Unfortunately Pandaboard ES is really expensive in Poland. I asked about close source binary blobs in Odroid C1 on official forum: forum.o droid.c om/viewtopic .php?f=115&t=9147 and got answer: There are binary blobs for the GPU (Mali) and the VPU(video/audio codec). You can boot and use an Odroid-C1 (even with display output / X11) without any binary blobs. The limitations are lack of OpenGL-ES and lack of video/audio codec hardware acceleration.
[Edit] U-Boot is the boot loader (open source, no signing required) Linux Kernel has all open source drivers (on HardKernel GitHub)
