OpenWrt for mini2440

I want to transplant OpenWrt to the mini2440,but don't konw how to modify
the Makefile of/target/image. The system of mine is ubuntu 10.10. I need 2
different jffs2.bin to support different flash(erase block is 64K and 128K)
of mini2440. The file is the info of the Makefile, I'm a new to here, hope
someone can help me and forgive my poor English.