1.\" $OpenBSD: sdhc.4,v 1.7 2020/08/06 10:10:16 jsg Exp $ 2.\" 3.\" Theo de Raadt, 2006. Public Domain. 4.\" 5.Dd $Mdocdate: August 6 2020 $ 6.Dt SDHC 4 7.Os 8.Sh NAME 9.Nm sdhc 10.Nd SD Host Controller 11.Sh SYNOPSIS 12.Cd "sdhc* at acpi?" 13.Cd "sdhc* at fdt?" 14.Cd "sdhc* at pci?" 15.Cd "sdmmc* at sdhc?" 16.Sh DESCRIPTION 17The 18.Nm 19driver provides support for SD controllers following the 20SD Host Controller Standard Simplified Specification. 21.Pp 22The 23.Xr sdmmc 4 24subsystem performs SD/MMC transactions to communicate with 25whatever MMC, SD, SDHC, or SDIO devices are inserted into the SD slot. 26.Sh SEE ALSO 27.Xr intro 4 , 28.Xr sdmmc 4 29.Sh HISTORY 30The 31.Nm 32driver first appeared in 33.Ox 4.0 . 34.Sh AUTHORS 35.An -nosplit 36The 37.Nm 38driver was written by 39.An Uwe Stuehler Aq Mt uwe@openbsd.org . 40