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 NETBSD

flash

FLASH(9)						   BSD Kernel Developer's Manual						  FLASH(9)

NAME

     flash -- subsystem for flash-like memory devices

SYNOPSIS

     #include <dev/flash/flash.h>

     device_t
     flash_attach_mi(const struct flash_interface *fl, device_t dev);

DESCRIPTION

     Flash-like devices can register themselves to the flash layer with the flash_hw_if structure.  This structure has function pointers and other
     fields.

     The attachment can be done by calling flash_attach_mi() with this structure and the device's device_t as an argument.  Return value is the
     flash layer device.  The flash_interface structure is shown below.

     struct flash_interface {
	     int (*erase) (device_t, struct flash_erase_instruction *);
	     int (*read) (device_t, off_t, size_t, size_t *, uint8_t *);
	     int (*write) (device_t, off_t, size_t, size_t *, const uint8_t *);
	     int (*block_markbad)(device_t, uint64_t);
	     int (*block_isbad)(device_t, uint64_t);
	     int (*sync) (device_t);

	     int (*submit)(device_t, struct buf *);

	     /* storage for partition info */
	     struct flash_partition partition;

	     /* total size of mtd */
	     flash_addr_t size;
	     uint32_t page_size;
	     uint32_t erasesize;
	     uint32_t writesize;
	     uint32_t minor;
	     uint8_t type;
     };

SEE ALSO

     flash(4), nand(9)

AUTHORS

     Adam Hoka <ahoka@NetBSD.org>

BSD
								  March 31, 2011							       BSD