D24368.diff
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	Index: head/sys/dev/uart/uart_bus.h
	===================================================================
	--- head/sys/dev/uart/uart_bus.h
	+++ head/sys/dev/uart/uart_bus.h
	@@ -111,6 +111,7 @@
	int sc_rxput;
	int sc_rxget;
	int sc_rxfifosz; /* Size of RX FIFO. */
	+ int sc_rxoverruns;

	/* Transmitter data. */
	uint8_t *sc_txbuf;
	Index: head/sys/dev/uart/uart_core.c
	===================================================================
	--- head/sys/dev/uart/uart_core.c
	+++ head/sys/dev/uart/uart_core.c
	@@ -333,6 +333,7 @@
	sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN;
	uart_sched_softih(sc, SER_INT_RXREADY);
	}
	+ sc->sc_rxoverruns++;
	UART_FLUSH(sc, UART_FLUSH_RECEIVER);
	return (0);
	}
	@@ -740,6 +741,12 @@

	if (sc->sc_sysdev != NULL)
	sc->sc_sysdev->hwmtx = sc->sc_hwmtx;
	+
	+ if (sc->sc_rxfifosz > 1)
	+ SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
	+ SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
	+ "rx_overruns", CTLFLAG_RD, &sc->sc_rxoverruns, 0,
	+ "Receive overruns");

	return (0);