diff --git a/sys/arch/sgimips/README.IPn b/sys/arch/sgimips/README.IPn
index c12723de43c3..1ec73394bee1 100644
--- a/sys/arch/sgimips/README.IPn
+++ b/sys/arch/sgimips/README.IPn
@@ -1,4 +1,4 @@
-$NetBSD: README.IPn,v 1.4 2002/05/14 16:21:47 soren Exp $
+$NetBSD: README.IPn,v 1.5 2004/09/29 04:27:41 sekiya Exp $
 
 Arch (kernel)	Models				Codename
 -------------	------				--------
@@ -27,3 +27,15 @@ IP30		Octane				Speedracer
 IP32		O2				Moosehead
 IP33		SN1 (?)
 IP35		SN1 (?)
+
+Architecture	ABI	Bootstrap Load Address	Kernel Load Address
+------------	---	----------------------	-------------------
+IP19 IP21 IP25	32	0x80004000		0x80100000
+IP19 IP21 IP25	64	0xa800000000004000	0xa800000000180000
+IP20 IP22 IP24	32	0x88002000		0x88069000
+IP22 IP24 IP26	64	0xa800000008002000	0xa800000008069000
+IP28		64	0xa800000020003000	0xa800000020080000
+IP30		64	0xa800000020004000	0xa800000020080000
+IP32		32	0x80002000		0x80069000
+IP32		64	0xa800000000002000	0xa800000000078000
+IP33		64	0xa800000000019000	0xa800000000300000