STM32MP15x bare metal approach

[dchen]

After reading documents, I understand the practical boot sequence of STM32MP1 is BOOTROM->TF-A->U-boot->Kernel->file system

In my use case, I prefer to use Windows and write code in bare metal, without U-boot and device tree involved.

1 I think the boot sequence will be BOOTROM->TF-A->bare metal binary?

2 I tried STM32MP15x starter package in Windows, by using STM32CubeProgrammer, to flash binaries to NVM such as NAND, and NOR etc.

If I understand correctly, is FIP section in the tsv file assigning the partitions of NAND flash and NOR flash?

If I want to go with the boot sequence I mentioned above, is there a way I can modify FIP bin/access the source code in Windows, and change NAND flash partition?

3 Is there an identification header, like the 256 bytes header that TF-A contains, needs to be attached to my bare metal binary?

Thanks in advance.

dchen

[Erwan SZYMANSKI]

Hello @Community member​,

ST does not provide bare metal support for MP15, but I already saw a community project on Github that could answer your question. The link is the next one: https://github.com/4ms/stm32mp1-baremetal

I hope that it will help you in your project.

Kind regards,

Erwan.

[Kevin HUBER]

Hello @Community member​ ,

For information this community project is also visible in the "Project" part of the community.st:

https://community.st.com/s/project/a8g3W000000fxc1QAA/stm32mp1-baremetal-example-projects

Best Regards,

Kevin

[dchen]

@Erwan SZYMANSKI​ @Kevin HUBER​ 

Thank you for sharing this repo. Yes I saw this repo earlier and did some exercise. If I still want to use STCubeProgrammer to load my code to NAND/QSPI, is there a way I can do it? Could you give me some hints on Q2 and Q3?

[PatrickF · Accepted solution]

Hi @Community member​ 

CubeProgrammer is intended to connect to uBoot, so unless you use an existing ST development board, you have to build a TF-A and uBoot adapted to your board in order to load a custom bare-metal FSBL inside the Flash.

You could also look at https://wiki.st.com/stm32mpu/wiki/STM32CubeProgrammer_flashlayout and AN5275.

But I remind that Cortex-A7 bare-metal solution is not part of ST standard delivery, so you will have to be clever enough as you will find very few examples and limited support from ST.

Regards.

[dchen]

Thanks for letting me know Patrick