Necessity of eMMC

[tatsuya]

Hi team,

I am developing the board referring to the "STM32MP157 EVAL"(MB1263-C04 Board schematic).

https://www.st.com/en/evaluation-tools/stm32mp157f-ev1.html#cad-resources

STM32MP157 EVAL has an SD card slot and eMMC as storage media.

I think the sample Linux environment (demo environment) is stored in the SD card, but is eMMC necessary?

(If an SD card is installed, is it not necessary to install eMMC?)

Best regard,

[Erwan SZYMANSKI · Accepted solution]

Hello @tatsuya​,

The eval board is here to present the different features that the stm32mp15 can offer. As you well said, we have both SDcard and eMMC available on eval board. If you want to use SDcard as a boot method, so no eMMC is not used at all. We just offer both possibilities for customer who would like to test their preferred method.

As you mentioned it, the default method explained in the different wiki pages will use SDcard.

I hope that this information will help you.

Kind regards,

Erwan.

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[PatrickF]

Hi @tatsuya​ 

I confirm @Erwan SZYMANSKI​ statements.

I want to mention that SD-Card is rarely the only boot media in an real consumer or industrial product.

As removable and replaceable, SD-Card is more prone to long term issues (Card reliability, end-user mistakes, connector failure, dust, etc..)

Embedded Flash (eMMC, parallel NAND, Serial-NOR, Serial-NAND) are usually preferred.

Anyway, an SD-Card-only product is fine for development or demonstration products (like STM32MP157F-DK2 or RaspberryPi)

Regards.