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From: "Andrey V. Elsukov" <ae@FreeBSD.org>
Date: Wed, 16 Mar 2011 20:04:56 +0000 (UTC)
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Subject: svn commit: r219702 - head/sys/boot/i386/common
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Author: ae
Date: Wed Mar 16 20:04:56 2011
New Revision: 219702
URL: http://svn.freebsd.org/changeset/base/219702

Log:
  Set control flags in putc(). This should fix zfsboot hangs in drvread().
  
  PR:		kern/153552
  Reviewed by:	jhb
  MFC after:	1 week

Modified:
  head/sys/boot/i386/common/cons.c

Modified: head/sys/boot/i386/common/cons.c
==============================================================================
--- head/sys/boot/i386/common/cons.c	Wed Mar 16 17:09:51 2011	(r219701)
+++ head/sys/boot/i386/common/cons.c	Wed Mar 16 20:04:56 2011	(r219702)
@@ -37,6 +37,7 @@ void
 putc(int c)
 {
 
+	v86.ctl = V86_FLAGS;
 	v86.addr = 0x10;
 	v86.eax = 0xe00 | (c & 0xff);
 	v86.ebx = 0x7;