[Buildroot] Writable EXT2 fs on dataflash (using MTD)

Jorge S. jorgesolla at gmail.com
Sun Oct 14 17:24:39 UTC 2007

Hi all,

I've created a rootfs for my AT91RM9200 based custom board and i'm unable to
mount the ext2 fs on a writable way.

I'm using an AT45DB64 spi dataflash as an MTD device and i've defined 3
partitions using this kernel bootargs:

console=/dev/ttyS0,115200 root=/dev/mtdblock2
rootfstype=ext2 mem=32M

After booting the kernel always says:

VFS: Mounted root (ext2 filesystem) readonly.

Even if i try a "mount -o remount,rw /" from the busybox shell, i get this

mount: /dev/root is write-protected, mounting read-only

The "rootfs" partition is defined "writable" at the u-boot code, so i think
i can assume the flash is Unlocked.

Any ideas? Did i miss something when building the Rootfs? any option?

Thanks in advance.
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