ubifs文件系统添加squashfs文件系统，实现文件系统只读，overlay可写的这种方式

1、内核启用功能

Device Drivers ->
   Memory Technology Device (MTD) Support ->
      Enable UBI - Unsorted block images ->
         Read-only block devices on top of UBI volume

 

CONFIG_SQUASHFS=y
CONFIG_SQUASHFS_LZO=y
CONFIG_MTD=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_UBI=y
CONFIG_UBIFS_FS=y

 

2、创建 SquashFS

mksquashfs rootfs rootfs.squashfs -nopad -noappend -root-owned -b 256k -comp xz -processors 2

 

3、将rootfs.squashfs + overlay 打包成ubifs镜像文件

   ubinize -o p2002ac-loongson32-ls1b-squashfs-rootfsdata.ubifsze -m 2048 -p 128KiB -s 2048 ubinize-squashfs.cfg

  文件ubinize-squashfs.cfg如下:

[ubi]
# Volume mode (other option is static)
mode=ubi
# Source image
#image=p2002ac-loongson32-ls1b-squashfs.ubifs
image=p2002ac-loongson32-ls1b-root.squashfs
# Volume ID in UBI image
vol_id=0
# Allow for dynamic resize
vol_type=dynamic
# Volume name
vol_name=rootfs
# Autoresize volume at first mount
vol_flags=autoresize
[data]
mode=ubi
vol_id=1
vol_type=dynamic
vol_name=rootfs_data
vol_size=8MiB

 

4、进行分区的擦除与创建块设备

ubidetach -p /dev/mtd2
ubiformat /dev/mtd2
ubiattach /dev/ubi_ctrl -m 2
ubimkvol /dev/ubi2 -N ubifs -m
ubiblock -c /dev/ubi2_0

创建成功会在/dev下有ubiblock2_0   

 

5、分区写入与挂载

flash_eraseall /dev/mtd2;nandwrite -p /dev/mtd2 /mnt/huangzhigang/p2002ac-loongson32-ls1b-squashfs-rootfsdata.ubifsze

mount -t squashfs -o ro /dev/ubiblock2_0 /mnt
挂载成功后会/mnt目录下有文件系统的完整目录，说明系统能正常识别和操作

6、将分区作为开机的启动分区
在uboot终端命令写入:

setenv bootargs 'console=ttyS1,115200 root=/dev/ubiblock2_0 ubi.mtd=1,2048  mtdparts=ls1x-nand:8M(kernel),214M(ubi),32M(web),2M(factory);spi-flash:496k(uboot),16k(env) rootfstype=squashfs  rootflags=sync video=ls1xfb:800x480-16@60 product_id=2'

