Mount SD Card

1. Install the necessary packages

[Email protected]:/# opkg Install kmod-usb-core kmod-usb-ohci kmod-usb-uhci KMOD-USB2
[Email protected]:/# opkg Install kmod-usb-storage kmod-usb-storage-extras kmod-fs-ext4 kmod-fs-vfat Kmod-nls-utf8 kmod-nls-cp437
[Email protected]:/# opkg Install usbutils fdisk block-mount e2fsprogs blkid

The above KMOD-FS-EXT4 and many other installations appear inconsistent with the kernel, using--force-depends to install

Mkfs.ext4/dev/sda2 after Mount device found the following error, toss half a day software reboot also did not

OpenWrt mount:mounting/dev/sda2 on/mnt failed:invalid argument

DMESG found y many fat:unknown symbol __blockdev_direct_io (err 0)

Suspect this SD card is a lot of bad word, on the phone is sometimes recognized and sometimes do not recognize

Replace a new SD card

When a partition is saved

Re-reading the partition table failed.: Invalid argument

It's because it's written fdisk/dev/sda1 and it's FDISK/DEV/SDA.

Mkfs.ext4/dev/sda2

Mkdir/mnt/extroot

Mount/dev/sda1/mnt/extroot

Tar-c/OVERLAY-CVF-. | Tar-c/MNT/EXTROOT-XF-

umount/mnt/extroot/

[Email protected]:/# blkid
/dev/mtdblock2:type= "SQUASHFS"
/dev/sda2:uuid= "5fb06bd1-12f3-434a-a8b7-12bc89f2f868" type= "Ext4

Block detect >/etc/config/fstab # Block-mount must be installed, or not automatically mount and block detect command No

Vi/etc/config/fstab

[Email protected]:~# cat/etc/config/fstab
Config ' global '
Option Anon_swap ' 0 '
Option Anon_mount ' 0 '
Option Auto_swap ' 1 '
Option Auto_mount ' 1 '
Option Delay_root ' 5 '
Option Check_fs ' 0 '

Config ' swap '
Option Device '/DEV/SDA1 '
Option enabled ' 0 '

Config ' Mount '
Option target '/overlay '
# option UUID ' A6395b9e-1654-4cce-8d65-580b275774d6 '
Option uuid ' 786C2745-2AD0-48B1-9C1C-F436D7F0E2C9 '
Option enabled ' 1 '

/dev/sda2 on/overlay type EXT4 (rw,relatime,data=ordered) after reboot

[Email protected]:~# Mount
Rootfs on/type rootfs (rw)
/dev/root on/rom type SQUASHFS (ro,relatime)
Proc On/proc type proc (rw,noatime)
Sysfs On/sys type SYSFS (rw,noatime)
Tmpfs on/tmp type TMPFS (rw,nosuid,nodev,noatime)
/dev/sda2 on/overlay type EXT4 (rw,relatime,data=ordered)
Overlayfs:/overlay On/type Overlay (rw,noatime,lowerdir=/,upperdir=/overlay/upper,workdir=/overlay/work)
Tmpfs on/dev type TMPFS (rw,relatime,size=512k,mode=755)
Devpts on/dev/pts type devpts (rw,relatime,mode=600)
Debugfs on/sys/kernel/debug type Debugfs (rw,noatime)

[Email protected]:~# DF
Filesystem 1k-blocks used Available use% mounted on
Rootfs 5443728 21992 5122168 0%/
/dev/root 3328 3328 0 100%/rom
TMPFS 30592 30536 0%/tmp
/dev/sda2 5443728 21992 5122168 0%/overlay
Overlayfs:/overlay 5443728 21992 5122168 0%/
Tmpfs 0 0%/dev

View Swap

In order to access the original boot directory, mount it to the/overlay-boot directory, must be created under Extroot Overlay-boot must be installed under Extroot block-mount, otherwise/etc/config/fstab The content in does not execute

Config ' Mount '
Option Target/overlay-boot
Option Device/dev/mtdblock3
Option Fstype JFFS2
Option Options Rw,sync
Option Enable 1
Option Enabled_fsck 0

Resources

Http://wiki.openwrt.org/doc/howto/extroot

Mount SD Card