Changes for page Openwrt Notes

Last modified by Leon Poon on 2019/11/02 17:53
From version 11.1
edited by Leon Poon
on 2019/01/06 09:40
Change comment: There is no comment for this version
To version 1.1
edited by Leon Poon
on 2019/01/05 14:43
Change comment: There is no comment for this version

Summary

Details

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Title
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1 -Openwrt Notes
1 +Openwrt Boot 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 (as pid=1):
9 +/sbin/init is ELF comes from procd package. What it does:
10 10  
11 -* early (different from procd early):
11 +* early:
12 12  ** mount /proc, /sysfs, and create /dev nodes, create /tmp subdirs etc
13 13  ** set PATH
14 -* kmodloader in subprocess (waits until done)
14 +* kmodloader in subprocess
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 execvp the "real" /sbin/procd
18 +* when /etc/preinit is done then it execs and replaces itself with the "real" /sbin/procd
19 19  
20 -procd states:
21 -
22 -* early (first state):
23 -** coldplug (remount /dev, etc)
24 -*** start udevtrigger in subproc
25 -*** when udevtrigger completes, hotplug
26 -*** when hotplug completes, next state (ubus)
27 -* ubus:
28 -** start attempts to connect to ubs
29 -** start ubus as service
30 -** once connection's done then next state (init)
31 -* init - read /etc/inittab and run:
32 -** respawn - things that need to keep rerunning once quitted
33 -** askconsole
34 -** askfirst - the "Press Enter to activate this console" message
35 -** sysinit - (usually /etc/init.d/rcS with S) and then next state (running)
36 -* running - waits for shutdown signal (usr1/usr2) or reboot (int/term)
37 -* shutdown
38 -** runs shutdown command per inittab (also /etc/init.d/rcS but with K)
39 -** when done next state (halt)
40 -* halt - kill everything and either enter sleep loop or reboots
41 -
42 -= Debian =
43 -
44 -Things to do after debootstrap:
45 -
46 -* [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]]
47 -* set root password
48 -* install openssh-server
49 -* /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?)
50 -* read-only root
51 -
52 -Needs CONFIG_DEVTMPFS=y in kernel.
53 -
54 -{{code language="bash"}}
55 -mkdir -pv /mnt/debian && mknod /dev/sda b 8 0 && cryptsetup open /dev/sda usb && vgchange -ay vol_grp1 && mount /dev/vol_grp1/logical_vol1 /mnt/debian
56 -{{/code}}
57 -
58 -{{code language="bash"}}
59 -chroot /mnt/debian /bin/bash
60 -{{/code}}
61 -
62 -{{code language="bash"}}
63 -mount proc /proc -t proc
64 -{{/code}}
65 -
66 -{{code language="bash"}}
67 -exec switch_root /mnt/debian /sbin/init
68 -{{/code}}
69 -
70 -{{code language="bash"}}
71 -ip addr add dev eth0 IP/NM
72 -ip link set eth0 up
73 -ip route add default via GW
74 -{{/code}}
20 +