Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2)
I built that, using ar71xx option. I have done it before, with openwrt trunk. I didn't have any problem there because it has a RouterStation option in profiles. I think my problem is because of bad building of bin file (using mkfwimage). I also followed openwrt method for building squashfs, lzma and bin file for this profile but it didn't work here. What's that problem that I mentioned because of? (append a "root=" boot option)