PiBox

It's not easy to figure out if a tree build is for rpi or rpi2. There are two things to do here.

1. Add HW=$(HW) to /etc/pibox_version in the scripts/postbuild.sh script.
2. Add a make target to check what CT_ARCH_CPU is set to for xcc. The match is in src/xcc/xcc.$(HW).$(xcc-version) and the check should be in build_dir/crosstools-ng.$(version).bld/.config.

The something like

make show-build

Would provide information about what the current build is for.