>> How can I tell what CPU the kernel was compiled for?
>
> I believe 'uname -m' will indicate what CPU the currently running kernel
>was compiled for.
I think the uname app just invokes the uname syscall whose
contract is not necessarily to report the target build but
the current (and perhaps too general) architecture type.
If you have a config file handy for the kernel in
question this (somewhat clunky) approach will provide
the authoritative answer:
for tag in CONFIG_M386 CONFIG_M486 CONFIG_M586 \
CONFIG_M586MMX CONFIG_M586TSC CONFIG_M686 \
CONFIG_MCRUSOE CONFIG_MCYRIXIII CONFIG_MELAN \
CONFIG_MK6 CONFIG_MK7 CONFIG_MPENTIUM4 \
CONFIG_MPENTIUMIII CONFIG_MWINCHIP2 \
CONFIG_MWINCHIP3D CONFIG_MWINCHIPC6
do
fgrep $tag yourConfigFile
done
...after which you can interpret the results using this
table of (largely obvious) mappings:
CONFIG_M386 386
CONFIG_M486 486
CONFIG_M586 586/K5/5x86/6x86/6x86MX
CONFIG_M586MMX Pentium-MMX
CONFIG_M586TSC Pentium-Classic
CONFIG_M686 Pentium-Pro/Celeron/Pentium-II
CONFIG_MCRUSOE Crusoe
CONFIG_MCYRIXIII CyrixIII/C3
CONFIG_MELAN Elan
CONFIG_MK6 K6/K6-II/K6-III
CONFIG_MK7 Athlon/Duron/K7
CONFIG_MPENTIUM4 Pentium-4
CONFIG_MPENTIUMIII Pentium-III/Celeron(Coppermine)
CONFIG_MWINCHIP2 Winchip-2
CONFIG_MWINCHIP3D Winchip-2A/Winchip-3
CONFIG_MWINCHIPC6 Winchip-C6
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