The problem was that the WR core did not expose the err and rty lines.
If a device ever used these lines (the crossbar does for example),
then the master would get hung waiting for an answer.

changed WR SFP to SFP2

wr_core: wired clk_aux clock (1 channel), default values for inputs, added tm_link_up_o output and wired aux DAC signals

modules/wr_pps_gen: added external PPS input and resynchronization of internal PPS vs external reference and local clock