Hi Hirogens,
The configuration described should work as MII1 and GPMC interfaces have no pins in common and pins shown in the figure can be used for SDIO interface.
Some resources that can help with pin multiplexing:
1. TI pinmux tool: https://dev.ti.com/pinmux/
2. Pin mapping between AM335x and OSD335x family: https://octavosystems.com/app_notes/osd335x-family-pin-assignments/
3. Device tree examples and building: https://github.com/RobertCNelson/dtb-rebuilder
Best,
Neeraj
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