Scatter-loading gives you complete control over the grouping and placement of image components.
You can use scatter-loading to create simple images, but it is generally only
used for images that have a complex memory map. That is, where multiple memory regions are
scattered in the memory map at load and execution time.
An image memory map is made up of regions and output sections. Every region in the memory
map can have a different load and execution address.
To construct the memory map of an image, the linker must have:
Grouping information that describes how input sections are grouped into output
sections and regions.
Placement information that describes the addresses where regions are to be located in
the memory maps.
When the linker creates an image using a scatter file, it creates some region-related
symbols. The linker creates these special symbols only if your code references them.
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