FAI multi-arch

Hi there -

is it possible to use a Raspberry Pi as a FAI server to automagically 
install AMD64 clients via PXE boot?

I am aware that it is possible to create disk images for different 
architectures, but couldn't find any pointers on creating a nfsroot and 
boot images for architectures differing from the FAI host. Any hints 
would be highly welcome …

Thank you very much & with kind regards,
Thoralf.