mesa board 7i90HD use J1 conector and 7i84u, bit file.

Hello, can anyone help me? I'm using a Mesa 7i90hd card in epp mode and I want to connect a 7i84u serial card to it, but using the serial port J1 of the 7i90. Can you help me with the bit file? also p2 connector is connected the 7i98 card. Thanks.

There are a couple issues here:

1. 7I90 J1 pinout has swapped TX/RX lines since its intended for use as a sserial remote, not a sserial host
(fixable with cable  wiring changes)

2. More serious: the current hostmot2 driver does not enumerate sserial ports on local I/O pins
and unfortunately the J1 serial interface on the 7I90 is on local IO (LIO) pins so will not be seen.

Easiest solution would be to add a SP491 etc to some GPIO pins