TMS320C6745: tms320c6745

AISGen tool is not tied to CCS 12.8. It is an independent tool. You can generate the .out files from compilation in CCS and then use AISGen to convert to boot image. AISGen tool is provided from Bootloader app note here:

Using the TMS320C6747/45/43 Bootloader (Rev. C) (ti.com)

Thanks and Regards,

Rahul Prabhu