From 8fd527934388a05f528dd941bc6b5b363a1b3163 Mon Sep 17 00:00:00 2001
From: Michael Mueller <malware@t-online.de>
Date: Sun, 4 May 2008 20:48:53 +0200
Subject: [PATCH] Unify access to I/O and memory of the microchannel bus.
 Spares one segment register.

---
 arch/power/kernel/head.S | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/arch/power/kernel/head.S b/arch/power/kernel/head.S
index ef33e123ddd..f915200894e 100644
--- a/arch/power/kernel/head.S
+++ b/arch/power/kernel/head.S
@@ -722,24 +722,17 @@ start_here:
 	//
 	lis	r0,0x8000
 	mtsr	15,r0
-#if 0
 	//
-	// First MCA bus (I/O)
+	// We can address the first MCA bus by
+	// the following segment values:
+	//  820C0000   I/O only
+	//  820C0020   Memory 
+	//  820C0030   both
 	//
 	lis	r0,0x820C
-	mtsr	14,r0
-	//
-	// First MCA bus (Memory)
-	//
-	ori	r0,r0,0x20	// Memory on first MCA bus
-	mtsr	13,r0
-	//
-#else
-	lis	r0,0x820C
 	ori	r0,r0,0x30
-	mtsr	13,r0
 	mtsr	14,r0
-#endif
+	//
 	// IOCC of first MCA bus
 	//
 	lis	0,0x820C
-- 
2.11.4.GIT