---
name: "dwmshc"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/dwmshc"
---

# dwmshc(4)

Synopsys DesignWare Mobile Storage Host Controller

## NAME

**dwmshc** – Synopsys DesignWare Mobile Storage Host Controller

## SYNOPSIS

**dwmshc\* at fdt?** **sdmmc\* at dwmshc?**

## DESCRIPTION

The **dwmshc** driver provides support for the Synopsys DesignWare Mobile Storage Host Controller core. This core is used on the Rockchip RK3528, RK3566/RK3568 and RK3588 SoCs as the eMMC controller.

The Synopsys DesignWare Mobile Storage Host Controller core implements the SD Host Controller Standard Simplified Specification, but requires non-standard support for high clock rates.

The [sdmmc(4)](/sdmmc/4.md) subsystem performs SD/MMC transactions to communicate with the MMC/SD/SDIO devices connected to the controller.

## SEE ALSO

[intro(4)](/intro/4.md), [sdhc(4)](/sdhc/4.md), [sdmmc(4)](/sdmmc/4.md)

## HISTORY

The **dwmshc** driver first appeared in OpenBSD 7.4.