> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Configure device using SD card parameters

The device tree specifies the SD card parameters such as drive strength, maximum speed mode, and HSR settings. The device tree is at `<workspace_root_path>/boot_images/boot/Settings/Soc/Kodiak/Core/Storage/SDCC/sdcc.dtsi`.

The following is an example of the SD card device tree node in UEFI.

| Device tree node/key | Device tree value  | Description                                                                                           |
| -------------------- | ------------------ | ----------------------------------------------------------------------------------------------------- |
| `DriveStrength`      | 0x1FE4             | `DriveStrength` as recommended, sets SDC CLK, CMD, and data drive strengths to 7, 4, 4, respectively. |
| `MaxSpeedMode`       | `SDCC_SDR104_MODE` | Defines maximum speed mode. For SD card, the value is `SDCC_SDR104_MODE`.                             |