Dear Wolfgang, Just forget my last email I finaly found out the tutorial and proceed as follow: #git-clone git://www.denx.de/git/u-boot.git u-boot #cd u-boot #git branch dzu at denx.de * master origin testing-4xx_enet testing-NAND testing-USB wd at denx.de #git checkout dzu at denx.de #git pull I guess that is the way. Regards.