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Creating a Symbol Table

There are several ways to create an application symbol table. Only two are compatible with the example provided here: First, you can build a symbol table into the base firmware with a symbol table added to your board-specific bring-up logic(Normally this technique would only be used in the KERNEL build mode when CONFIG_USER_INITPATH=y. In that case, the system start up is not performed by a C call to a main function like nsh_main(). Rather, the system starts up with an init ELF program (much the way that Linux does). CONFIG_EXECFUNCS_SYMTAB_ARRAY then solves that problem by initializing the system to provide the basic symbols needed by the init program and nothing more. The init program would probably call boardctl() to put the final symbol table in place. We do things this way here just for simplicity.). To use this method, you would need to (a) enable support for this feature via CONFIG_EXECFUNCS_HAVE_SYMTAB=y and (b) provide a symbol table with the global name CONFIG_EXECFUNCS_SYMTAB_ARRAY with the variable name CONFIG_EXECFUNCS_NSYMBOLS_VAR that holds the number of symbol entries. The symbol table name defaults to g_symtab.

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