Boot device recommendations

[iguffick]

I’m looking to use the OSD32MP15x in a design. But don’t want to boot from a removable device e.g. SD Card.
Do you have any recommendations for soldered boot devices.

I have looked at eMMC devices. But they are generally available in 0.5mm BGA packages. This somewhat defeats the point of using the OSD32MP15X in it’s relaxed BGA pitch if I still need a PCB design using 0.5mm pitch BGA for the boot device.

So, are there any other options that are in more friendly packages?

Regards,
Ian.

[Neeraj Dantu]

Ian,

STM32MP1 can boot from various removable and non-removable boot devices. Please take a look at https://wiki.st.com/stm32mpu/wiki/STM32MP15_ROM_code_overview for all the boot devices that can be used.

You are right that the eMMC has a small pitch. But, you can still use thick trace widths routing through the NC pins. Please take a look at https://octavosystems.com/app_notes/designing-for-flexibility-around-emmc/ for the details.

Best,

Neeraj

[iguffick]

Hi Neeraj,

Thanks for pointing me at that link. I wouldn’t normally use NC pins. But I like background detail that has been checked to ensure use of pins that are definitely NC. A useful technique to avoid micro-vias or via-in-pad multilayer PCBs.

Regards,
Ian.

[Author]

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