boot

实现作为分区启动，
系统日志输出, 成功创建启动

[    3.333705] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    3.341459] ehci-platform: EHCI generic platform driver
[    3.348409] ehci-platform ehci-platform: EHCI Host Controller
[    3.357008] ehci-platform ehci-platform: new USB bus registered, assigned bus number 1
[    3.367336] ehci-platform ehci-platform: irq 40, io mem 0x1fe00000
[    3.386996] ehci-platform ehci-platform: USB 2.0 started, EHCI 1.00
[    3.396014] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    3.403280] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    3.410958] usb usb1: Product: EHCI Host Controller
[    3.416263] usb usb1: Manufacturer: Linux 4.14.206 ehci_hcd
[    3.422276] usb usb1: SerialNumber: ehci-platform
[    3.432978] hub 1-0:1.0: USB hub found
[    3.438605] hub 1-0:1.0: 1 port detected
[    3.453735] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    3.461159] ohci-platform: OHCI generic platform driver
[    3.467557] ohci-platform ohci-platform: Generic Platform OHCI controller
[    3.477519] ohci-platform ohci-platform: new USB bus registered, assigned bus number 2
[    3.487408] ohci-platform ohci-platform: irq 41, io mem 0x1fe08000
[    3.557981] usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
[    3.565269] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    3.572955] usb usb2: Product: Generic Platform OHCI controller
[    3.579321] usb usb2: Manufacturer: Linux 4.14.206 ohci_hcd
[    3.585329] usb usb2: SerialNumber: ohci-platform
[    3.596366] hub 2-0:1.0: USB hub found
[    3.601989] hub 2-0:1.0: 1 port detected
[    3.618579] usbcore: registered new interface driver usb-storage
[    3.644354] rtc-sd2068 0-0032: rtc core: registered sd2068 as rtc0
[    3.653414] i2c /dev entries driver
[    3.668185] ls1x-wdt ls1x-wdt: Loongson1 Watchdog driver registered
[    3.679914] NET: Registered protocol family 17
[    3.687527] can: controller area network core (rev 20170425 abi 9)
[    3.695868] NET: Registered protocol family 29
[    3.720809] ubi0: attaching mtd1
[    4.785354] ubi0: scanning is finished
[    4.843524] ubi0: volume 0 ("rootfs") re-sized from 118 to 1601 LEBs
[    4.859173] ubi0: attached mtd1 (name "ubi", size 214 MiB)
[    4.865328] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[    4.873380] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[    4.880853] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
[    4.888466] ubi0: good PEBs: 1712, bad PEBs: 0, corrupted PEBs: 0
[    4.895000] ubi0: user volume: 2, internal volumes: 1, max. volumes count: 128
[    4.902682] ubi0: max/mean erase counter: 1/0, WL threshold: 4096, image sequence number: 1921414063
[    4.912499] ubi0: available PEBs: 0, total reserved PEBs: 1712, PEBs reserved for bad PEB handling: 40
[    4.922353] ubi0: background thread "ubi_bgt0d" started, PID 600
[    4.941144] block ubiblock0_0: created from ubi0:0(rootfs)
[    4.955220] ubiblock: device ubiblock0_0 (rootfs) set to be root filesystem
[    4.973244] rtc-sd2068 0-0032: setting system clock to 2000-01-15 00:31:21 UTC (947896281)
[    4.997119] UBIFS: parse sync
[    5.039594] VFS: Mounted root (squashfs filesystem) readonly on device 254:0.
[    5.056147] Freeing unused kernel memory: 192K
[    5.066924] This architecture does not have kernel memory protection.
[    7.975971] init: Console is alive
[    7.988402] init: - watchdog -
[    8.837389] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    9.039662] softdog: initialized. soft_noboot=0 soft_margin=60 sec soft_panic=0 (nowayout=0)
[    9.127253] sdhci: Secure Digital Host Controller Interface driver
[    9.143162] sdhci: Copyright(c) Pierre Ossman
[    9.163311] sdhci-pltfm: SDHCI platform and OF driver helper
[    9.198641] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    9.223629] init: - preinit -
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[   12.968734] random: procd: uninitialized urandom read (4 bytes read)
[   12.986153] UBIFS (ubi0:1): default file-system created
[   12.999293] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 641
[   13.127697] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "rootfs_data"
[   13.136013] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[   13.146425] UBIFS (ubi0:1): FS size: 7237632 bytes (6 MiB, 57 LEBs), journal size 1015809 bytes (0 MiB, 6 LEBs)
[   13.156999] UBIFS (ubi0:1): reserved for root: 341850 bytes (333 KiB)
[   13.163901] UBIFS (ubi0:1): media format: w4/r0 (latest is w5/r0), UUID 68723DFE-84EF-4E8C-88BE-0E803CBE5E80, small LPT model
[   13.183544] mount_root: overlay filesystem has not been fully initialized yet
[   13.203230] mount_root: switching to ubifs overlay
[   13.271372] urandom-seed: Seed file not found (/etc/urandom.seed)
[   13.712859] procd: - early -
[   13.716792] procd: - watchdog -
[   15.621926] procd: - watchdog -
[   15.629340] procd: - ubus -
[   16.096778] random: ubusd: uninitialized urandom read (4 bytes read)
[   16.557844] random: jshn: uninitialized urandom read (4 bytes read)
[   16.587610] random: ubusd: uninitialized urandom read (4 bytes read)
[   16.620396] procd: - init -
[   18.892882] kmodloader: loading kernel modules from /etc/modules.d/*
[   19.079389] kmodloader: done loading kernel modules from /etc/modules.d/*
[   19.943121] random: crng init done
[   19.946683] random: 6 urandom warning(s) missed due to ratelimiting
[   40.971030] stmmaceth stmmaceth.0 eth0: PTP not supported by HW

 

参考链接:

https://www.cxybb.com/article/qq_15031263/94476655#patch_18  新唐ARM9 NU980 移植OpenWrt LEDE_传琦5858的博客-程序员宝宝
http://souktha.github.io/misc/squashfs-ubi/   UBI block and read-only NAND FS
https://www.cxybb.com/article/MengXP/108810071 squashfs重打包和ubi重打包_MengXP的博客-程序员宝宝_squashfs打包

https://unix.stackexchange.com/questions/455043/using-squashfs-on-top-of-ubi-as-root-file-system Using squashfs on top of ubi as root file system