Fix for bogus TSC timecounters.

[Poul-Henning Kamp]

In message <200308061505.h76F5Sih048392 at repoman.freebsd.org>, Poul-Henning Kamp
 writes:
>phk         2003/08/06 08:05:28 PDT
>
>  FreeBSD src repository
>
>  Modified files:
>    sys/i386/i386        tsc.c 
>    sys/i386/include     clock.h 
>    sys/i386/isa         clock.c 
>  Log:
>  Dont initialize a TSC timecounter until we know if it is broken or not.

This will affect a number of other chips with bogus TSC's, and possibly
even take care of the K5/K6 CPU thing

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.