In section 2.3 we introduced the boot function boot without much explanation. Yet there is no set specification for this function, and the programmer is free to change the settings for this function using the spec file, which we introduced in Chapter 1.
The spec file specifies the final ROM image information for the compiled object files when they are linked.
|List 2-6 See basic2 "spec"|
Take a look at the actual spec file for the basic2 program. On line 7, you see the following description:
As you probably already understand, if for example, you were to write "entry afunc" here, the function afunc would become the boot function that is executed when the program is activated (if you use NuSystem, please call nuBoot). You can also specify with the spec file, the array to be used as the framebuffer area (the program, and not the spec file, determines what it will be used for).