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sdhci -- PCI SD Host Controller bridge driver
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
Alternatively, to load the driver as a module at boot time, place the
following lines in loader.conf(5):
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.
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
SD Specifications, Part 2, SD Host Controller, Simplified Specification.
Alexander Motin <mav@FreeBSD.org>.
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 don't see cards without some additional initialization.