Override the default timer frequency. Turns out the NSLU2's timers are

clocked at exactly 66.0MHz.

sys/arch/evbarm/conf/NSLU2

@@ -1,4 +1,4 @@
-#	$NetBSD: NSLU2,v 1.1 2006/02/28 20:40:33 scw Exp $
+#	$NetBSD: NSLU2,v 1.2 2006/03/04 11:27:12 scw Exp $
 #
 #	Linksys NSLU2 "Slug" NAS Device
 #
@@ -31,6 +31,7 @@ options 	XSCALE_CACHE_READ_WRITE_ALLOCATE
 
 # Board Type
 makeoptions	BOARDTYPE="nslu2"
+options 	IXP425_CLOCK_FREQ=66000000
 
 # File systems