SDMMC2_D7 of OSD32MP1-RED

[SylvainB]

Hi,

The D7 bit of the RED’s EMMC interface is PC7. My understanding of AN5031 is that the BootROM uses PD3 by default.
Is it correct?

Our own board design uses the same EMMC I/O mapping as the RED.
Will I need to change any OTP parameter to make it boot successfully? If so, how?

BTW, please, tell me all OTP parameters which are specific to the RED board.

Thank you in advance !
Sylvain.

[Neeraj Dantu]

SylvianB,

 

As shown in Section 4.4 of Boot Chain Overview(https://wiki.st.com/stm32mpu/wiki/STM32MP15_ROM_code_overview#Boot_from_e-E2-80-A2MMC-E2-84-A2), only CK, CMD and D0 are utilized for eMMC boot by the ROM code. So, you can use PC7 for the D7 bit of the eMMC interface as you can setup the pin in device tree for the bootloader. You will not need to change any OTP parameter for eMMC boot. OSD32MP1-RED does not come with any OTP pre-programmed.

Best,

Neeraj

[SylvainB]

Thank you, Neeraj !

[Author]

Posts