DataFlash.
- Add a mapping for the Nut/OS configuration DataFlash partition according
to the board manual (but not known to either Linux or U-Boot (patches).
all integrated and on-board peripherals except the DataFlash (at91_spi(4)
and at45d(4) still need to be unb0rken) and NAND Flash (missing NAND
framework) are working.
AFAICT, this makes FreeBSD the first operating system besides Nut/OS
supporting Ethernut 5 out of tree.