Date: Tue, 11 May 1999 22:48:22 -0500 (EST) From: Alfred Perlstein <bright@rush.net> To: James Kalmadge <kalmadg@banet.net> Cc: Gurudatt Shenoy <gurudatt@cs.tamu.edu>, freebsd-questions@FreeBSD.ORG Subject: Re: 486 kernel works for 586? Message-ID: <Pine.BSF.3.96.990511224606.26546A-100000@cygnus.rush.net> In-Reply-To: <3738E1C2.E088A614@banet.net>
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On Tue, 11 May 1999, James Kalmadge wrote: > > On Tue, 11 May 1999, Gurudatt Shenoy wrote: > > > > > > > > Hello, > > > I compiled the FreeBSD 2.2.1 kernel on a Pentium class CPU with the CPU > > > type set to "I486_CPU". However, when I boot the machine and try to use > > > this kernel, I get "CPU class unknown" error. > > > Won't a 486 kernel work on a "586" type CPU? > > > > > > I'd appreciate any feedback. Please reply to my email address - I am not > > > on the FreeBSD list. > > > > > > > MUST have the CPU type that you are going to use compiled in, there > > is no "forward/backward compatibility" it just must have that type of > > CPU compiled in. > > To clarify: I guess you are saying that if you compile for multiple > CPU types you're all set. Yes? > As per: > > cpu "I486_CPU" > cpu "I586_CPU" > cpu "I686_CPU" > > in the conf file. Yup, it is important to note that taking out "I386_CPU" is VERY important, it makes a lot of the kernel's lowest routines faster. I'm unsure about I486, but if you can, I'd suggest removing it as well. -Alfred To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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