D13776.1794679143.diff
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	Index: stand/i386/libi386/comconsole.c
	===================================================================
	--- stand/i386/libi386/comconsole.c
	+++ stand/i386/libi386/comconsole.c
	@@ -267,6 +267,16 @@
	printf("Cannot read bar at 0x%x\n", locator);
	return (CMD_ERROR);
	}
	+
	+ /*
	+ * biospci_read_config() sets port == 0xffffffff if the pcidev
	+ * isn't found on the bus. Check for 0xffffffff and return to not
	+ * panic in BTX.
	+ */
	+ if (port == 0xffffffff) {
	+ printf("Cannot find specified pcidev\n");
	+ return (CMD_ERROR);
	+ }
	if (!PCI_BAR_IO(port)) {
	printf("Memory bar at 0x%x\n", locator);
	return (CMD_ERROR);