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Changes for page Openwrt Notes

Last modified by Leon Poon on 2019/11/02 17:53
From version 37.1
edited by Leon Poon
on 2019/11/02 06:04
Change comment: There is no comment for this version
To version 3.1
edited by Leon Poon
on 2019/01/05 14:49
Change comment: There is no comment for this version

Summary

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Title
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1 -Openwrt Notes
1 +Openwrt Boot 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 (different from procd early):
11 +* 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)
... ... @@ -17,117 +17,4 @@
17 17  ** /etc/preinit in subprocess
18 18  * when /etc/preinit is done then it execvp 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 -{{code}}
45 -debootstrap --variant=minbase --include locales,sudo,sysvinit-core,sysvinit-utils,vim-nox,screen,wget,ntp,bridge-utils,ifupdown --exclude=nano,vim-tiny --foreign stretch $PWD
46 -chroot $PWD debootstrap/debootstrap --second-stage
47 -{{/code}}
48 -
49 -{{code}}
50 -qemu-debootstrap --include=locales,sudo,sysvinit-core,sysvinit-utils,vim-nox,screen,wget,ntp,bridge-utils,ifupdown --exclude=nano,vim-tiny,systemd,systemd-sysv --arch mipsel stretch /mnt/cdrom
51 -{{/code}}
52 -
53 -Do not install openssh-server during bootstrap otherwise it will bring in systemd!
54 -
55 -Things to do after debootstrap:
56 -
57 -* [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]]
58 -* set hostname
59 -* set root password
60 -* /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?)
61 -* apt-get install ~-~-no-install-recommends openssh-server (check that it is without libpam-systemd and systemd!!)
62 -* apt-get install net-tools file ntp openssh-server gcc
63 -** net-tools for ifconfig
64 -** gcc for?
65 -* echo vm.min_free_kbytes=16384 > /etc/sysctl.d/min_free_kbytes.conf
66 -* read-only root
67 -
68 -Needs CONFIG_DEVTMPFS=y in kernel.
69 -
70 -{{code language="bash"}}
71 -mkdir -pv /mnt &&
72 -mknod /dev/sda b 8 0 &&
73 -cryptsetup open /dev/sda usb &&
74 -vgchange -ay vol_grp1 &&
75 -mount /dev/vol_grp1/logical_vol1 /mnt -o ro
76 -{{/code}}
77 -
78 -{{code language="bash"}}
79 -chroot /mnt /bin/bash
80 -{{/code}}
81 -
82 -{{code language="bash"}}
83 -mount proc /proc -t proc
84 -{{/code}}
85 -
86 -{{code language="bash"}}
87 -exec switch_root /mnt /sbin/init
88 -{{/code}}
89 -
90 -{{code language="bash"}}
91 -ip addr add dev eth0 IP/NM
92 -ip link set eth0 up
93 -ip route add default via GW
94 -{{/code}}
95 -
96 -= Network =
97 -
98 -{{code language="bash"}}
99 -sed -re 's/^boot_run_hook/#\0/g' -i /etc/preinit
100 -PREINIT=1 . /etc/preinit
101 -preinit_config_board # set up the switch and lan ports on eth0.2, and create ip link
102 -json_select switch
103 -json_select switch0
104 -json_add_boolean reset 0 # do not reset when setting up wan ports on eth0.1
105 -json_select ..
106 -json_select ..
107 -preinit_config_switch switch0 eth0.1 # set up wan ports
108 -preinit_ip_config eth0.1 # create ip link
109 -ip address flush dev eth0 # del default address
110 -for pi_ifname in eth0.1 eth0.2; do
111 - ip -4 address flush dev $pi_ifname # del default address
112 - ip link set dev $pi_ifname down
113 -done
114 -{{/code}}
115 -
116 -
117 -= UBI =
118 -
119 -{{code language="text"}}define Build/append-ubi
120 - sh $(TOPDIR)/scripts/ubinize-image.sh \
121 - $(if $(UBOOTENV_IN_UBI),--uboot-env) \
122 - $(if $(KERNEL_IN_UBI),--kernel $(IMAGE_KERNEL)) \
123 - $(foreach part,$(UBINIZE_PARTS),--part $(part)) \
124 - $(IMAGE_ROOTFS) \
125 - $@.tmp \
126 - -p $(BLOCKSIZE:%k=%KiB) -m $(PAGESIZE) \
127 - $(if $(SUBPAGESIZE),-s $(SUBPAGESIZE)) \
128 - $(if $(VID_HDR_OFFSET),-O $(VID_HDR_OFFSET)) \
129 - $(UBINIZE_OPTS)
130 - cat $@.tmp >> $@
131 - rm $@.tmp
132 -endef{{/code}}
133 -~{~{/code}}
20 +