ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/micro SD
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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.
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.
