Sdram less updater

I am working on Sdramless of updater now. The .text part can be less than 100kB. However, the memory usage is much more than I think. After adjustment, the memory size is fit on OCRAM now. However, SDRAM l2 table in SDRAM which can not move to OCRAM now. I would like to take a look on MMU initliazation part first.