Are you sure you have the correct 7I43 configuration and pinout for sserial on the 7I34?
What does
sudo mesaflash --device 7I43 --epp --addr 0x378 --program yourbitfile.bit
sudo mesaflash --device 7i43 --epp --addr 0x378 --readhmid
( with the 0x378 address and "yourbitfile.bit" changed to match your setup )
print?
post the printout here by running:
sudo mesaflash --device 7i43 --epp --addr 0x378 --readhmid > mypinout.txt
and posting mypinout.txt here
