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Booting STM32MP1 without GPT partition table

PTewa.1
Associate II

‎2021-01-20 5:21 PM

We have product built around STM32MP1157C and boots up with GPT partition table. However, we would like to boot it up with DOS (MBR based) Partition table. As per the documentation - section 4.3 of https://wiki.st.com/stm32mpu/wiki/STM32MP15_ROM_code_overview, it seems GPT is not mandatory for STM32 ROM code to locate FSBL. So, accordingly, I dumped u-boot-spl.stm32-mp1som-pxl7-basic at LBA 34 (at offset 17K), but it fails to boot up.

Any help in this regard is highly appreciated.

Thanks,

Pradeep

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Olivier GALLIEN
ST Employee

‎2021-01-21 1:13 AM

Hi @Community member​ ,

Can you please confirm you are booting from SDCard ?

Can you describe further "but it fails to boot up" ? Any log trace ?

What is status on PA13 ( see https://wiki.st.com/stm32mpu/wiki/STM32MP15_ROM_code_overview#Debug_and_Error_messages )

Olivier

Olivier GALLIEN
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PTewa.1
Associate II

‎2021-01-21 3:48 AM

Hi Olivier,

Thanks for the response.

Yes, I am booting up from SDcard.

By 'fails to boot up', I mean the FSBL never comes up as I don't see any logs on the debug console. However, same FSBL comes up, if I use the gpt partition table.

I haven't checked the status of PA13. I would check & let you know soon.

Thanks,

Pradeep

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PTewa.1
Associate II

‎2021-01-21 8:44 AM

Hi Olivier,

Unfortunately, we don't have pin PA13 directly accessible on the board, neither we have a debugger to get the logs. However, it would be very helpful if you could point me to some instructions which guides on the booting up with non-GPT partition table. This is what I did:

  • Created the MBR (DOS) based partition table with fdisk
  • Dumped FSBL on the SD Card with:
    • dd if=u-boot-spl.stm32 of=/dev/sdc conv=fdatasync,notrunc seek=17408 bs=1

Regards,

Pradeep

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Olivier GALLIEN
ST Employee

‎2021-02-18 7:23 AM

Hi @Community member​ ,

It appears that wiki information maybe erroneous.

Bootrom is looking at LBA128 (offset 64KB) for FSBL1 and LBA640 ( offset 320KB) for FSBL2.

Please give it a try.

FYI, MBR support is not integrated in our TF-A trusted boot solution, which is the one recommended.

Basic boot is no longer supported since Version 2.0.

As matter of curiosity what prevent you to use GPT partitioning ?

Thx

Olivier

Olivier GALLIEN
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