Wiki source code of Openwrt Notes
Hide last authors
| author | version | line-number | content |
|---|---|---|---|
 |
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 | |||
| |
2.1 | 9 | /sbin/init is ELF comes from procd package. What it does (as pid=1): |
| |
1.1 | 10 | |
| |
4.1 | 11 | * early (different from procd early): |
| |
1.1 | 12 | ** mount /proc, /sysfs, and create /dev nodes, create /tmp subdirs etc |
| 13 | ** set PATH | ||
| |
3.1 | 14 | * kmodloader in subprocess (waits until done) |
| |
1.1 | 15 | * preinit |
| 16 | ** plugd in subprocess (seem to deal with firmware) | ||
| 17 | ** /etc/preinit in subprocess | ||
| |
2.1 | 18 | * when /etc/preinit is done then it execvp the "real" /sbin/procd |
| |
1.1 | 19 | |
| |
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 | |||
| |
5.1 | 42 | = Debian = |
| 43 | |||
| |
11.1 | 44 | Things to do after debootstrap: |
| |
5.1 | 45 | |
| |
11.1 | 46 | * [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]] |
| |
13.1 | 47 | * set hostname |
| |
11.1 | 48 | * set root password |
| 49 | * /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?) | ||
| |
13.1 | 50 | * apt-get install file ntp openssh-server |
| |
11.1 | 51 | * read-only root |
| 52 | |||
| 53 | Needs CONFIG_DEVTMPFS=y in kernel. | ||
| 54 | |||
| |
9.1 | 55 | {{code language="bash"}} |
| |
13.1 | 56 | 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 |
| |
10.1 | 57 | {{/code}} |
| 58 | |||
| 59 | {{code language="bash"}} | ||
| |
13.1 | 60 | chroot /mnt /bin/bash |
| |
10.1 | 61 | {{/code}} |
| 62 | |||
| 63 | {{code language="bash"}} | ||
| 64 | mount proc /proc -t proc | ||
| 65 | {{/code}} | ||
| 66 | |||
| 67 | {{code language="bash"}} | ||
| |
13.1 | 68 | exec switch_root /mnt /sbin/init |
| |
6.1 | 69 | {{/code}} |
| 70 | |||
| |
9.1 | 71 | {{code language="bash"}} |
| 72 | ip addr add dev eth0 IP/NM | ||
| |
8.1 | 73 | ip link set eth0 up |
| |
9.1 | 74 | ip route add default via GW |
| |
7.1 | 75 | {{/code}} |