Jump to bootloader from softdevice

[HuanVH]

Hello,

I am creating a bootloader ble version without using dfu. I am having problems turning on softdevice, softdevice starts the app instead of continuing the bootloader.

I have consulted through dfu, I find sd_softdevice_vector_table_base_set may help me, but it does not work, the chip still jumps to the app instead of the bootloader.

Please help me, thank you

SDK: 15.3 - Softdevice: 6.1.1 - SoC: nRF52832

[bjorn-spockeli]

Hi Huan, 

have you written the bootloader start address to the UICR.NRFFW[0]  register? See Bootloader for more information. 

Best regards

Bjørn

[HuanVH]

Thanks for answer

I created a uart bootloader version without using softdevice, it runs pretty well, I can debug it with jlink.
With the next version of the ble platform, I couldn't debug using jlink, I customized the ble_app_template example for the bootloader.
Currently I have the ble bootloader turned on, then start the normal application. How can I reduce the size of my code below 24kB? I removed the log, peer manager. Add a service with 2 characteristics, fs_storages, uart.
Thanks

[bjorn-spockeli]

Hi Huan,

We already have a Secure UART bootloader that does not use the SoftDevice in our SDK. The size of this is ~24kB and this is optimized as far as possible to reduce the size of the bootloader. If you want to reduce the size further then you will have to remove functionality, e.g. if you do not need the complex cryptographic signature verification then you can remove this, but this is something you will have to do on your own. 

Best regards

Bjørn

[HuanVH]

Many thanks