[Discuss-gnuradio] USRP2 firmware build

[Jeff Long]

Trying out the firmware build ...

- had to comment out apps/rx_only_v2.c, line 104
  (static volatile bool link_is_up = false) to avoid
  multiple definitions ... does not appear to be used
  in this file and is declared static

- build exceeds size of flatmem (0x8000) ... bumped to
  0xa000 and it worked, but I don't know what flatmem is
  at this point, so that's probably wrong

- not sure why, but the EDK101_GPL_GNU gcc didn't build
  right on a Fedora 9 machine ... worked fine on Fedora 8
  ... will try again

Also, should USRP2/RFX be working at this point?  Noticed
select_rx_antenna is unimplemented (get more signal using
RX2 than TX/RX but signal is really low), and rfx_set_gain_rx
doesn't seem to have any effect.