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The 1180 family uses a different boot header than previous families. The
header is generated to support the default configuration where hash and
signature errors are ignored.
The XIP `__pre_init` strategy is still used, more for ease of getting
something running than because of any known problems with the boot ROM's
implementation of loading images to different memories.
The boot ROM for the 1180 does not appear to allow the entry point to
lie outside the (loaded or execute-in-place) image, so a new `.xip`
section is added after the vector table to put the address inside the
image while keeping VMA=LMA. This could cause problems for tools that
manipulate binaries based on section names.
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If you define a runtime, you can call `stack_size_env_override` to
define an optional environment variable checked by the runtime builder.
Same goes for the heap. A user can set these environment variables to
override the runtime's stack / heap size. You can use this package's
examples to try it out; see the updated build script.
There's no default environment variable for either memory region. The
package that defines the runtime needs to opt-in to this feature.
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We can still maintain individual linker script components, then write
them into one, larger linker script. We're effectively implementing the
same behavior as INCLUDE while disallowing overrides of the linker
search path to find the INCLUDEd files.
Once we have one linker script, we can refactor for easier unit testing.
This commit adds simple unit tests for the default builder, and some of
the expected errors.
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Might help the next person who wants to add a new family. There's a way
to defeat this lint when the enum is (Partial)Eq: use if / else to
emulate a fallthrough. I can't find _another_ lint that would prevent
that pattern, so I'll try to be vigilent here.
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