D29130.diff
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	diff --git a/sys/dev/uart/uart_dev_ns8250.c b/sys/dev/uart/uart_dev_ns8250.c
	--- a/sys/dev/uart/uart_dev_ns8250.c
	+++ b/sys/dev/uart/uart_dev_ns8250.c
	@@ -738,6 +738,7 @@
	} else {
	if (iir & IIR_TXRDY) {
	ipend \|= SER_INT_TXIDLE;
	+ ns8250->ier &= ~IER_ETXRDY;
	uart_setreg(bas, REG_IER, ns8250->ier);
	uart_barrier(bas);
	} else
	@@ -1035,7 +1036,9 @@
	uart_setreg(bas, REG_DATA, sc->sc_txbuf[i]);
	uart_barrier(bas);
	}
	- uart_setreg(bas, REG_IER, ns8250->ier \| IER_ETXRDY);
	+ if (!broken_txfifo)
	+ ns8250->ier \|= IER_ETXRDY;
	+ uart_setreg(bas, REG_IER, ns8250->ier);
	uart_barrier(bas);
	if (broken_txfifo)
	ns8250_drain(bas, UART_DRAIN_TRANSMITTER);