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SDHCI(4) 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 ac- cording 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: • 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 require- ments, 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 14.3 August 25, 2020 SDHCI(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | SEE ALSO | AUTHORS | BUGS
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