Hi,
I think, without RAM you can't,
If you dont have RAM then where you will execute the application?
Where did you download this nand writer project?
Whether it is belongs to AM18x ?
Download starterware package for AM18xx and build it then load to your board through emulator.
http://processors.wiki.ti.com/index.php/StarterWare
http://software-dl.ti.com/dsps/dsps_public_sw/am_bu/starterware/01_00/index_FDS.html
http://processors.wiki.ti.com/index.php/StarterWare_Getting_Started_01.00.XX.XX
http://processors.wiki.ti.com/index.php/StarterWare_01.00.01.01_User_Guide