Linux router help needed Post: 302996177

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Top Forums UNIX for Beginners Questions & Answers Linux router help needed Post 302996177 by ygemici on Friday 21st of April 2017 02:45:18 AM

04-21-2017

Registered User

Hi , apoklyps3

Your linux is embedded ( for that Your "rootfs" ( "/") is in like RAM drive/disk ( as temp/pivot root ) -> then you cannot remount for r/w and this only r/w only at runtime ). )

( Your firmware in the flash ( mostly ) loaded to the RAM at the boot stages by bootloader ( like u-boot ).. )

Your "/dev/root" device is mounted to (/) point that is "read-only fs" with squashfs ( compressed ) that located in the flash ( or sometimes sdcard ? )
it should contains all binaries , startup files , default config files and the others....

* Your mount command is wrong as already @Corona688 said this.
* And you cannot re-mount the squahfs for r/w ( try with "/dev/root" lets see what happen or not )

Your device ( /dev/mtdblock5 is read/writable block device ( Flash or disk-on-chip ) with "rootfstype=jffs2" and
then you can read the some configs or other related files from it.
But also you can write via "/dev/mtd5" ( safe way ) char device to flash partiton which is writable side.
Shortly , mount command works via block device and must used via the char device for i/o operations..
Your ( /apps ) mount point is writable and has contains user apps/data/configs ( already i said above ) and these are permanent.
Look at the some details..
Managing flash storage with Linux

( the others are Kernel partitions from RAM or other memory chips ( ssd ? ) .. )

* You can look for the details of the flash partitions ( "cat /proc/mtd" )

Now i m not sure is there a easy way ? , ( because i have no knowlodge about the routers and firmware )
But i can say , you have to create the customized firmware and you must flash it to router for permanent solution.. ( if it has not nvram settings for non-squash filesystem support )
( or you must unsquashfs to extract the contents to writable partition then mksquashfs to create new image from thises and write it to the target mtd device ( like "writemtd.c" codes or image dump tools )

Another try , you maybe update the router firmware with ( open-source ) alternatives like dd-wrt , open-wrt .. ( if your product ( Kaon media ) vendor does not the new firmware..)

But best way as @Corona688 said , you must update the new firmware from original Kaon hardware vendor if there is..

Good lucks
regards
ygemici

Last edited by ygemici; 04-21-2017 at 03:58 AM..

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mount_chfs

MOUNT_CHFS(8)						    BSD System Manager's Manual 					     MOUNT_CHFS(8)

NAME

     mount_chfs -- mount a CHFS flash file system

SYNOPSIS

     mount_chfs

DESCRIPTION

     Mounts a flash file system from a flash(4) device.  CHFS file systems can be only mounted from flash devices.  For regular block devices like
     SSD drives or USB drives, please use a regular file system.  The file system will be created during the first mount.  CHFS stands for Chip
     File System.

EXAMPLES

	   mount_chfs /dev/flash0 /mnt

SEE ALSO

     flash(4), fstab(5), mount(8), flash(9)

HISTORY

     CHFS was originally called ChewieFS during development.  The name was changed to avoid legal issues and to have a more neutral name.

AUTHORS

     CHFS was developed at the Department of Software Engineering, University of Szeged, Hungary.

BUGS

     CHFS has a few known bugs as of 2011.  Writing the FS full can cause problems.  Truncating a file and growing it again can cause the new
     bytes not having all zeroes, but filled with the old content instead.

BSD
								 November 29, 2011							       BSD