Hi All, I’ve an UART ports on Xilinx FPGA board and it gets connected to PC via PCIe bus. I could not find any kernel serial driver which supports our hardware so I plan to develop a new driver. I see two approaches to develop an UART driver i.e. either by using tty_register_driver() or an uart_register_driver(). Regarding my UART module, it has a counter of 16 bits and runs on a 32Mhz clock. It supports all the standard & non-standard baud’s up to 4Mbps. If I used struct tty_operations, I noticed that baud rate changing is done via “.set_termios” API, but this method only supports standard baud rates. I’d like to know why this API does not support non-standard baud rates? Okay, what methods a good driver should implement to support non-standard baud rates? Thanks