[U-Boot-Users] Patch approvation procedure

Hi, Just for curiosity I'd like to know (and understand) what is the patch approvation procedure. For example I posted a PXA270 MAINSTONE patch on 9/3/06 and then Wolfgang added it with the new system on 1/4/06 [DNX#2006040142000295] Which are the requirements for approvation and subsequent insertion in the development tree ? TIA