Date: Sat, 26 Apr 1997 00:50:02 -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: <199704260750.AAA10878@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: bde@zeta.org.au, yensid@imsa.edu Cc: FreeBSD-gnats-submit@FreeBSD.org Subject: Re: kern/3391: Pentium optimizations in default bootdisk breaks some 486's Date: Sat, 26 Apr 1997 17:40:35 +1000 >>> On all current boot disks, on certain 486's (mine, at least) >>... >>This can't have anything to do with i586 optimizations. There are no i586 > >Actually, I think there was a version mix-up; I filed the problem report >from a system running 2.1.7, I'm having this problem with 2.2 and later. >Sorry 'bout that Also a CPU mixup? :-) i586 optimizations are not used on 486's. >When I posed this problem to the general problems list, I received responses >indicating that this was a problem with the 586 optimizations, and the >source seems to agree: > >freebsd-src/sys/i386/isa/npx.c >[...] This decides whether the i586 copying optimizations are used. They are only used on i586's, and then only if they aren't disabled. There is no need to recompile without I586_CPU to control them. So if recompiling without i586_CPU makes a difference, then the problem must have nothing to do with known problems with i586 optimizations :-). Bruce
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