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Changes for page Openwrt Notes

Last modified by Leon Poon on 2019/11/02 17:53
From version 49.1
edited by Leon Poon
on 2019/11/02 06:46
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 -= Modules =
43 -
44 -{{code}}
45 -cp -va ./build_dir/target-*/linux-*/linux-4*/modules.builtin ./staging_dir/target-*/root-*/lib/modules/4*
46 -# tar -C ./staging_dir/target-*/root-*/ -vcjf modules.tar.bz2 lib/modules
47 -{{/code}}
48 -
49 -= Debian =
50 -
51 -{{code}}
52 -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
53 -chroot $PWD debootstrap/debootstrap --second-stage
54 -{{/code}}
55 -
56 -{{code}}
57 -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 $PWD
58 -{{/code}}
59 -
60 -Do not install openssh-server during bootstrap otherwise it will bring in systemd!
61 -
62 -Things to do after debootstrap:
63 -
64 -* [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]]
65 -* dpkg-reconfigure locales
66 -* set hostname
67 -* set root password (or .ssh authorized_keys)
68 -* fstab
69 -* /etc/network/interfaces
70 -* apt-get install ~-~-no-install-recommends openssh-server (check that it is without libpam-systemd and systemd!!)
71 -* apt-get install net-tools file ntp openssh-server gcc lvm2
72 -** net-tools for ifconfig
73 -** gcc for?
74 -* echo vm.min_free_kbytes=16384 > /etc/sysctl.d/min_free_kbytes.conf
75 -* apt-get install kmod (depmod, etc)
76 -* kernel modules ( tar ~-~-owner=0 ~-~-group=0  -C ./staging_dir/target-*/root-*/ -vcjf - lib/modules | ssh TARGET_IP tar -C /chroot -vxjf - )
77 -* depmod
78 -* inittab - serial console
79 -* read-only root
80 -
81 -Needs CONFIG_DEVTMPFS=y in kernel.
82 -
83 -{{code language="bash"}}
84 -mkdir -pv /mnt &&
85 -mknod /dev/sda b 8 0 &&
86 -cryptsetup open /dev/sda usb &&
87 -vgchange -ay vol_grp1 &&
88 -mount /dev/vol_grp1/logical_vol1 /mnt -o ro
89 -{{/code}}
90 -
91 -{{code language="bash"}}
92 -chroot /mnt /bin/bash
93 -{{/code}}
94 -
95 -{{code language="bash"}}
96 -mount proc /proc -t proc
97 -{{/code}}
98 -
99 -{{code language="bash"}}
100 -exec switch_root /mnt /sbin/init
101 -{{/code}}
102 -
103 -{{code language="bash"}}
104 -ip addr add dev eth0 IP/NM
105 -ip link set eth0 up
106 -ip route add default via GW
107 -{{/code}}
108 -
109 -= Network =
110 -
111 -{{code language="bash"}}
112 -sed -re 's/^boot_run_hook/#\0/g' -i /etc/preinit
113 -PREINIT=1 . /etc/preinit
114 -preinit_config_board # set up the switch and lan ports on eth0.2, and create ip link
115 -json_select switch
116 -json_select switch0
117 -json_add_boolean reset 0 # do not reset when setting up wan ports on eth0.1
118 -json_select ..
119 -json_select ..
120 -preinit_config_switch switch0 eth0.1 # set up wan ports
121 -preinit_ip_config eth0.1 # create ip link
122 -ip address flush dev eth0 # del default address
123 -for pi_ifname in eth0.1 eth0.2; do
124 - ip -4 address flush dev $pi_ifname # del default address
125 - ip link set dev $pi_ifname down
126 -done
127 -{{/code}}
128 -
129 -
130 -= UBI =
131 -
132 -{{code language="text"}}
133 -define Build/append-ubi
134 - sh $(TOPDIR)/scripts/ubinize-image.sh \
135 - $(if $(UBOOTENV_IN_UBI),--uboot-env) \
136 - $(if $(KERNEL_IN_UBI),--kernel $(IMAGE_KERNEL)) \
137 - $(foreach part,$(UBINIZE_PARTS),--part $(part)) \
138 - $(IMAGE_ROOTFS) \
139 - $@.tmp \
140 - -p $(BLOCKSIZE:%k=%KiB) -m $(PAGESIZE) \
141 - $(if $(SUBPAGESIZE),-s $(SUBPAGESIZE)) \
142 - $(if $(VID_HDR_OFFSET),-O $(VID_HDR_OFFSET)) \
143 - $(UBINIZE_OPTS)
144 - cat $@.tmp >> $@
145 - rm $@.tmp
146 -endef
147 -{{/code}}
20 +