请教下，切换根目录应该在哪一步切换，povit_root /merged /merged/rom。我尝试了在inittab中，执行rcS之前，执行是对的，但就是一直报 can't open /dev/console: No such file or directory和can't open /dev/ttyGS0: No such file or directory
# /etc/inittab
#
# Copyright (C) 2001 Erik Andersen <andersen@codepoet.org>
#
# Note: BusyBox init doesn't support runlevels. The runlevels field is
# completely ignored by BusyBox init. If you want runlevels, use
# sysvinit.
#
# Format for each entry: <id>:<runlevels>:<action>:<process>
#
# id == tty to run on, or empty for /dev/console
# runlevels == ignored
# action == one of sysinit, respawn, askfirst, wait, and once
# process == program to run
# Startup the system
::sysinit:/bin/mount -t proc proc /proc
::sysinit:/bin/mount -o remount,rw /
::sysinit:/bin/mkdir -p /dev/pts /dev/shm
::sysinit:/bin/mount -a
::sysinit:/sbin/swapon -a
null::sysinit:/bin/ln -sf /proc/self/fd /dev/fd
null::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin
null::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout
null::sysinit:/bin/ln -sf /proc/self/fd/2 /dev/stderr
::sysinit:/bin/hostname -F /etc/hostname
# Load Wifi driver
::sysinit:/sbin/modprobe r8723bs
# now run any rc scripts
::sysinit:mount -n -t overlay overlayfs:/overlay -o lowerdir=/,upperdir=/overlay/upper,workdir=/overlay/workdir /merged/
::sysinit:pivot_root /merged /merged/rom
::sysinit:/etc/init.d/rcS
# Put a getty on the serial port
ttyGS0::respawn:/sbin/getty -L ttyGS0 0 vt100 # GENERIC_SERIAL
console::respawn:/sbin/getty -L console 0 vt100 # GENERIC_SERIAL
# Stuff to do for the 3-finger salute
#::ctrlaltdel:/sbin/reboot
# Stuff to do before rebooting
::shutdown:/etc/init.d/rcK
::shutdown:/sbin/swapoff -a
::shutdown:/bin/umount -a -r系统启动日志
U-Boot 2018.01-05679-g013ca45-dirty (Jul 08 2019 - 05:04:44 -0700) Allwinner Technology
CPU: Allwinner F Series (SUNIV)
Model: Lichee Pi Nano
DRAM: 64 MiB
MMC: SUNXI SD/MMC: 0
SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB
*** Warning - bad CRC, using default environment
In: serial@1c25000
Out: serial@1c25000
Err: serial@1c25000
Net: No ethernet found.
starting USB...
No controllers found
Hit any key to stop autoboot: 0
SF: Detected w25q128bv with page size 256 Bytes, erase size 4 KiB, total 16 MiB
device 0 offset 0x70000, size 0x10000
SF: 65536 bytes @ 0x70000 Read: OK
device 0 offset 0x80000, size 0x400000
SF: 4194304 bytes @ 0x80000 Read: OK
## Flattened Device Tree blob at 80c00000
Booting using the fdt blob at 0x80c00000
Loading Device Tree to 816fa000, end 816ff43e ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.15.0-rc8-licheepi-nano+ (njatech@ubuntu) (gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)) #55 Tue Aug 27 00:47:58 PDT 2019
[ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
[ 0.000000] CPU: VIVT data cache, VIVT instruction cache
[ 0.000000] OF: fdt: Machine model: Lichee Pi Nano
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] random: fast init done
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: console=ttyS0,115200 panic=5 rootwait root=/dev/mtdblock3 rw rootfstype=squashfs
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Memory: 56232K/65536K available (5120K kernel code, 217K rwdata, 1040K rodata, 1024K init, 221K bss, 9304K reserved, 0K cma-reserved, 0K highmem)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
[ 0.000000] vmalloc : 0xc4800000 - 0xff800000 ( 944 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xc4000000 ( 64 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0x(ptrval) - 0x(ptrval) (6112 kB)
[ 0.000000] .init : 0x(ptrval) - 0x(ptrval) (1024 kB)
[ 0.000000] .data : 0x(ptrval) - 0x(ptrval) ( 218 kB)
[ 0.000000] .bss : 0x(ptrval) - 0x(ptrval) ( 222 kB)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000045] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000110] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000639] Console: colour dummy device 80x30
[ 0.000726] Calibrating delay loop... 203.16 BogoMIPS (lpj=1015808)
[ 0.070229] pid_max: default: 32768 minimum: 301
[ 0.070535] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.070576] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.071946] CPU: Testing write buffer coherency: ok
[ 0.073508] Setting up static identity map for 0x80100000 - 0x80100058
[ 0.075989] devtmpfs: initialized
