ETRA SBC/Interfaces and Connectors/micro SD

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Issue Date Notes
2023/08/30 First release

micro SD interface[edit | edit source]

Description[edit | edit source]

The micro SD interface available on the Evaluation Kit at the connector J4.

J4 is a Micro-SD card header. This interface is connected to the SDMMC1 controller of the STM32MP1 CPU.

micro SD connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J18.79 PE6 Data 1
2 J18.81 PC11 Data 3
3 J18.83 PD2 CMD
4 - 3V3_SD +3.3 V
5 J18.85 PC12 Clock
6, 10 - DGND Ground
7 J18.75 PC8 Data 0
8 J18.77 PC9 Data 1
11, 12, 13, 14 - PCB_GND_RNG Shield
9 J18.177 PE9 Card detect

Device mapping[edit | edit source]

The microSD card is mapped to /dev/mmcblk1. The available partitions are available as /dev/mmcblk1p8, /dev/mmcblk1p9, /dev/mmcblk1p10, etc.

Device usage[edit | edit source]

The device can be mounted/accessed as a standard block device in Linux.