What is strange is that the owner of at http://rglinuxtech.com/ says he compiled 3.15rc? for the Dreamplug and that it runs nicely. But he's using Fedora. So I wonder whether the toolchain on Archlinuxarm might be broken for Dreamplug.
Another hint in that direction is the fact that my own-compiled (on a mid-june updated Dreamplug) 3.13.7 doesn't work, whereas the archlinuxarm 3.13.7 works fine (well, that could also be me, but still - it is the same problem where the USB-devices (harddisk and MMC) are not recognized for the 'root=')...
Is there an easy way to go back into base-devel, like there is for the kernels?