Date: 22 Mar 1996 19:37:42 GMT From: graichen@omega.physik.fu-berlin.de (Thomas Graichen) To: questions@FreeBSD.org Subject: Re: New CPU, old /kernel won't boot Message-ID: <4iuvi6$106@mordillo.physik.fu-berlin.de> References: <2.2.32.19960321221247.006bc3cc@zoom.com>
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Mike R. Shuyler (mshuyler@zoom.com) wrote:
: I WAS running 2.1.0 on my 486DX2/50 just fine without any problems until I
: replaced my cpu with an Intel Pentium Overdrive CPU 83Mhz that was *given*
: to me.
: Now when I try to boot the system I get a PANIC unknown cpu type or
: similar message. I had built a custom kernel for the machine, and the cpu
: type was set for i486 in the kernel config, so I understand why I can't
: start the system.
it would eventually an idea to do something like NetBSD - if they find a
unsupported CPU-type they "fall back" to a lower one - i once took a disk from
an i386 machine to an i486 one and and so it worked fine - it said something
like ... - ok now i've put the NetBSD cd in - here's their code from
/sys/arch/i386/i386/machdep.c:
...
#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU)
#error No CPU classes configured.
#endif
#ifndef I586_CPU
case CPUCLASS_586:
#ifdef I486_CPU
printf("NOTICE: lowering CPU class to i486\n");
cpu_class = CPUCLASS_486;
break;
#endif
#endif
#ifndef I486_CPU
case CPUCLASS_486:
#ifdef I386_CPU
printf("NOTICE: lowering CPU class to i386\n");
cpu_class = CPUCLASS_386;
break;
#endif
#endif
#ifndef I386_CPU
case CPUCLASS_386:
panic("CPU class not configured");
#endif
default:
break;
...
why shouldn't we do simply the same - any points against it ?
t
--
thomas graichen graichen@mail.physik.fu-berlin.de graichen@FreeBSD.org
perfection is reached, not when there is no longer anything to add, but when
there is no longer anything to take away antoine de saint-exupery
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