2.4.26 doesn't boot on a 386 without "Unsynced TSC support"
From: Erik Mouw (erik_at_harddisk-recovery.com)
Date: 07/28/04
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Date: Wed, 28 Jul 2004 17:47:49 +0200 To: linux-kernel@vger.kernel.org
Hi,
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!
The error message comes from the function check_config() in
include/asm-i386/bugs.h (thanks to wli for figuring out faster than I
did).
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).
The help for CONFIG_X86_TSC_DISABLE mentions to use it for "NUMA
mult-mode boxes, laptops and other systems suffering from unsynced TSCs
or TSC drift, which can cause gettimeofday to return non-monotonic
values." A simple 80386 board doesn't belong to these, and I can't
remember having problmes with gettimeofday() in the past (IIRC the
board last ran linux-1.2 or 2.0).
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.
Erik
-- +-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 -- | Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands - 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/
- Previous message: David S. Miller: "Re: PATCH: fix some 32bit isms"
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