On STm32MP157c, what pins on package TFBGA361 do we need to use if we plan on programming the bootloaders onto eMMC via UART?

[SLetter]

Correct me if I'm wrong. UART4 is used to program eMMC via the ROM monitor. Exactly what GBA pins are used? Is there any "special" circuitry involved?

[Olivier GALLIEN]

Hi @nonesuchetter​ ,

I suggest you refer first to https://www.st.com/resource/en/application_note/dm00389996-getting-started-with-stm32mp151-stm32mp153-and-stm32mp157-line-hardware-development-stmicroelectronics.pdf

You will find all constraint related to UART and eMMC usage in a design.

Then use CubeMX selecting a TFGA361 package to work on related pinmux.

Hope it help

Olivier

[SLetter · Accepted solution]

Thanks. I found my answer in Application note AN5031.
Steve Letter