OK, this tip might not be exactly right for grml, but still: since grml is working on new processor architectures like PPC and 64-bit x86 (and don't forget 64-bit PowerPC!).

T2 Linux is all about re-targeting. It impressed us by booting obscure machines on which other "ported" distributions croak. It runs many OEM eval boards. There might be ideas here to help porting work. Just fyi.

http://www.t2-project.org/about.html "T2 is highly portable. Adding new architectures is easy and can be done within a day!"