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Changes for page Openwrt Notes

Last modified by Leon Poon on 2019/11/02 17:53
From version 32.1
edited by Leon Poon
on 2019/11/02 05:33
Change comment: There is no comment for this version
To version 2.1
edited by Leon Poon
on 2019/01/05 14:46
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 -* 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 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,openssh-server --exclude=nano,vim-tiny --foreign stretch $PWD
46 -debootstrap/debootstrap --second-stage
47 -{{/code}}
48 -
49 -{{code}}
50 -qemu-debootstrap --include=locales,sudo,sysvinit-core,sysvinit-utils,vim-nox,openssh-server --exclude=nano,vim-tiny,systemd,systemd-sysv --arch mipsel stretch /mnt/cdrom
51 -{{/code}}
52 -
53 -Things to do after debootstrap:
54 -
55 -* [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]]
56 -* set hostname
57 -* set root password
58 -* /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?)
59 -* apt-get install net-tools file ntp openssh-server gcc
60 -** net-tools for ifconfig
61 -** gcc for?
62 -* read-only root
63 -
64 -Needs CONFIG_DEVTMPFS=y in kernel.
65 -
66 -{{code language="bash"}}
67 -mkdir -pv /mnt &&
68 -mknod /dev/sda b 8 0 &&
69 -cryptsetup open /dev/sda usb &&
70 -vgchange -ay vol_grp1 &&
71 -mount /dev/vol_grp1/logical_vol1 /mnt -o ro
72 -{{/code}}
73 -
74 -{{code language="bash"}}
75 -chroot /mnt /bin/bash
76 -{{/code}}
77 -
78 -{{code language="bash"}}
79 -mount proc /proc -t proc
80 -{{/code}}
81 -
82 -{{code language="bash"}}
83 -exec switch_root /mnt /sbin/init
84 -{{/code}}
85 -
86 -{{code language="bash"}}
87 -ip addr add dev eth0 IP/NM
88 -ip link set eth0 up
89 -ip route add default via GW
90 -{{/code}}
91 -
92 -= Network =
93 -
94 -{{code language="bash"}}
95 -sed -re 's/^boot_run_hook/#\0/g' -i /etc/preinit
96 -PREINIT=1 . /etc/preinit
97 -preinit_config_board # set up the switch and lan ports on eth0.2, and create ip link
98 -json_select switch
99 -json_select switch0
100 -json_add_boolean reset 0 # do not reset when setting up wan ports on eth0.1
101 -json_select ..
102 -json_select ..
103 -preinit_config_switch switch0 eth0.1 # set up wan ports
104 -preinit_ip_config eth0.1 # create ip link
105 -ip address flush dev eth0 # del default address
106 -for pi_ifname in eth0.1 eth0.2; do
107 - ip -4 address flush dev $pi_ifname # del default address
108 - ip link set dev $pi_ifname down
109 -done
110 -{{/code}}
111 -
112 -
113 -= UBI =
114 -
115 -{{code language="text"}}define Build/append-ubi
116 - sh $(TOPDIR)/scripts/ubinize-image.sh \
117 - $(if $(UBOOTENV_IN_UBI),--uboot-env) \
118 - $(if $(KERNEL_IN_UBI),--kernel $(IMAGE_KERNEL)) \
119 - $(foreach part,$(UBINIZE_PARTS),--part $(part)) \
120 - $(IMAGE_ROOTFS) \
121 - $@.tmp \
122 - -p $(BLOCKSIZE:%k=%KiB) -m $(PAGESIZE) \
123 - $(if $(SUBPAGESIZE),-s $(SUBPAGESIZE)) \
124 - $(if $(VID_HDR_OFFSET),-O $(VID_HDR_OFFSET)) \
125 - $(UBINIZE_OPTS)
126 - cat $@.tmp >> $@
127 - rm $@.tmp
128 -endef{{/code}}
129 -~{~{/code}}
20 +