Expose unload_partitions to allow for dynamic updates (IDFGH-11498)

[angelnu]

Is your feature request related to a problem?

I wrote an extension of the OTA component for esphome. There I am able to update the partition table OTA.

In order to allow the new partitions to be used without reboot I had to call esp-idf unload_partitions. I have done this by adding my own definition as currently this function is not public.

I need to avoid the reboot since I also need to update the app partition in the same session - this allows changes in partition table sizes and migrations from different firmwares. More info in the PR.

Describe the solution you'd like.

Move

esp-idf/components/esp_partition/include/esp_private/partition_linux.h

Line 240 in c824346

void unload_partitions(void);

to https://github.com/espressif/esp-idf/blob/c8243465e45489835d645bf217a6929fd0c01b7f/components/esp_partition/include/esp_partition.h

Describe alternatives you've considered.

Rebooting after updating the partition table but this does not work when updating the app partition addresses/sizes

Additional context.

Happy to provide a PR

[adokitkat]

Hi, it should now be available in esp_partition.h. The function name changed to esp_partition_unload_all().

[angelnu]

Many thanks @adokitkat - I will switch to use the new name once this commit gets into an official release of the ESP-IDF.

Currently I have

#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 1, 0)
// private function in partition.c to unload partitions and free space allocated by them
extern "C" void unload_partitions(void);
#endif

[adokitkat]

It will be available in the v5.3 version. I can try to backport it to v5.1 and v5.2 as well.

[angelnu]

If you could backport @adokitkat it would be really useful!
The arduino-esp32 is based on v5.1 so it is needed to fully remove the current extern declaration.