1Over time, support for more and more boards gets added to U-Boot - 2while other board support code dies a silent death caused by 3negligence in combination with ordinary bitrot. Sometimes this goes 4by unnoticed, but often build errors will result. If nobody cares any 5more to resolve such problems, then the code is really dead and will 6be removed from the U-Boot source tree. The remainders rest in peace 7in the imperishable depths of the git history. Please use the tools 8git provides to read through this history. A common example would be: 9$ git log -p --follow -- board/technexion/twister 10to see the history and changes made to the Technexion "twister" board 11from introduction to removal. 12