MBR.Hex

[Trump]

我有一个关于MBR的问题。十六进制。此文件的代码是否为开源？我没有在SDK目录中找到任何有关mbr.hex的代码。

[Charlie]

Hi,

Just like softdevice, MBR is also closed source software. We do not provide source code to developers. Any special reason you need it?

Best regards,

Charlie

[Trump]

Hello, I have another question about DFU upgrade.

I downloaded the three files in the picture above to NRF52840 through nrf connect, and the device is still stuck in the bootloader. I have to execute this command (nrfutil dfu serial -pkg blinky_mbr.zip -p COM4) to run blinky_mbr.hex app. I am not at this point. I understand. hoping to get your help.

Best regards

[Charlie]

Hi,

You can find an explanation from this tutorial: https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader#h61sjziauupw1j397q9s9ldr01q4j6d5. Here is content related to your question:

The bootloader looks into its bootloader setting to detect if a valid application is flashed on the chip or not. Boot validation will be performed when booting. If we simply program the application with the bootloader using the programmer, the bootloader won't be able to detect whether a valid app is already exist and it will enter DFU mode instead. Your application won't start. Only after a successful DFU update the bootloader would write to the bootloader setting to mark the valid app.

Best regards,

Charlie