SDHCI(4) FreeBSD 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 removing.
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 RICOH R5CE823
o TI PCIXX21/XX11/XX12
SEE ALSO
mmc(4), mmcsd(4)
SD Specifications, Part 2, SD Host Controller, Simplified Specification.
AUTHORS
Alexander Motin <
[email protected]>
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.
FreeBSD 14.1-RELEASE-p8 August 25, 2020 FreeBSD 14.1-RELEASE-p8