---
name: "sximmc"
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/sximmc"
---

# sximmc(4)

SD/MMC controller

## NAME

**sximmc** – SD/MMC controller

## SYNOPSIS

**sximmc\* at fdt?** **sdmmc\* at sximmc?**

## DESCRIPTION

The **sximmc** driver provides support for the MMC/SD/SDIO controller integrated on Allwinner A1X/A20 SoCs.

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

## SEE ALSO

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

## HISTORY

The **sximmc** driver first appeared in OpenBSD 6.1.

## AUTHORS

The **sximmc** driver was written by Jared D. McNeill for NetBSD and ported to OpenBSD by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.