Hi Peter,
NOR flash writer is supported only on the EVMs for OMAP-L138 (or DA850, AM18xx). Looks like you are trying in custom design.
To get the NOR flash writer working:
1. Download the PSP package from TI. Refer below links.
http://processors.wiki.ti.com/index.php/Getting_Started_Guide_for_OMAP-L138
2. Modify the NOR flash writer driver to support the selected Flash chip.
3. Build the flash writer using CCS.
4. Then try flashing the NOR flash.
Thanks.