TIMBUART_ISR
while (!(ioread32(port->membase + TIMBUART_ISR) & TXBF) &&
iowrite32(TXFLAGS, port->membase + TIMBUART_ISR);
iowrite32(RXFLAGS, port->membase + TIMBUART_ISR);
isr = ioread32(uart->port.membase + TIMBUART_ISR);
iowrite32(CTS_DELTA, port->membase + TIMBUART_ISR);
iowrite32(0x1ff, port->membase + TIMBUART_ISR);
u32 isr = ioread32(port->membase + TIMBUART_ISR);
iowrite32(TXBF, port->membase + TIMBUART_ISR);
while (ioread32(port->membase + TIMBUART_ISR) & RXDP) {