- Allocate the 'PCIC' interrupt from the last available (higher #) IRQ

instead of the first available, like Win95 does.  This appears to help
  on some machines, and avoids potential problems with built-in serial
  ports which tend to live at IRQ 3, which is usually picked with the
  old method.

sys/pccard/pccard.c

@@ -451,7 +451,7 @@ pccard_alloc_intr(u_int imask, inthand2_t *hand, int unit,
 	int irq;
 	unsigned int mask;
 
-	for (irq = 1; irq < ICU_LEN; irq++) {
+	for (irq = ICU_LEN; irq > 0; irq--) {
 		mask = 1ul << irq;
 		if (!(mask & imask))
 			continue;