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?
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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