from 0xFFFF.FF64 to 0xFFFF.FF9C are mentionned as Reserved! However memsetup.S uses a lot the following addresses: SDRC_CR 0xFFFF.FF98 SDRC_MR 0xFFFF.FF90 SDRC_TR 0xFFFF.FF94 Where did Gary Jennejohn got this infos? Regards - Luc