UART_STATUS_REG
while ((uartaddr[UART_STATUS_REG/4] & UART_STATUS_TX_EMPTY) == 0) {
while ((uartaddr[UART_STATUS_REG/4] & UART_STATUS_TX_EMPTY) == 0) {
status = bus_space_read_4(bst, bsh, UART_STATUS_REG);
while ((bus_space_read_4(bst, bsh, UART_STATUS_REG) & UART_STATUS_TX_FULL) != 0)
UART_STATUS_REG) & UART_STATUS_TX_FULL) != 0)
UART_STATUS_REG);