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This can be used on small systems to save RAM if the SHM object doesn't need to be cache-aligned. Signed-off-by: Jukka Laitinen <jukka.laitinen@tii.ae>
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@dakejahl Could we have this in px4 nuttx branch? It is no-op in current mainline, but if I want to continue on the the SHM uORB pr, this would be good to have. My boards do work without, but without this backport the SRAM waste is big. |
dakejahl
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Sep 21, 2026
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link to the upstream PR?
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Summary
This is a backport from NuttX mainline, which can be used on small systems to save RAM if the SHM object doesn't need to be cache-aligned.
Impact
Has no impact on the current PX4, which doesn't use posix shm for anything, but is needed for PX4/PX4-Autopilot#27331 to reduce SRAM consumption.
Testing
Tested on fmu-v5, fmu-v5x, fmu-v6xrt w. the SHM-based uORB implementation.