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Root regions

A root region is an execution region with an execution address that is the same as its load address. A scatter file must have at least one root region.

One restriction placed on scatter-loading is that the code and data responsible for creating execution regions cannot be copied to another location. As a result, the following sections must be included in a root region:

  • __main.o and __scatter*.o containing the code that copies code and data

  • __dc*.o that performs decompression

  • Region$$Table section containing the addresses of the code and data to be copied or decompressed.

Because these sections are defined as read-only, they are grouped by the * (+RO) wildcard syntax. As a result, if * (+RO) is specified in a non-root region, these sections must be explicitly declared in a root region using InRoot$$Sections.