[CC78K4] Startup Module

The startup routine is modified but “_@STBEG” symbols result in an undefined symbol error during linking.

_@STBEG is a symbol that is generated by symbol generation specification option -S that resolves the stack of the linker.
Specify the -S option for linking.
The -S option generates a symbol at the first and last addresses of the largest area in a specified area (default: RAM).

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How should an option byte be set?

Add a module described in assembler and describe the option byte in that module by using the DB pseudo instruction.
One of the simplest ways is to add the option byte to the startup routine.

The following shows an example of setting an option byte.

OPT  CSEG AT 0080H
OPTION:DB  0F1H

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