Mini howto build toolschain and initramfs on Linux

Could you provide unified patches for this? Maybe it's time to refresh the patches for buildroot; though I most of the changes seem already available.

I think it would be really nice if we could unify these efforts to have a native GNU/Linux toolchain, since commercially noone seems to be interested in this (resulting IMHO in less good systems: it simply does not make sense developing Linux on a Windows machine, it's like trying to join the traffic on a highway with a bicycle).