Jose,
The default configuration object is defined in the CFG_<platform>.c file. For OMAP-L138, I expect it to use:
dsplink/config/all/CFG_OMAPL138GEM_SHMEM.c
The object in that file is called DA8XXGEM_SHMEM_Config. Look in the Programmer's Guide Section 3.2.1 for an example on how to override the default configuration.
Look in Section 6.2.4, under the heading 'Change in name of top-level configuration object for DSP'. It explains that LINKCFG_config is a generated structure. You should be able to find this structure in a generated file after you run the dsplinkcfg.pl script.
Look in
dsplink/gpp/src/api/proc.c
for the function PROC_setup(). If linkCfg is NULL, it uses LINKCFG_config.
~Ramsey