sda - SD/MMC architecture
The sda module provides support services for Secure Digital (SD) and MultiMediaCard (MMC) slot and card device drivers.
64-bit ELF kernel module (x86)
See attributes(7) for a description of the following attributes:
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scsa2usb(4D), sd(4D), sdcard(4D), sdhost(4D), attributes(7), cfgadm_sdcard(8)
The sda module provides support only for SD/MMC devices that are connected via a supported slot driver. Notably, slots that are on USB busses are normally treated as USB mass storage devices and are serviced by the scsa2usb(4D) driver.