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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LEARN ABOUT V7

udfs

udfs(7FS)							   File Systems 							 udfs(7FS)

NAME

       udfs - universal disk format file system

DESCRIPTION

       The  udfs  file	system is a file system type that allows user access to files on Universal Disk Format (UDF) disks from within the Solaris
       operating environment. Once mounted,  a udfs file system provides standard Solaris file system operations and semantics. That is, users can
       read  files, write files,  and list files in a directory on a UDF device and applications can use standard UNIX system calls on these files
       and directories.

       Because udfs is a platform-independent file system, the same media can be written to and read from by any operating system or vendor.

   Mounting File Systems
       udfs file systems are mounted using:

       mount-F udfs -o rw/ro device-special

       Use:

       mount /udfs
	if the /udfs and device special file /dev/dsk/c0t6d0s0 are valid and the following line (or similar  line)  appears  in  your  /etc/vfstab
       file:

       /dev/dsk/c0t6d0s0 - /udfs udfs - no ro

       The udfs file system provides read-only support for ROM,  RAM,  and sequentially-recordable media and  read-write  support
	on RAM media.

       The  udfs file system also supports regular files, directories, and symbolic links, as well as device nodes such as block, character, FIFO,
       and Socket.

SEE ALSO

       mount(1M), mount_udfs(1M), vfstab(4)

NOTES

       Invalid characters such as "NULL" and "/" and invalid file names such as "." and ".." will be translated according to the following rule:

       Replace the invalid character with an "_," then append the file name with # followed by a 4 digit hex representation of the 16-bit  CRC	of
       the original FileIdentifier. For example, the file name ".." will become "__#4C05"

SunOS 5.10							    29 Mar 1999 							 udfs(7FS)