Changes for page Openwrt Notes

Last modified by Leon Poon on 2019/11/02 17:53
From version 3.1
edited by Leon Poon
on 2019/01/05 14:49
Change comment: There is no comment for this version
To version 15.1
edited by Leon Poon
on 2019/01/06 10:14
Change comment: There is no comment for this version

Summary

Details

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Title
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1 -Openwrt Boot Notes
1 +Openwrt Notes
Content
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8 8  
9 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 14  * kmodloader in subprocess (waits until done)
... ... @@ -17,4 +17,61 @@
17 17  ** /etc/preinit in subprocess
18 18  * when /etc/preinit is done then it execvp the "real" /sbin/procd
19 19  
20 -
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 hostname
48 +* set root password
49 +* /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?)
50 +* apt-get install net-tools file ntp openssh-server gcc
51 +** net-tools for ifconfig
52 +** gcc for?
53 +* read-only root
54 +
55 +Needs CONFIG_DEVTMPFS=y in kernel.
56 +
57 +{{code language="bash"}}
58 +mkdir -pv /mnt && mknod /dev/sda b 8 0 && cryptsetup open /dev/sda usb && vgchange -ay vol_grp1 && mount /dev/vol_grp1/logical_vol1 /mnt
59 +{{/code}}
60 +
61 +{{code language="bash"}}
62 +chroot /mnt /bin/bash
63 +{{/code}}
64 +
65 +{{code language="bash"}}
66 +mount proc /proc -t proc
67 +{{/code}}
68 +
69 +{{code language="bash"}}
70 +exec switch_root /mnt /sbin/init
71 +{{/code}}
72 +
73 +{{code language="bash"}}
74 +ip addr add dev eth0 IP/NM
75 +ip link set eth0 up
76 +ip route add default via GW
77 +{{/code}}