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The layout, or assignment of FlexRAM banks to memory regions, is more
precise than the count. When a user specifies the count, we still apply
the same layout as we always have. But now, by default, we prefer the
fuse layout for users who have made no choice.
This commit supports RAM loading with probe-rs. After probe-rs resets
the MCU and uses the fuse FlexRAM layout, firmware can perfectly match
that layout without disrupting the data already copied into RAM by the
debugger.
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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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No need for us to set VTOR and the stack pointer anymore.
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