SDHCI(4)						   BSD Kernel Interfaces Manual 						  SDHCI(4)

NAME

     sdhci -- PCI SD Host Controller bridge driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   device mmc
	   device mmcsd
	   device sdhci

     Alternatively, to load the driver as a module at boot time, place the following lines in loader.conf(5):

	   mmc_load="YES"
	   mmcsd_load="YES"
	   sdhci_load="YES"

DESCRIPTION

     The sdhci driver supports PCI devices with class 8 and subclass 5 according to SD Host Controller Specification.  Driver supports up to six
     high speed 4bit MMC/SD slots per controller.  Driver attaches mmc bus to the respective slot on card insertion and detaches it on card remov-
     ing.

HARDWARE

     The sdhci driver supports different specification compatible chips. The following chips have been verified to work:

     o	 ENE CB712
     o	 ENE CB714
     o	 RICOH R5C822
     o	 TI PCIXX21/XX11

SEE ALSO

     mmc(4), mmcsd(4)

     SD Specifications, Part 2, SD Host Controller, Simplified Specification.

AUTHORS

     Alexander Motin <mav@FreeBSD.org>.

BUGS

     Many of existing SD controller chips have some nonstandard requirements, proprietary registers and hardware bugs, requiring additional han-
     dling.  ENE chips are handled to work fine, while some revisions of RICOH and TI controllers still don't see cards without some additional
     initialization.

BSD
								 January 14, 2009							       BSD