When I try to set priorities in certain programs, such as init_priority(HIGH_PRIORITY), I've noticed that during linking, there's no guarantee that the programs will be compiled in the sequence I've specified based on priority. This has led to some runtime errors in my program.
I realized that in the ld file, when initializing dynamic arrays, there's no assurance of initializing init_array.* before init_array. This has resulted in runtime errors in the program. Consequently, I've rearranged the init_array.* in the ld file of NuttX to be placed before init_array and added a SORT operation to init_array.* to ensure accurate initialization based on priorities during linking.
This patch starts to implement the ability to build Meadow.OS for the Meadow F7 board with the NuttX mainline. It will be followed by more patches, progressively enabling full Meadow.OS functionality. This configuration is a work in progress.
The Meadow.OS source code is needed to build this configuration. Meadow.OS is being open-sourced under the Apache 2.0 license. A prototype of the source code release and integration with NuttX is at https://github.com/WildernessLabs/Meadow.OS/tree/prototype
This is the second revision of this patch, as the first one (https://github.com/apache/nuttx/pull/9997) was causing build issues on NuttX CI and was reverted.
This should only impact the Meadow F7 board configurations.
No testing to be done, as the configuration is under development.
replace *(.init_array .init_array.*) with KEEP(*(.init_array .init_array.*)).
The KEEP statement within a linker script will instruct the linker to keep the specified section, even if no symbols inside it are referenced. This statement is used within the SECTIONS section of the linker script. This becomes relevant when garbage collection is performed at link time, enabled by passing the --gc-sections switch to the linker. The KEEP statement instructs the linker to use the specified section as a root node when creating a dependency graph, looking for unused sections. Essentially forcing the section to be marked as used.
Signed-off-by: cuiziwei <cuiziwei@xiaomi.com>
