Hi
I have been put into at task with a nrf52832 device (Mesh) that can only update the application.
This is a big problem because we already have multiple device all over the world and now want to update to SDK 15.2 (softdevice 6.1.0) for use with latest Mesh version, new app and offcourse a new bootloader.
Because of this situation I have created application that embeds 3 part
1) MBR + Softdevice (6.1.0)
2) New bootloader + MBR + Settings
3) A copy program that is placed to just below the new bootloader address and runned after changing the UICR->NRFFW[0] pointing at my copy program and NVIC_SystemReset().
The first 2 part are taken from at running device with SDK 1.52 and bootloader, without any application. And it is offcourse verified to be able to update softdevice/Bootloader/application :-)
I have used the Segger JLink command savebin to get the 2 part, convert from bin to c-array and finally embedded them into my application.
The new bootloader includes debug info, so the default address are changed and my memory map look like this:
UICR->NRFFW[1] (0x10001018) = 0x0007 E000 (Address of MBR parameter storage)
UICR->NRFFW[0] (0x10001014) = 0x0006 A000 & 0x0007 0000 (Address of Bootloader )
Bootloader settings 0x0007 F000 - 0x0008 0000 (4 kB)
MBR parameter storage 0x0007 E000 - 0x0007 F000 (4 kB)
Bootloader 0x0007 0000 - 0x0007 E000
RECOVERY_COPY_APP 0x0006 A000 - 0x0007 6FFF
RECOVERY_INFO 0x0006 9000 - 0x0006 9FFF
RECOVERY_MAIN_APP 0x0002 6000 - 0x0007 1000
SoftDevice 0x0000 1000 - 0x0002 6000 (148 kB)
Master Boot Record (MBR) 0x0000 0000 - 0x0000 1000 (4 kB)
For the moment I can update the device with my recovery application and run RECOVERY_MAIN_APP and RECOVERY_COPY_APP where i change the UICR->NRFFW[0] before each NVIC_SystemReset(). The leftover from RECOVERY_MAIN_APP is also erased, so it is not recognized as an application.
Finally I ends up with a device that contains "exactly" the same as the running device with softdevice 6.1.0 and my new bootloader, but it is not running (going info DFU mode).
Any idea of what I'm doing wrong ?
Additional questions:
1) Will the device go into DFU mode if the MBR and Settings data is erased with only MBR+SD+BL flashed ?
2) I have noticed that the MBR also contains default data/references to Bootloader address and MBR data as placed in the UICR->NRFFW[1] and UICR->NRFFW[0].
Should I only be concerned about UICR->NRFFW[..] ?
3) Is there a way to jump directly into another application without doing the UICR->NRFFW[0] / NVIC_SystemReset() ?
Thanks :-)
