Allow to define reserved fields in CortexM vector table. #13851
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The ARM CortexM vector table has some reserved fields which are used by some manufacturers to store their custom image information. In particular, NXP QN908X stores the checksum, Code Read Protection, image type and boot block pointer in this region. This patch allows the cpu and board modules to define the value of these fields at build time by defining a macro.
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benpicco
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Area: cpu
benpicco
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CI: ready for build
benpicco
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Apr 14, 2020
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I quickly checked, those are reserved on all Cortex-M cores.
-9 is used by the for the SecureFault interrupt on Cortex-M33 devices with the Security Extension, but those should then not define CORTEXM_VECTOR_RESERVED_0X28.
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Contribution description
The ARM CortexM vector table has some reserved fields which are used by
some manufacturers to store their custom image information. In
particular, NXP QN908X stores the checksum, Code Read Protection, image
type and boot block pointer in this region.
This patch allows the cpu and board modules to define the value of these
fields at build time by defining a macro.
Testing procedure
Defined CORTEXM_VECTOR_RESERVED_0X20 in the cpu_conf.h of a cpu module, compiled the project and verified that the address 0x20 of the vector table in the .elf file contains this value.
Issues/PRs references
This is part of the FR #13852