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Given the way this package abuses cortex-m-rt, it's not immediately
obvious how to register a Cortex-M exception handler with the
`#[exception]` macro. This commit documents and demonstrates the
workaround I use.
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Implemented by following the reference manual, and tested on an
MIMXRT1160EVK. The target adopts all of the same limitations as the 1170
target.
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I derived these values from the reference manual. Tested on an
MIMXRT1040EVK.
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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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Users can define their device configuration data (DCD), and place the
data in the .dcd section. If the .dcd section has content, the entry in
the IVT points at the user's DCD. This plays well with imxrt-dcd.
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