Texas Instruments TMS320 User Manual page 53

Using DSP/BIOS with the Run-Time Support Library
Note:
It is recommended that you use the DSP/BIOS library version of malloc,
free, memalign, calloc and realloc within DSP/BIOS applications. When
you are not referencing these functions directly in your application but call
another run-time support function which references one or more of them,
add '-u _symbol', (for example, -u _malloc) to your linker options. The -u
linker option introduces a symbol, such as malloc, as an unresolved symbol
into the linker's symbol table. This causes the linker to resolve the symbol
from the DSP/BIOS library rather than the run-time support library. If in
doubt, you can examine your map file for information on the library sources
of your application.
Program Generation 2-23