I have installed a PCIe-8431/16 card on a machine that runs RHEL8. Having installed ni-software-2020, including the ni-serial package, I was expecting the number of serial ports that would be available to increase to at least 16. However, I am only seeing four ports.
Having researched this a bit, I ensured that the 8250.nr_uarts=xx parameter gets added during booting of the machine, but I am still unable to see any of the additional ports. I have also ensured that the user is part of the dialout group.
I believe that I am not loading the appropriate kernel module for this card. I have tried loading the ni-serial module, without any luck.
Please find attached the screenshots showing the output from lspci -v and the NIVisaic command.
