Userspace physical memory allocating, reading and writing (from separate process) for embedded Linux working with DMA-operated regions up to one memory page (4096 bytes). You have to set up cross-build environment as described in http://www.yoctoproject.org/docs/1.6.1/adt-manual/adt-manual.html sections 3.1.3 and 3.2 to rebuild binary C lib Python2, python-mmap and python-ctypes are required on target hardware.