Wiki source code of Openwrt Notes
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| author | version | line-number | content |
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1.1 | 1 | |
| 2 | |||
| 3 | = initramfs-kernel = | ||
| 4 | |||
| 5 | kernel runs /init. | ||
| 6 | |||
| 7 | /init is a script which sets INITRAMFS=1 and then execs /sbin/init. | ||
| 8 | |||
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2.1 | 9 | /sbin/init is ELF comes from procd package. What it does (as pid=1): |
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1.1 | 10 | |
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4.1 | 11 | * early (different from procd early): |
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1.1 | 12 | ** mount /proc, /sysfs, and create /dev nodes, create /tmp subdirs etc |
| 13 | ** set PATH | ||
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3.1 | 14 | * kmodloader in subprocess (waits until done) |
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1.1 | 15 | * preinit |
| 16 | ** plugd in subprocess (seem to deal with firmware) | ||
| 17 | ** /etc/preinit in subprocess | ||
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2.1 | 18 | * when /etc/preinit is done then it execvp the "real" /sbin/procd |
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1.1 | 19 | |
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4.1 | 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 | |||
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5.1 | 42 | = Debian = |
| 43 | |||
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30.1 | 44 | {{code}} |
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35.1 | 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 |
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33.1 | 46 | chroot $PWD debootstrap/debootstrap --second-stage |
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32.1 | 47 | {{/code}} |
| 48 | |||
| 49 | {{code}} | ||
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35.1 | 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 |
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30.1 | 51 | {{/code}} |
| 52 | |||
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35.1 | 53 | Do not install openssh-server during bootstrap otherwise it will bring in systemd! |
| 54 | |||
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11.1 | 55 | Things to do after debootstrap: |
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5.1 | 56 | |
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11.1 | 57 | * [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]] |
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13.1 | 58 | * set hostname |
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11.1 | 59 | * set root password |
| 60 | * /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?) | ||
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36.1 | 61 | * apt-get install ~-~-no-install-recommends openssh-server (check that it is without libpam-systemd and systemd!!) |
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15.1 | 62 | * apt-get install net-tools file ntp openssh-server gcc |
| 63 | ** net-tools for ifconfig | ||
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14.1 | 64 | ** gcc for? |
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37.1 | 65 | * echo vm.min_free_kbytes=16384 > /etc/sysctl.d/min_free_kbytes.conf |
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11.1 | 66 | * read-only root |
| 67 | |||
| 68 | Needs CONFIG_DEVTMPFS=y in kernel. | ||
| 69 | |||
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9.1 | 70 | {{code language="bash"}} |
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19.1 | 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 | ||
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10.1 | 76 | {{/code}} |
| 77 | |||
| 78 | {{code language="bash"}} | ||
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13.1 | 79 | chroot /mnt /bin/bash |
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10.1 | 80 | {{/code}} |
| 81 | |||
| 82 | {{code language="bash"}} | ||
| 83 | mount proc /proc -t proc | ||
| 84 | {{/code}} | ||
| 85 | |||
| 86 | {{code language="bash"}} | ||
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13.1 | 87 | exec switch_root /mnt /sbin/init |
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6.1 | 88 | {{/code}} |
| 89 | |||
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9.1 | 90 | {{code language="bash"}} |
| 91 | ip addr add dev eth0 IP/NM | ||
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8.1 | 92 | ip link set eth0 up |
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9.1 | 93 | ip route add default via GW |
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7.1 | 94 | {{/code}} |
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16.1 | 95 | |
| 96 | = Network = | ||
| 97 | |||
| 98 | {{code language="bash"}} | ||
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22.1 | 99 | sed -re 's/^boot_run_hook/#\0/g' -i /etc/preinit |
| 100 | PREINIT=1 . /etc/preinit | ||
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26.1 | 101 | preinit_config_board # set up the switch and lan ports on eth0.2, and create ip link |
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23.1 | 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 .. | ||
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26.1 | 107 | preinit_config_switch switch0 eth0.1 # set up wan ports |
| 108 | preinit_ip_config eth0.1 # create ip link | ||
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25.1 | 109 | ip address flush dev eth0 # del default address |
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20.1 | 110 | for pi_ifname in eth0.1 eth0.2; do |
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23.1 | 111 | ip -4 address flush dev $pi_ifname # del default address |
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25.1 | 112 | ip link set dev $pi_ifname down |
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20.1 | 113 | done |
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16.1 | 114 | {{/code}} |
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27.1 | 115 | |
| 116 | |||
| 117 | = UBI = | ||
| 118 | |||
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30.1 | 119 | {{code language="text"}}define Build/append-ubi |
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27.1 | 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 | ||
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31.1 | 132 | endef{{/code}} |
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30.1 | 133 | ~{~{/code}} |