From owner-freebsd-bugs  Sat Apr 26 00:00:06 1997
Return-Path: <owner-bugs>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id AAA09365
          for bugs-outgoing; Sat, 26 Apr 1997 00:00:06 -0700 (PDT)
Received: (from gnats@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id AAA09353;
          Sat, 26 Apr 1997 00:00:02 -0700 (PDT)
Date: Sat, 26 Apr 1997 00:00:02 -0700 (PDT)
Message-Id: <199704260700.AAA09353@hub.freebsd.org>
To: freebsd-bugs
Cc: 
From: Bruce Evans <bde@zeta.org.au>
Subject: Re: kern/3391: Pentium optimizations in default bootdisk breaks some 486's
Reply-To: Bruce Evans <bde@zeta.org.au>
Sender: owner-bugs@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

The following reply was made to PR kern/3391; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: FreeBSD-gnats-submit@FreeBSD.org, yensid@imsa.edu
Cc:  Subject: Re: kern/3391: Pentium optimizations in default bootdisk breaks some 486's
Date: Sat, 26 Apr 1997 16:49:45 +1000

 >>Release:        FreeBSD 2.1.7-RELEASE i386
 >>Environment:
 >	i486 w/AMD BIOS, 28M ram, Diamond Speedstar Pro (Cirrus GD5230 based)
 >	vesa video board
 >
 >>Description:
 >	On all current boot disks, on certain 486's (mine, at least)
 >after the kernel is loaded, the screen characters turn into unreadable
 >gibberish in simply horrid shades of magenta and orange, leaving the
 >machine in a unusable state.  
 
 This can't have anything to do with i586 optimizations.  There are no i586
 significant optimizations in 2.1.7.  There is one (insignificant) i586
 optimization -  not using the i486-optimized bzero,  There is one
 (insignificant) i586 pessimization - zeroing the TimeStampCounter every
 clock tick and never using things that depend on this.  The i586
 mizations are only used on i586's.
 
 Bruce