Date: Sat, 26 Apr 1997 16:20:01 -0700 (PDT) From: Don Schmidt <yensid@coke.imsa.edu> To: freebsd-bugs Subject: Re: kern/3391: Pentium optimizations in default bootdisk breaks some 486's Message-ID: <199704262320.QAA16072@hub.freebsd.org>
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The following reply was made to PR kern/3391; it has been noted by GNATS.
From: Don Schmidt <yensid@coke.imsa.edu>
To: Bruce Evans <bde@zeta.org.au>
Cc: yensid@imsa.edu, FreeBSD-gnats-submit@FreeBSD.org,
yensid@postoffice.imsa.edu
Subject: Re: kern/3391: Pentium optimizations in default bootdisk breaks some 486's
Date: Sat, 26 Apr 1997 18:12:54 -0500
In message <199704260740.RAA30350@godzilla.zeta.org.au>, Bruce Evans writes:
>>>> 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
>Also a CPU mixup? :-) i586 optimizations are not used on 486's.
>
>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 :-).
Again, when I first asked for help, It was indicated to me that
"586 optimizations caused problems on some 486's" and that I could fix the
problem by passing the flag 0x1 to the npx driver, which appears to disable
the bzero optimizations. I can't do that, though, because my screen gets
mucked up before I can get to the configuration screen.
Assuming that this isn't the problem, though, would you have any
suggestions as to what is wrong? I just want to be able to boot! :)
Thanks!
===============================================================================
Don Schmidt Network Systems Administrator
yensid@imsa.edu Illinois Math and Science Academy
----------You can build a Mainframe from the things you find at home!----------
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