How to reserve an Elf e_machine value

[Stephen Andieta]

I am working on a compiler kit for an in-house processor that uses Elf as 
object file format. Since this compiler will be released to external customers, 
I need to reserve an 'official' e_machine value for this processor. Somehow I 
am unable to find out how to reserve such a value. How should I do this?
 
Thanks,
 
Stephen.