x86: setup: issue a null command after enabling A20 via KBC

[linux-2.6-omap-h63xx.git] / arch / x86 / boot / a20.c

diff --git a/arch/x86/boot/a20.c b/arch/x86/boot/a20.c
index 31348d054fca6129db01e2fd1e6f3600dc3038dd..ef6e142a6b40138c3009795e73ad5da1bcbb0f7f 100644 (file)
--- a/arch/x86/boot/a20.c
+++ b/arch/x86/boot/a20.c
@@ -1,7 +1,7 @@
 /* -*- linux-c -*- ------------------------------------------------------- *
  *
  *   Copyright (C) 1991, 1992 Linus Torvalds
- *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
  *
  *   This file is part of the Linux kernel, and is made available under
  *   the terms of the GNU General Public License version 2.
@@ -9,8 +9,6 @@
  * ----------------------------------------------------------------------- */
 
 /*
- * arch/i386/boot/a20.c
- *
  * Enable A20 gate (return -1 on failure)
  */
 
@@ -97,6 +95,9 @@ static void enable_a20_kbc(void)
 
        outb(0xdf, 0x60);       /* A20 on */
        empty_8042();
+
+       outb(0xff, 0x64);       /* Null command, but UHCI wants it */
+       empty_8042();
 }
 
 static void enable_a20_fast(void)