bsd.rd's physical memory usage collided with the bootblocks... The

bootblocks have been moved, but we want 4.2 to be upgradeable.  So
reduce the footprint of the bsd.rd by shrinking the ramdisk filesystem
because it is way too large.  tested by sthen and kettenis

src/etc/etc.hppa/disktab

@@ -1,4 +1,4 @@
-#	$OpenBSD: disktab,v 1.5 2003/05/06 09:20:15 mickey Exp $
+#	$OpenBSD: disktab,v 1.6 2008/03/04 23:43:10 deraadt Exp $
 #
 #	@(#)disktab	5.5 (Berkeley) 2/27/91
 #
@@ -24,9 +24,9 @@
 # with the same geometry.
 
 rdroot|ramdiskroot|RAM-disk root FS image:\
-	:ty=simulated:se#512:nc#20:nt#2:ns#128:\
-	:ta=4.2BSD:oa#0:pa#5120:fa#1024:ba#8192:\
-	:ob#0:pb#0:oc#0:pc#5120:
+	:ty=simulated:se#512:nc#18:nt#2:ns#128:\
+	:ta=4.2BSD:oa#0:pa#4608:fa#1024:ba#8192:\
+	:ob#0:pb#0:oc#0:pc#4608:
 
 fakecdrom|Fake image for Bootable CDROM:\
 	:ty=removable:se#512:nt#1:rm#350:ns#640:nc#2048:\