Changes for page Openwrt Notes

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1		-Openwrt Boot Notes
	1	+Openwrt 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:
	11	+* early (different from procd early):
12	12	** mount /proc, /sysfs, and create /dev nodes, create /tmp subdirs etc
13	13	** set PATH
14		-* kmodloader in subprocess
	14	+* kmodloader in subprocess (waits until done)
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		-
	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}}