I have a serial port PCI card in my CPU. The chip is CH352_2S. The chip maker offers source code only for linux.
This source code appears part of 8250_pci driver. But this driver is not available among manjaro kernel drivers.
OK… I am not getting the card to work. Rather, it worked one time, then no more.
The boot messages contain no message or reference for the two serial ports. But the Terminal program (through wine) thinks there are COM2 and COM4. But receives nothing. And hangs.
Looks like there is a driver issue. How can I rule out driver issue ?
Or maybe you have no rights to access the serial port, since it needs root? Then you have to adjust the permissions for the device, so that you can access it as user.
In boot messages, there is no mention of /dev/ttyS1 or /dev/ttyS2.
The legacy programs which use serial ports are all Windows programs. So, I use Bray’s Terminal to trouble-shoot. May be I can use cutecom, a native app to trouble shoot as Trimoon suggests.
No permission issues. My user id part of uucp,wheel groups.
Maybe card is malfunctioning. I can find out only tomorrow.