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 removing.

HARDWARE

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

       •   ENE CB712
       •   ENE CB714
       •   RICOH R5C822
       •   RICOH R5CE823
       •   TI PCIXX21/XX11/XX12

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 handling.  ENE chips are handled to work fine, while some revisions
       of RICOH and TI controllers still do not see cards without some additional initialization.

Debian                                           August 25, 2020                                        SDHCI(4)