flash usage reduction ideas

[dagar]

Small flash saving Ideas

1. generated parameters array split by type and store volatile separately
2. board/ defined startup mechanism (rc.sensors_board) - allow boards to supply an rc.board init #10960
3. Change runtime DEVICE_DEBUG to PX4_DEBUG (Drivers switch most DEVICE_DEBUG -> PX4_DEBUG #9770)
4. uORB messages split message fields string into pieces (allows dedup)
5. ModuleBase - consider design options that could allow refactoring with a base class such that more could be shared instead of duplicated template code.
6. Add support for parameter instances. There are a significant number of parameters that are identical other than an index (eg CAL, RC, PWM). The same underlying parameter metadata could be shared.
7. review Param template (there are possible ideas here we can come with 1. to reduce some code bloat)
8. delete old/advanced mode switches
9. Review ROMFS airframes and mixers (quite a few unused and nearly identical configurations and mixers)
10. add minimal build option that disables various strings (PX4_INFO, PRINT_MODULE, etc) as mentioned by @bkueng (FLASH space analysis #9460 (comment))

Larger Projects

1. NuttX compressed ROMFS (huge savings, but large effort to update NuttX)
2. Driver updates (refactor common code, delete IOCTLs, etc)

Related - #9460

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

Closing as stale.