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Device use embedded Linux version 2.6.26.5, 11 MTD partitions created on "gen_nand" at boot time.

# cat /proc/mtd
dev:    size  erasesize  name
mtd0: 00060000 00004000 "u-boot"
mtd1: 00020000 00004000 "u-bootenv"
mtd2: 013e0000 00004000 "ROMIMAGE"
mtd3: 00700000 00004000 "HALFIMAGE"
mtd4: 01260000 00004000 "LINUX_ROOTFS"
mtd5: 00200000 00004000 "HS_FW"
mtd6: 00100000 00004000 "FPAR"
mtd7: 00080000 00004000 "CISCO"
mtd8: 00020000 00004000 "EEPROM"
mtd9: 00080000 00004000 "NVRAM"
mtd10: 00080000 00004000 "CA_DATA"

BusyBox v1.10.2 (2017-08-02 14:07:25 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

/bin/sh: can't access tty; job control turned off
# mount -t proc proc /proc
# mount -t sysfs sysfs /sys
# mount -t tmpfs tmpfs /tmp
# mount -t tmpfs none /dev
# mkdir /dev/pts
# mount -t devpts none /dev/pts

# mount
rootfs on / type rootfs (rw)
/dev/root on / type squashfs (ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
tmpfs on /tmp type tmpfs (rw)

# cat /proc/filesystems
nodev  sysfs
nodev  rootfs
nodev  bdev
nodev  proc
nodev  debugfs
nodev  sockfs
nodev  pipefs
nodev  anon_inodefs
nodev  tmpfs
nodev  inotifyfs
nodev  configfs
nodev  devpts
        squashfs
nodev  ramfs
nodev  nfs
nodev  jffs2
nodev  mqueue
nodev  rpc_pipefs

Connection with board via serial port, and I'm in limited Busybox shell(ash). Linux root filesystem is squashfs, read-only filesystem on mtd4 (LINUX_ROOTFS). How to mount the root file system, what is correct steps? I know I need a pair mtdx/mtdblockx of device nodes to access flash file system.

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