This is my sdk for usage with slackware on A20 devices like bananapi, cubietruck and olimex-som. For more info see https://github.com/tjohann/a20_sdk .
Makerootfs makes it easy to build a root filesystem for embedded devices (e.g. ARM based) by automating the cross-compiling process through shell scripts, patches and default configs. Unlike buildroot which uses uClibc, makerootfs uses the full glibc.