Wiki source code of Openwrt Notes

Version 44.1 by Leon Poon on 2019/11/02 06:33

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
38.1	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
39.1	47	{{/code}}
38.1	48
5.1	49	= Debian =
	50
30.1	51	{{code}}
35.1	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
33.1	53	chroot $PWD debootstrap/debootstrap --second-stage
32.1	54	{{/code}}
	55
	56	{{code}}
40.1	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
30.1	58	{{/code}}
	59
35.1	60	Do not install openssh-server during bootstrap otherwise it will bring in systemd!
	61
11.1	62	Things to do after debootstrap:
5.1	63
11.1	64	* [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]]
44.1	65	* dpkg-reconfigure locales
13.1	66	* set hostname
11.1	67	* set root password
	68	* /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?)
36.1	69	* apt-get install ~-~-no-install-recommends openssh-server (check that it is without libpam-systemd and systemd!!)
44.1	70	* apt-get install net-tools file ntp openssh-server gcc lvm2
15.1	71	** net-tools for ifconfig
14.1	72	** gcc for?
37.1	73	* echo vm.min_free_kbytes=16384 > /etc/sysctl.d/min_free_kbytes.conf
41.1	74	* apt-get install kmod (depmod, etc)
43.1	75	* kernel modules ( tar ~-~-owner=0 ~-~-group=0 -C ./staging_dir/target-/root-/ -vcjf - lib/modules \| ssh TARGET_IP tar -C /chroot -vxjf - )
42.1	76	* depmod
11.1	77	* read-only root
	78
	79	Needs CONFIG_DEVTMPFS=y in kernel.
	80
9.1	81	{{code language="bash"}}
19.1	82	mkdir -pv /mnt &&
	83	mknod /dev/sda b 8 0 &&
	84	cryptsetup open /dev/sda usb &&
	85	vgchange -ay vol_grp1 &&
	86	mount /dev/vol_grp1/logical_vol1 /mnt -o ro
10.1	87	{{/code}}
	88
	89	{{code language="bash"}}
13.1	90	chroot /mnt /bin/bash
10.1	91	{{/code}}
	92
	93	{{code language="bash"}}
	94	mount proc /proc -t proc
	95	{{/code}}
	96
	97	{{code language="bash"}}
13.1	98	exec switch_root /mnt /sbin/init
6.1	99	{{/code}}
	100
9.1	101	{{code language="bash"}}
	102	ip addr add dev eth0 IP/NM
8.1	103	ip link set eth0 up
9.1	104	ip route add default via GW
7.1	105	{{/code}}
16.1	106
	107	= Network =
	108
	109	{{code language="bash"}}
22.1	110	sed -re 's/^boot_run_hook/#\0/g' -i /etc/preinit
	111	PREINIT=1 . /etc/preinit
26.1	112	preinit_config_board # set up the switch and lan ports on eth0.2, and create ip link
23.1	113	json_select switch
	114	json_select switch0
	115	json_add_boolean reset 0 # do not reset when setting up wan ports on eth0.1
	116	json_select ..
	117	json_select ..
26.1	118	preinit_config_switch switch0 eth0.1 # set up wan ports
	119	preinit_ip_config eth0.1 # create ip link
25.1	120	ip address flush dev eth0 # del default address
20.1	121	for pi_ifname in eth0.1 eth0.2; do
23.1	122	ip -4 address flush dev $pi_ifname # del default address
25.1	123	ip link set dev $pi_ifname down
20.1	124	done
16.1	125	{{/code}}
27.1	126
	127
	128	= UBI =
	129
30.1	130	{{code language="text"}}define Build/append-ubi
27.1	131	sh $(TOPDIR)/scripts/ubinize-image.sh \
	132	$(if $(UBOOTENV_IN_UBI),--uboot-env) \
	133	$(if $(KERNEL_IN_UBI),--kernel $(IMAGE_KERNEL)) \
	134	$(foreach part,$(UBINIZE_PARTS),--part $(part)) \
	135	$(IMAGE_ROOTFS) \
	136	$@.tmp \
	137	-p $(BLOCKSIZE:%k=%KiB) -m $(PAGESIZE) \
	138	$(if $(SUBPAGESIZE),-s $(SUBPAGESIZE)) \
	139	$(if $(VID_HDR_OFFSET),-O $(VID_HDR_OFFSET)) \
	140	$(UBINIZE_OPTS)
	141	cat $@.tmp >> $@
	142	rm $@.tmp
31.1	143	endef{{/code}}
30.1	144	~{~{/code}}
40.1	145	~{~{/code}}

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