EMMC boot in place of SD card in STM32mp135

[stack_shailesh]

I am using emmc in place of SD-card for custom hardware of STM32MP135FAE7. If FlashLayout_sdcard_stm32mp135f-dk-optee.tsv file will work using STM32cube programmer to upload all boot files??Whether all procedure will be same for boot sequence as we do for STM32mp135f-dk development kit, like switch positions etc.??

Please clear this doubt!!!

[PatrickF]

HI @stack_shailesh 

eMMC boot and SD-Card boot are quite different, but overall concept is same.

By default, eMMC use different pins than SD-Card.

Please refer to https://wiki.st.com/stm32mpu/wiki/STM32_MPU_ROM_code_overview#Boot_from_e-E2-80-A2MMC-E2-84-A2

and flashlayout is slightly different, here is a typical example: https://wiki.st.com/stm32mpu/wiki/STM32CubeProgrammer_flashlayout#e-E2-80-A2MMC

 

For HW concerns, see also AN5474 https://www.st.com/resource/en/application_note/DM00697274.pdf

Regards.

[stack_shailesh]

Hi Patrick,

Can I use FlashLayout_sdcard_stm32mp135f-dk-optee.tsv(which I used for sd-card) for flashing emmc of my custom board? or I have to generate another file for emmc ? If yes then how?

[PatrickF]

Hi @stack_shailesh 

no sdcard one will not work at all (different interface, different offsets), you should have a specific one for eMMC adapted to your HW and the SW you built for your target.

Look at wiki links I provided. It is fairly easy to understand the format and tailor it.

As example, you could also look to MP157F eMMC flashlayout file (e.g. FlashLayout_emmc_stm32mp157f-ev1-optee.tsv) provided in STM3MP1 Starter package. different processor, but same flashlayout mechanism.

File is a text file editable with any text editor (just take care to keep 'Tab' and Linux end of line as in examples).

Regards.