Date: Sat, 26 Apr 1997 00:00:02 -0700 (PDT) From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs Subject: Re: kern/3391: Pentium optimizations in default bootdisk breaks some 486's Message-ID: <199704260700.AAA09353@hub.freebsd.org>
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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
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