zynq7000: add SD card storage driver #433
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add library for MBR header structure RTOS-630
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Adds a storage driver for SD memory cards. Data can be read through a block device or a JFFS2 partition can be mounted through an emulated MTD character device.
Description
The driver uses the SD Host Controller built into the Zynq 7000 platform to communicate with the SD card. Accesses to the card (for both block and MTD device files) are passed through
libcache. Partitions are dectected automatically upon card insertion using MBR partition scheme (typical on SD cards). Separate device files are created for each partition. Card removal results in partitions being unmounted and device files being removed. No "safe eject" functionality has been implemented yet.The MTD device is described as "emulated" as there is no way to implement a fully featured MTD driver for an SD card. Driver supports JFFS2 and ext2 filesystems. The driver also allows root filesystem to be mounted during startup.
Driver supports SD and SDHC cards of any size (up to 2 TB permitted by the standard), but due to limitations of
libstorageandlibcacheon this platform only the first 4 GB of the card are addressable. Any partition on the card that starts or ends beyond 4 GB will not work. This can be remedied by partitioning the card on a host PC to ensure all partitions fit within the first 4 GB of the card's capacity.Motivation and Context
Types of changes
How Has This Been Tested?
The driver was tested on a variety of microSD cards ranging in size from 256 MB to 16 GB and implementing SD Specification v1.01, v1.1 and v2.0.
Checklist:
Special treatment