From 567c62b04012a4709806b0736d96eccb401d5c4a Mon Sep 17 00:00:00 2001
From: bde <bde@FreeBSD.org>
Date: Sun, 13 Aug 1995 07:49:35 +0000
Subject: Disable fifos in sioclose().  Closes PR 576.

---
 sys/dev/sio/sio.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'sys/dev/sio/sio.c')

diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index 098ca51..205fa5b 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
- *	$Id: sio.c,v 1.108 1995/07/31 18:29:51 bde Exp $
+ *	$Id: sio.c,v 1.109 1995/07/31 21:10:36 bde Exp $
  */
 
 #include "sio.h"
@@ -986,6 +986,14 @@ comhardclose(com)
 			}
 		}
 	}
+	if (com->hasfifo) {
+		/*
+		 * Disable fifos so that they are off after controlled
+		 * reboots.  Some BIOSes fail to detect 16550s when the
+		 * fifos are enabled.
+		 */
+		outb(iobase + com_fifo, 0);
+	}
 	com->active_out = FALSE;
 	wakeup(&com->active_out);
 	wakeup(TSA_CARR_ON(tp));	/* restart any wopeners */
-- 
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