Hello,
the libraries for the DSP/BIOS legacy API seem to be missing in SYS/BIOS 6.40.01.15. I couldn't find anything about this change in the release notes.
The source code is still there and the libraries can be built by renaming the "package.bld,nobld" files under "bios_6_40_01_15\packages\ti\bios(/support)" to "package.bld".
Thanks,
Ralf