[STM32H7] Provisioning fs reformat

[andreagilardoni]

Changing flash partitioning scheme in order to make room for a KV store

[pennam]

There is no need to erase the whole flash before repartitioning; you only need to erase the MBR.

root.init();
root.erase(0x0, root.get_erase_size());

Furthermore if you keep the KVstorage in partition 3 for both schemes you should be able switch between them without erase the MBR at all

mbed::MBRBlockDevice::partition(&root, 1, 0x0B, 0, 1024 * 1024);
if(default_scheme) {
  mbed::MBRBlockDevice::partition(&root, 4, 0x0B, 14 * 1024 * 1024, 14 * 1024 * 1024);
  mbed::MBRBlockDevice::partition(&root, 3, 0x0B, 13 * 1024 * 1024, 14 * 1024 * 1024);
  mbed::MBRBlockDevice::partition(&root, 2, 0x0B, 1024 * 1024, 13 * 1024 * 1024);
  // use space from 15.5MB to 16 MB for another fw, memory mapped
} else {
  mbed::MBRBlockDevice::partition(&root, 2, 0x0B, 1024 * 1024, 6 * 1024 * 1024);
  mbed::MBRBlockDevice::partition(&root, 3, 0x0B, 6 * 1024 * 1024, 7 * 1024 * 1024);
  mbed::MBRBlockDevice::partition(&root, 4, 0x0B, 7 * 1024 * 1024, 14 * 1024 * 1024);
  // use space from 15.5MB to 16 MB for another fw, memory mapped
}