Messages in this thread | | | Date | Wed, 28 Jul 2004 21:08:38 +0200 (MEST) | From | Mikael Pettersson <> | Subject | Re: 2.4.26 doesn't boot on a 386 without "Unsynced TSC support" |
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On Wed, 28 Jul 2004 17:47:49 +0200, Erik Mouw wrote: >I tried to boot 2.4.26 on my good old 386 board, but got a kernel >panic: > > CPU: 386 > Kernel panic: Kernel compiled for Pentium+, requires TSC feature! ... >I am sure I selected support for a 80386 CPU, so the error message >looks wrong to me. CONFIG_M586TSC is not set, but CONFIG_X86_TSC is >enabled by default. The only way to disable it, is to enable "Unsynced >TSC support", (CONFIG_X86_TSC_DISABLE). ... >My question is: is this a code bug, or a documentation bug? Right now, >I guess 2.4.26 will not run on anything < Pentium without >CONFIG_X86_TSC_DISABLE enabled.
It's a limitation in scripts/Configure. If you start with a .config with TSC enabled/required, and just flip the CPU selection option to a TSC-less CPU, like 386 or 486, then you end up with a .config that _still_ has TSC enabled/required.
The workaround is to run 'make oldconfig' afterwards.
FWIW, both 2.4 and 2.6 kernels run Ok on my 486. (My 486's Fedora user-space is another matter, requiring kernel hacks for unconditional RDTSC usage in RPM, but that's another issue.) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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