---
name: "sdhc"
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/sdhc"
---

# sdhc(4)

SD Host Controller

## NAME

**sdhc** – SD Host Controller

## SYNOPSIS

**sdhc\* at acpi?** **sdhc\* at fdt?** **sdhc\* at pci?** **sdmmc\* at sdhc?**

## DESCRIPTION

The **sdhc** driver provides support for SD controllers following the SD Host Controller Standard Simplified Specification.

The [sdmmc(4)](/sdmmc/4.md) subsystem performs SD/MMC transactions to communicate with whatever MMC, SD, SDHC, or SDIO devices are inserted into the SD slot.

## SEE ALSO

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

## HISTORY

The **sdhc** driver first appeared in OpenBSD 4.0.

## AUTHORS

The **sdhc** driver was written by Uwe Stuehler ⟨*uwe@openbsd.org*⟩.