Question:
Meaning(role) of "__PART_SPECIFIC_HEADERS__"?
Answer:
Defining the __PART_SPECIFIC_HEADERS__ macro is not documented or recommended. If it is defined, the wrappers include more part-specific sys headers, which omit registers that are not available on those parts. For example ADSP-21571_typedefs.h includes sys/ADSP_21571_typedefs.h instead of sys/ADSP_SC573_typedefs.h.