D47078.diff
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	diff --git a/sys/dev/uart/uart_subr.c b/sys/dev/uart/uart_subr.c
	--- a/sys/dev/uart/uart_subr.c
	+++ b/sys/dev/uart/uart_subr.c
	@@ -200,13 +200,6 @@
	bus_addr_t addr = ~0U;
	int error;

	- /*
	- * All uart_class references are weak. Make sure the default
	- * device class has been compiled-in.
	- */
	- if (class == NULL)
	- return (ENXIO);
	-
	/*
	* Check the environment variables "hw.uart.console" and
	* "hw.uart.dbgport". These variables, when present, specify
	@@ -300,6 +293,13 @@
	goto inval;
	freeenv(cp);

	+ /*
	+ * The default uart_class reference is weak. Make sure the default
	+ * device class has been compiled-in or we've set one with dt=.
	+ */
	+ if (class == NULL)
	+ return (ENXIO);
	+
	/*
	* Accept only the well-known baudrates. Any invalid baudrate
	* is silently replaced with a 0-valued baudrate. The 0 baudrate