How to activate the app on the nRF52840?

The https://github.com/crownstone/bluenet/tree/compile-for-host branch has now support for the nRF52840 in the form of the PCA10056 dev. kit.

Check the following things:

It should use the same Softdevice S132 version 7.2.0 as with the nRF52832 that has already been tried. The size of the Softdevice should be checked, but that shouldn't be a problem.
In nrf_bootloader_fw_activation.c the &s_dfu_settings.bank_1 struct is used, but on make write_bootloader_settings in the nrf52840 build directory, the current bank is 0 and that bank code is 1. This in contrast to nrf_bootloader_fw_activate which will inspect bank 1, checks p_bank->bank_code (which is 0, all fields are zero) and then returns ACTIVATION_NONE.
By manually changing the above to &s_dfu_settings.bank_0 it tries to activate, but fails.
In (gdb) p s_dfu_settings shows the same settings as make write_bootloader_settings so writing succeeds.

How to properly activate the app on the nRF52840? (And why does this succeed on the nRF52832?)

crownstone / bluenet