Description
The package provides the installation files for BayHubTech/O2Micro Integrated MMC/SD Controller Driver version 2.2.2.1080. If the driver is already installed on your system, updating (overwrite-installing) may fix various issues, add new functions, or just upgrade to the available version. Check our new training course. And Creative Commons CC-BY-SA. Lecture and lab materials.
This package provides a disk device driver for two commercial flash memory card standards: MultiMedia Cards (MMC), and Secure Digital (SD) cards, including the high-capacity SDHC variant. The package also provides some (non-disk) basic SD I/O (SDIO) card support.

The MMC card implementation is intended to allow operation with memory cards compliant with the MultiMediaCard Standard version 2, as published by the MultiMediaCard Association. The SD implementation is intended to allow operation with cards compliant with the SD Physical Layer Specification version 2, as published by the SD Card Association.
This package evolved from an MMC-only implementation and as such the naming of certain aspects such as the CDL package name reflects that heritage. Any identifiers which reference MMC usually refer to either MMC or SD cards unless otherwise noted. Similarly, the package provides (limited) support for SDIO cards which do NOT require the presence of the CYGPKG_IO_DISK
infrastructure and do not present as disk (memory) devices.
An MMC/SD card provides non-volatile storage in a small footprint (24mm * 32mm * 1.4mm), and weighing less than 2 grams. Typical card sizes are 128MB to 2GB, with an upper limit of 4GB for MMC and SDv1; and 32GB for SDHC cards in SDv2. It should be noted that these sizes are measured in millions of bytes, not 2^20. This driver provides support for 4GB MMC and SDv1 cards, although in practice, the FAT16 filesystem layout on such cards is unusual and may not be supported by a filesystem implementation using this driver. This problem should not occur with cards of size 2GB and less, or with SDHC cards.
At the hardware level there are two ways of accessing an MMC card. The first it to use a custom interface frequently known as either an an MCI (Multimedia Card Interface, although this allows supports for SD as well) or an MMC/SD bus. The second interface is via connection to an SPI bus. A card will detect the interface in use at run-time. The custom MCI interface allows for better performance but requires additional hardware. SPI peripheral support is more readily available on many existing CPUs. At this time, the SPI bus mode of interface does not support SD or SDIO cards in this driver.
Mmc.c - Drivers/mmc/core/mmc.c - Linux Source Code (v4.14.212 ..
Theoretically an MMC/SD memory card can be used with any file system. In practice all cards are formatted for PC compatibility, with a partition table in the first block and a single FAT file system on the rest of the card. The SPI mode driver always checks the format of the MMC card and will only allow access to a card if it is formatted this way. The MCI card bus driver can adapt to a card with no partition table as long as it contains a FAT filesystem starting from the first block. This non-standard format can sometimes be created by Windows when reformatting a corrupted card. This ability is controlled by the CYGSEM_IO_DISK_DETECT_FAT_BOOT
CDL configuration option in the generic disk device driver package CYGPKG_IO_DISK
.
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Drivers/mmc/core/sdio Irq.c
