CPU TYPE in /etc/default/make.conf

[FLYING LI]

my CPU is AMD Duron 600.and it is said that FreeBSD
can reconginze CPU TYPE such as AMD k7 k6 and Intel
i686 i586... in /etc/default/make.conf .So,I set my
CPU TYPE as k7 in make.conf.but when i run make world
or compile else source code,the screen output always
said"-O3 -march=k6".why not march=k7 ????  should I
set CPU TYPE as i686 instead of k7?In addition,I set
CPU as i686 in my kernel.
thanks a lot!

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