uart

I have a system running FreeBSD (currently at 12.3, 13.1 upgrade under development) that has a SPI bus, which is working with the FreeBSD spibus driver, to which is connected an ns8250-compatible DUART. There are, in fact, 6 DUARTs on the bus, with chip selects operated by gpio pins. We have...

Hello, I have a motherboard without serial ports and I wonder whether it is possible to get a serial console (server side) on it with a PCIe RS232 card or a USB-to-RS232 adapter. So far I had no luck. I can get a console that works once the system finished booting (once getty process start as...

Once upon a time, PCs needed RS232 serial ports for modems, printers, and terminals. These use-cases are mostly obsolete but now they can be used for factory PLCs, IoT devices, and asset management. RS485 can operate sensor hundreds of feet from the host (master) computer. Many PCs omit...

Using -l com1,/dev/cuau0 parameter with bhyve doesn't seem to work. I'm testing this with MS Windows 10 + PuTTY and getting garbage. Thanks for directions!

How to change the default serial console? I couldn't find any reference. In my case (BeagleBone Black) the boot messages and login prompt go to /dev/ttyu0. With the peripherals I use that port is not accessible, and I'd like to use /dev/ttyu1 instead. I don't care much about boot messages, but I...