Can i use iMX RT1020 Boot ROM 96KB?

[jtro]

I'm using iMX series first time and i have question about boot ROM?

1) Can Boot ROM memory space is user programmable like internal ROM?

2) How to implement custom user specified bootloader? Any user manual?

3) If boot ROM is modifiable then where is the default bootloader source code so i can modified that?

My purpose is to update user application (.bin file XIP mode which is encrypted and can use on the fly decryption).

[Yuri]

Hello,

  i.MX Boot ROM cannot be modified and its sources are not provided.

Customers can use API, provided by the on chip ROM, that allows the use of the

HAB library to extend the root of trust and authenticate additional software images.

Look at HABv4 RVT Guidelines and Recommendations Application Note for more

details.

https://www.nxp.com/docs/en/application-note/AN12263.pdf 

  Customers can consider i.MX RT1020 Flashloader as an example of custom user specified

bootloader. Its sources may be found in mcu-boot\ directory in the i.MX RT1020 SDK package.

Welcome | MCUXpresso SDK Builder 

Have a great day,

Yuri.

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[jtro]

As I referred few documents and understood that if i need to update firmware by any custom protocol then i have to have secondary bootloader which execute from external flash and will execute custom Firmware update process.

It means I have to make  two regions in Flash Secondary bootloader and Firmware. When device is powered ON primary bootloader (inside ROM) will jump to secondary bootloader. Secondary bootloader will verify Firmware Image stored in Flash OR check for Firmware update request, If request not received and Image is OK then it jumps to Image location.

1) How to program fuse bits and Encryption key inside ROM? Any utility available? Any sample code?

2) Can I program Encryption key multiple times?

[Yuri]

Hello,

   Use "How to use i.MXRT Security Boot" Application Notes for more details.

< https://www.nxp.com/webapp/sps/download/mod_download.jsp?colCode=AN12079&location=null&appType=moder... > 

Regards,

Yuri.