Index: head/stand/i386/libi386/comconsole.c
===================================================================
--- head/stand/i386/libi386/comconsole.c
+++ head/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);