Hello,
I have a custom board based on STM32MP151-C with an eMMC on the following pins:
- SDMMC2_CK PE3 (AF09)
- SDMMC2_D0 PE6 (AF07)
- SDMMC2_CMD PG6 (AF10)
I read that the ROM expects the the SDMMC2_D0 pin on PB14 so I need to change it by using values from the OTP. I found this link (https://community.st.com/s/question/0D50X0000AkQJiHSQW/how-to-change-emmc-interface) and did the same as the ST Support, just for my pins. Here are my results.
- OTP3 = 0x00000004 SDMMC2 (uses non default AFmux defined in OTP)
- OTP5 = 0x38745394
- SDMMC2_CK = PE3 (bits[15:0]: port0=5=GPIOE, pin0=3, afmux0=9, mode0=4=AF;pull-up;medium-speed)
- SDMMC2_D0 = PC8 (bits[31:16]: port1=3=GPIOC, pin1=8, afmux1=7, mode1=4=AF;pull-up;medium-speed)
- OTP6 = 0x000076A4
- SDMMC2_CMD = PG6 (bits[15:0]: port2=7=GPIOG, pin2=6, afmux2=10, mode2=4=AF;pull-up;medium-speed)
Could someone please let me know if I calculated the OTP values correctly? So I dont brick the board.
PS: How do I determine the speed on the pin (low, medium or high)?
Thanks.
