smaller ramdisk image needed for builds

src/etc/etc.zaurus/disktab

@@ -1,4 +1,4 @@
-# $OpenBSD: disktab,v 1.1 2004/12/31 00:06:15 drahn Exp $
+# $OpenBSD: disktab,v 1.2 2005/01/14 04:36:16 deraadt Exp $
 #
 #	@(#)disktab	5.5 (Berkeley) 2/27/91
 #
@@ -24,7 +24,14 @@ rdroot|ramdiskroot|RAM-disk root FS image:\
 	:ta=4.2BSD:oa#0:pa#8192:fa#512:ba#4096:\
 	:ob#0:pb#0:oc#0:pc#8192:
 
-# pseudo-geometry taken from rd7945
+
+rdroot2.5M|ramdiskroot2.5M|RAM-disk root FS image:\
+	:ty=simulated:se#512:nc#16:nt#2:ns#160:\
+	:oa#0:pa#5120:ta=4.2BSD:fa#512:ba#4096:\
+	:ob#0:pb#0:tb=swap:\
+	:oc#0:pc#5120:
+
+# pseudo-geometry taken from rd794
 miniroot:\
 	:ty=winchester:ns#16:nt#7:nc#968:\
 	:pa#10240:ba#8192:fa#1024: