I have a RouterBoard 433ah and I installed OpenWRT (last trunk) on it.
I then recompile the linux kernel to OpenWrt and then copied to the boot partition (/dev/mtdblock1 or "kernel"). But before this, I forgot to erase from the boot partition the old kernel. On the "kernel" partition is not enough space - "said" VFS.
I reboot and I had to format NAND flash from the bootloader (RouterBoot). When I downloaded the kernel by tftp again, on the "kernel" partition is not enough space even for linux kernel:

root@OpenWrt:/# df -h
Filesystem           1K-blocks      Used Available Use% Mounted on
tmpfs                    63664              40     63624       0%      /tmp
tmpfs                    512                  0       512           0%      /dev
/dev/mtdblock1   3840                 2304      1536    60%    /mnt

Now I can not copy the kernel to that partition and install OpenWrt
How do I clean up this partition?

I have the same situation, but I didn't forgot to erase anything

root@OpenWrt:/# df -h
Filesystem                Size      Used Available Use% Mounted on
tmpfs                    62.1M     40.0K     62.1M   0% /tmp
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/mtdblock1            3.8M      2.3M      1.5M  60% /mnt

and here is the content:

root@OpenWrt:/# ls -la /mnt/
drw-rw-rw-    1 root     root         2048 Jan  1 00:12 .
drwxr-xr-x   17 root     root            0 Jan  1 00:00 ..
drw-rw-rw-    1 root     root         2048 Jan  1 00:12 lost+found

Thank you.

Regards
dblackberr

It seems that is control information of partition. And the solution maybe a smaller kernel image or put it on rootfs partition and change it in the boot loader.
Somebody can tell if it is possible to do?

Regards
dblackbeer