status of kexec for ppc on 2.6.10, any gotchas?

I've been asked to look at kexec for ppc on 2.6.10.  The syscall appears 
to be present, but there seem to be additional patches for 2.6.10-mm at:

http://www.xmission.com/~ebiederm/files/kexec/

Are these patches needed?

I haven't been able to find any current official documentation, although 
I found some old stuff from 2.5 and a writeup at:
 
http://www-128.ibm.com/developerworks/linux/library/l-kexec.html?ca=dgr-lnxw04RebootFast

Is there any official HOWTO on this?  Any issues I should look at in 
particular?

Thanks for any pointers,

Chris