Hello, We're using nanopi neo plus2 for some projects. Many of them need to communicate via RS-485. Nanopi neo2 and neo plus2 has both 2 8250 UART (with TX-RX-RTS-CTS). We tried to set SER_RS485_ENABLED to make ttyS1 to work as rs-485 but we've got "Inappropriate ioctl for device" when run...