Is it possible to make Trgra K1 use 32bit SDRAM?

I design a board myself,and the sdram 3 and sdram 4 are not correct.But I wish to continue with only the sdram 1 and 2.
I remove the sdram 3 and 4 from my borad, and try to flash myboard but failed.

Someone said chaning the BCT files may solve the problem. The file like "Hynix_2GB_H5TC4G63AFR-RDA_792MHz.cfg"is the BCT file, isn’t it? how to modify it? Is there anything esle I should do?