query related to fuse default key in NTM88

[Chan_17]

Hi Nxp Team,

We are using Bare KW45 MCU and i am flashing merging sb3 file present in sdk example but wireless is not working for the mcu.

Can Nxp team help us how to fuse default key in the bare MCU and cm33 image processing is required if i will program default key in fuse. And if not required cm33 image processesing what will be the process?

[luis_maravilla]

Hello

The Application note AN14003 explains the process for setting up the environment for the certificate, preparing the keys and load the NBU image in a KW45 MCU.

AN14003: Programming the KW45 flash for Application and Radio firmware via Serial Wire Debug during ...

Could you help us clarify what do you mean when you mentioned the wireless didn't work? Did you already burn your fuses in your board with the KW45?

Can you help us updating the NBU firmware? In chapter 5.2 is described that an issue would occur when the Bluetooth Low Energy Stack is initialized, so you need to use a flag stored in a nvm to indicate whether to perform the normal Bluetooth low energy process or perform burn NBU image process.

If you have an KW45 EVK board, Just for testing purposes, Can you help us test the sb3 file in the EVK?

The tool you will need for fuse default keys its "Jupyterlab" described in chapter 4. If your unfamiliar with the tool you could try this link for the installation and a tutorial. spsdk/examples/jupyter.rst at master · nxp-mcuxpresso/spsdk

The process for generating the sb3 file is described in chapter 5.1.1

First, we need to prepare the keys and certificate please refer to Chapter 4.2, then search for the Default OEM keys for KW45 EVK; In Chapter 5.2.1 you can found the keys values and more information about this

-To see how preparing the keys and certificate for RoTKTH (CUST_PROD_OEMFW_AUTH_PUK) Refer to Chapter 4.2

-You can find the default keys for KW45 EVK board values in Chapter 5.2.1 Default OEM keys

Best Regards

Luis