Hello,
You could find detail information in Documentations (Reference Manual, DataSheet), Application Note (AN5031) or Wiki (e.g. https://wiki.st.com/stm32mpu/wiki/STM32MP15_ROM_code_overview)
To sum-up, we are able to connect simultaneously many interface, if package pin count and your pinout usage allow it (your could quickly test using STM32CubeMx).
e.g. a typical usage similar to STM32MP157C-EV1 board
- SD-Card 4-bits on SDMMC1
- eMMC 8-bits on SDMMC2
- Serial-NOR 4-bits and/or Serial-NAND 4-bits on QUADSPI
- SLC-NAND 8 or 16-bits on FMC
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