SPNA198 in section 6 under "Sample Code" says:
"The SPI bootloader Code Composer Studio v5.4 project and Visual C++ host project are available at: processors.wiki.ti.com/.../Category:TMS570."
but searching that web page shows no Visual C++ references or any projects for the PC side of a TMS570LS12x bootloader. Since the date of this document is September 2013, I would suspect that was plenty of time to put one there. Was that idea dropped and if so, what is its replacement?