The attached ebuild provides all the tools necessary to manage cramfs filesystems
under Linux. Cramfs is used for initrd boot environments.
Created attachment 2341 [details]
ebuild for cramfs
I guess it's already in the tree:
sys-apps/cramfs [ ~x86 ~ppc ~sparc ]
Description : Linux filesystem designed to be simple, small, and to compress things well
Home page : sf.net/projects/cramfs/