Bootloader: http://www.denx.de/wiki/U-Boot/SourceCode (git://git.denx.de/u-boot.git) Kernel: http://github.com/beagleboard/linux Angstrom root file system: http://github.com/beagleboard/meta-beagleboard Debian root file system: https://github.com/beagleboard/image-builder Cape overlays: https://github.com/beagleboard/bb.org-overlays
https://elinux.org/Beagleboard:BeagleBoneBlack_Rebuilding_Software_Image