The initial entry point must meet the following conditions:

• The image entry point must always lie within an execution region.

• The execution region must not overlay another execution region, and must be a root execution region. That is, where the load address is the same as the execution address.

If you do not use the --entry option to specify the initial entry point then:

• If the input objects contain only one entry point set by the ENTRY directive, the linker uses that entry point as the initial entry point for the image.

• The linker generates an image that does not contain an initial entry point when either:

  • More than one entry point has been specified by using the ENTRY directive.

  • No entry point has been specified by using the ENTRY directive.

For embedded applications with ROM at zero use --entry 0x0, or optionally 0xFFFF0000 for CPUs that are using high vectors.