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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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Most MCUs based on ARMv7-M family processors support some kind of Tightly Coupled Memory (TCM). These TCMs have somewhat different properties for specialized operations. The Depending on the bus matrix of the processor, you may not be able to execute programs from the TCM. For instance, the STM32 F4 supports similar Core Coupled Memory (CCM). It is important to not that you cannot execute programs from CCM!, but since it is tied directly to the D-bus, cannot be used to execute programs! On the other hand, the STM32F3 has a CCM that is accessible to both the D-Bus and the I-Bus, in which case it should be possible to execute programs from this TCM.
When ELF programs are loaded into memory, the memory is allocated from the heap via a standard memory allocator. By default with the STM32 F4, the CCM in included in HEAP and will typically be allocated first. If CCM memory is allocate to hold the ELF program in memory, then a hard-fault will occur immediately when you try to execute the ELF program in memory.
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