.d/rcS with S) and then next state (running)
	37	+* running - waits for shutdown signal (usr1/usr2) or reboot (int/term)
	38	+* shutdown
	39	+** runs shutdown command per inittab (also /etc/init.d/rcS but with K)
	40	+** when done next state (halt)
	41	+* halt - kill everything and either enter sleep loop or reboots
	42	+
	43	+
	44	+
	45	+
	46	+= Debian =
	47	+
	48	+Needs devtmpfs in kernel (this seem to be first thing that /sbin/init does.
	49	+
20	20