1 Topic by nossiac (edited by nossiac 2013-11-15 06:49:25)

  • Registered: 2013-09-13
  • Posts: 63

Topic: [solved] [ramips 7620a] "mtd" command cannot open /dev/mtd2

This is the flash partition table created for my set.

root@OpenWrt:/# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00030000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00010000 00010000 "factory"
mtd3: 007b0000 00010000 "firmware"
mtd4: 006b3cf9 00010000 "rootfs"
mtd5: 003f0000 00010000 "rootfs_data"

I m trying to modify the data in mtd2.
i have tried :

mtd erase /dev/mtd2

mtd erase /dev/mtdblock2

dd if=/dev/zero of=/dev/mtd2 bs=1 seek=0 count=1024

but all failed.
mtd command complained : Could not open mtd device: /dev/mtd2
dd command complained : dd: can't open '/dev/mtd2': Permission denied

I tried those commands on /dev/mtd5, all of them work properly.
What's wrong with /dev/mtd2?

  • Registered: 2013-09-13
  • Posts: 63

Re: [solved] [ramips 7620a] "mtd" command cannot open /dev/mtd2

solved.

In the target dts file, the partition description of mtd2 include a "read only" tag.
I just deleted it, and it worked fine.

ok, every time I post a thread here for help I will get the solution on my own shortly.
haha. sounds great!