arch: arm: cortex_a_r: Improve support for big endian #72693
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When this bit is not set, it defaults to 0 (little endian). This causes issues for big-endian devices, as data will be accessed using little endian. Signed-off-by: Sigmund Klåpbakken <sigmundklaa@outlook.com>
Sets the property `PROPERTY_OUTPUT_FORMAT` to `elf32-bigarm` when `CONFIG_BIG_ENDIAN` is set to `y`. Signed-off-by: Sigmund Klåpbakken <sigmundklaa@outlook.com>
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This enables support for big endian Cortex A/R devices. The pull request consists of two changes:
PROPERTY_OUTPUT_FORMATtoelf32-bigarmwhenCONFIG_BIG_ENDIAN=yCPSRregister, ensuring that the CPU stays in big endian mode when switching to the main thread. Without this, data accesses used the wrong endianness, causing a (very big) headache.The
CPSRissue was the only problem I noticed when porting theTMS570LS1224big endian Cortex R4F SoC. With this fixed, it seems to work completely fine. My setup is available at https://github.com/OrbitNTNU/zephyr-hw if that is relevant.