UART01x_RSR_OE
if (rsr & UART01x_RSR_OE)
uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag);
port->read_status_mask = UART01x_RSR_OE;
port->ignore_status_mask |= UART01x_RSR_OE;
#define UART01x_RSR_ANY (UART01x_RSR_OE | UART01x_RSR_BE | UART01x_RSR_PE | UART01x_RSR_FE)