mtd2 (rootfs) partition

[phedny]

[admin@WL500g root]$ cat /proc/mtd
dev: size erasesize name
mtd0: 00040000 00010000 "pmon"
mtd1: 003a0000 00010000 "linux"
mtd2: 002f53b4 00010000 "rootfs"
mtd3: 00010000 00002000 "nvram"
mtd4: 00010000 00010000 "config"

mtd0 (pmon) -> bootloader
mtd1 (linux) -> firmware
mtd3 (nvram) -> nvram variables
mtd4 (config) -> flashfs

Only mtd2 (rootfs) I can't seem to find out what it's used for. Also, why does it have this "strange" size? If it isn't being used by current firmware, is it safe to use it?

[Oleg]

It's used by firmware. Namely root filesystem (squashfs). Needs to be there to be mounted.

[phedny]

It's used by firmware. Namely root filesystem (squashfs). Needs to be there to be mounted.
I was studying the firmware upload code (working on Download-and-Upgrade button for webadmin for quick updating) and that seemed to only write to the 'linux' partition.

#define sys_upgrade(image) eval("write", image, "/dev/mtd/1")

Is mtd2 starting at an offset from mtd1 equal to the difference in size of those partitions?

That is, is mtd2 laying within mtd1?

[Oleg]

yes, mtd2 size and position detemined automatically during boot.
and it's entirely inside the mtd1.