topic Re: Debug in SDRAM with bootloader in i.MX RT Crossover MCUs

Debug in SDRAM with bootloader

biafra — Tue, 28 Nov 2023 16:07:34 GMT

Hi everyone,

I ask help to solve an annoying situation.

I'm working on a custom board with a RT1064 device, MCUXpresso 11.8.1 and PEMicro Univesal Multilink debugger.

In my board I use a custom bootloader that loads the application from the internal QSPI dataflash to the external SDRAM and then jumps to the apllication that runs in the SDRAM: everything is working fine.

I can debug the application in the SDRAM, using a script that initialize the SDRAM controller and loads the application. The problem is that when I start the debug session the bootloader starts and loads in SDRAM the application saved in flash, overwriting the application loaded with MCUXpresso.

To avoid this, I need to write a different application (a blinking led) in the internal flash: in such a case I can successfully debug the application loaded with MCUXpresso in the SDRAM.

So I need to program the bootloader in the internal flash to test the runtime behavior and the blinking led application to debug, switching when as I need.

Is there a way for the bootloader to distinguish that I'm debugging and avoid the application loading from flash to SDRAM?

Many thanks

Biafra

Re: Debug in SDRAM with bootloader

Kan_Li — Mon, 04 Dec 2023 06:56:54 GMT

Hi @biafra ,

How did you set up the boot mode when you start the debug session? Was it in serial download mode? Please kindly clarify.

Have a great day,
Kan

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Re: Debug in SDRAM with bootloader

biafra — Mon, 04 Dec 2023 07:50:37 GMT

Hi @Kan_Li,

Many thanks for your answer.

No, the boot mode is boot from fuses. I set serial download mode only when I need to program the application (boot loader or binking led) in the internal flash with MCUXpresso Secure Provisioning Tool.

Many thanks

Biafra

Re: Debug in SDRAM with bootloader

Kan_Li — Tue, 12 Dec 2023 02:33:15 GMT

Hi @biafra ,

Maybe the easiest way to solve this issue is putting the device into serial download mode before start the debug session.

Have a great day,
Kan