add some comments explaining the general CPU reset code and the AMD Geode SC1100 specific reset code.
add some comments explaining the general CPU reset code and the AMD Geode
SC1100 specific reset code.

From NetBSD

ok mickey@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars