UART011_DR_OE
port->read_status_mask = UART011_DR_OE | 255;
port->ignore_status_mask |= UART011_DR_OE;
if (ch & UART011_DR_OE)
uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag);
#define UART_DR_ERROR (UART011_DR_OE | UART011_DR_BE | UART011_DR_PE | UART011_DR_FE)