[ 0.082758] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.082820] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.083069] pinctrl core: initialized pinctrl subsystem
[ 0.084984] NET: Registered protocol family 16
[ 0.086191] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.087888] cpuidle: using governor menu
[ 0.106547] SCSI subsystem initialized
[ 0.106848] usbcore: registered new interface driver usbfs
[ 0.106987] usbcore: registered new interface driver hub
[ 0.107161] usbcore: registered new device driver usb
[ 0.107549] pps_core: LinuxPPS API ver. 1 registered
[ 0.107578] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.107635] PTP clock support registered
[ 0.109064] clocksource: Switched to clocksource timer
[ 0.134427] NET: Registered protocol family 2
[ 0.135785] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.135858] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.135909] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.136164] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.136224] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.136697] NET: Registered protocol family 1
[ 0.138944] NetWinder Floating Point Emulator V0.97 (double precision)
[ 0.140781] Initialise system trusted keyrings
[ 0.141313] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[ 0.155964] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.156529] jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
[ 0.171007] Key type asymmetric registered
[ 0.171048] Asymmetric key parser 'x509' registered
[ 0.171241] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
[ 0.171271] io scheduler noop registered
[ 0.171289] io scheduler deadline registered
[ 0.172032] io scheduler cfq registered (default)
[ 0.172065] io scheduler mq-deadline registered
[ 0.172083] io scheduler kyber registered
[ 0.173151] sun4i-usb-phy 1c13400.phy: Couldn't request ID GPIO
[ 0.182560] suniv-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[ 0.346331] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[ 0.352870] console [ttyS0] disabled
[ 0.373113] 1c25000.serial: ttyS0 at MMIO 0x1c25000 (irq = 22, base_baud = 6250000) is a 16550A
[ 0.812106] console [ttyS0] enabled
[ 0.838007] 1c25400.serial: ttyS1 at MMIO 0x1c25400 (irq = 23, base_baud = 6250000) is a 16550A
[ 0.847644] suniv-pinctrl 1c20800.pinctrl: unsupported function uart2 on pin PD14
[ 0.876866] 1c25800.serial: ttyS2 at MMIO 0x1c25800 (irq = 24, base_baud = 6250000) is a 16550A
[ 0.887665] SCSI Media Changer driver v0.25
[ 0.895490] m25p80 spi0.0: w25q128 (16384 Kbytes)
[ 0.900384] 5 ofpart partitions found on MTD device spi0.0
[ 0.905869] Creating 5 MTD partitions on "spi0.0":
[ 0.910755] 0x000000000000-0x000000070000 : "u-boot"
[ 0.918127] 0x000000070000-0x000000080000 : "dtb"
[ 0.925286] 0x000000080000-0x000000480000 : "kernel"
[ 0.932753] 0x000000480000-0x000000c00000 : "rootfs"
[ 0.940150] 0x000000c00000-0x000001000000 : "overlayfs"
[ 0.950543] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.957078] ehci-platform: EHCI generic platform driver
[ 0.962667] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.968888] ohci-platform: OHCI generic platform driver
[ 0.974552] usbcore: registered new interface driver usb-storage
[ 0.981714] i2c /dev entries driver
[ 0.988643] NET: Registered protocol family 17
[ 0.993319] Key type dns_resolver registered
[ 0.999615] Loading compiled-in X.509 certificates
[ 1.012417] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regulator
[ 1.024204] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[ 1.030113] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 1
[ 1.038552] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.045440] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.052698] usb usb1: Product: MUSB HDRC host driver
[ 1.057663] usb usb1: Manufacturer: Linux 4.15.0-rc8-licheepi-nano+ musb-hcd
[ 1.064734] usb usb1: SerialNumber: musb-hdrc.1.auto
[ 1.071248] hub 1-0:1.0: USB hub found
[ 1.075168] hub 1-0:1.0: 1 port detected
[ 1.080960] hctosys: unable to open rtc device (rtc0)
[ 1.086483] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 1.103942] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 1.110749] vcc3v3: disabling
[ 1.114526] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 1.123240] cfg80211: failed to load regulatory.db
[ 1.133930] VFS: Mounted root (squashfs filesystem) readonly on device 31:3.
