Hello Sujin,
There is no need to redo everything. This configuration already exist for the LM3S9B96. You can download the source from http://www.ti.com/litv/zip/swrc240b
You can also find all the drivers on the LM3S9B96 product page in the software section. Even though the LM3S is NRND, all the documents and software are still available.
http://www.ti.com/product/lm3s9b96#softTool
Thanks,