[ 1.145509] devtmpfs: mounted
[ 1.153006] Freeing unused kernel memory: 1024K
[ 1.396362] random: crng init done
modprobe: can't change directory to '/lib/modules': No such file or directory
[ 2.253216] overlayfs: upper fs does not support tmpfile.
[ 2.258645] overlayfs: upper fs does not support xattr.
[ 2.263967] overlayfs: upper fs does not support file handles, falling back to index=off.
Starting syslogd: OK
Starting klogd: OK
Configure the USB Gadget: [ 2.585666] using random self ethernet address
[ 2.590268] using random host ethernet address
/usr/bin/gadget_init: line 41: udevadm: not found
ls: /sys/class/udc/: No such file or directory
FAIL
Starting album: /etc/init.d/S36album: line 9: can't create /sys/class/graphics/fbcon/cursor_blink: nonexistent directory
/etc/init.d/S36album: line 10: can't create /sys/class/vtconsole/vtcon1/bind: nonexistent directory
OK
/etc/init.d/S36album: cd: line 11: can't cd to /overlay/album: No such file or directory
Starting ntpd: /etc/init.d/S39ntpd: line 9: /usr/sbin/ntpd: not found
FAIL
Starting udhcpd: /etc/init.d/S39udhcpd: line 9: /usr/sbin/udhcpd: not found
FAIL
Starting network: ifup: interface lo already configured
ip: can't find device 'usb0'
ip: SIOCGIFFLAGS: No such device
ip: can't find device 'usb0'
random: Cannot open /dev/random: No such file or directory
Successfully initialized wpa_supplicant
Failed to open config file '/overlay/etc/wpa_supplicant.conf', error: No such file or directory
Failed to read or parse configuration '/overlay/etc/wpa_supplicant.conf'.
FAIL
Starting wpa_cli: Failed to connect to non-global ctrl_ifname: (nil) error: No such file or directory
FAIL
Starting sshd: OK
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory
can't open /dev/console: No such file or directory
can't open /dev/ttyGS0: No such file or directory明显的，切换根目录已经成功，因为ssh可以生成key，不会报readonly fs了， 但执行完rcS之后（ssh是rcS中最后一个），就报错误。但如果我不切换跟目录，gadget是OK的，也不会报这个错误。
最近编辑记录 阿黄 (2019-08-29 13:09:47)
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/dev/console 这个设备存在吗？
一直在打印，按Enter也没法到登录那一步，因此也没法看/dev目录。 但如果只是挂载到/overlay，而不执行povit_root的话，就没问题
离线
晕哥 说：/dev/console 这个设备存在吗？
一直在打印，按Enter也没法到登录那一步，因此也没法看/dev目录。 但如果只是挂载到/overlay，而不执行povit_root的话，就没问题
貌似切换后，/dev目录中的各个设备没有自动复制底层的/dev/，因此没有console之类的，也没有ttyS*，查了很多文章，需要把/dev中的加载到新的/dev中
mount -n -t overlay overlayfs:/overlay -o lowerdir=/,upperdir=/overlay/upper,workdir=/overlay/workdir /merged
mount -n /proc -o noatime,--move /merged/proc
pivot_root /merged /merged/rom
mount -n /rom/dev -o noatime,--move /dev
mount -n /rom/tmp -o noatime,--move /tmp
mount -n /rom/sys -o noatime,--move /sys
mount -n /rom/overlay -o noatime,--move /overlay
我再试试看
最近编辑记录 阿黄 (2019-08-29 16:37:29)
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