Bureaucrats, dave_user, Administrators
4,650
edits
Changes
→History
|2.0.0
|January 2022
|Added the section sections* "Embedded Linux systems with eMMC or SD cards"* "Example: embedded Linux system equipped with SanDisk SDINBDG4-8G-XI1 eMMC and <code>ext4</code> file system"
|}
Another typical use case refers to eMMC's and SD cards. As explained [http://www.linux-mtd.infradead.org/doc/ubifs.html#L_raw_vs_ftl here], these components are FTL devices, where FTL stands for ''Flash Translation Layer''. This layer ''emulates a block device on top of flash hardware''. Therefore, these storage devices are used in tandem with file systems such as [https://en.wikipedia.org/wiki/Ext4 ext4] and [https://en.wikipedia.org/wiki/File_Allocation_Table#FAT32 FAT32]. Besides a raw NAND flash memory, eMMC's and SD cards integrate a microcontroller implementing the FTL and other important tasks as detailed in the rest of the document. All things considered, eMMC's and SD cards appear therefore to the host as managed-NAND block devices.
The sections related to eMMC-based use cases are the result of a joint effort between [https://www.westerndigital.com/ Western Digital] (which purchased [https://en.wikipedia.org/wiki/SanDisk SanDisk] in 2016), Lauterbach Italy, and DAVE Embedded Systems.Parts of such sections are retrieved from the White Paper ''TRACE32 log method for analysing accesses to an eMMC device'' by Lauterbach, which is freely available for download [https://www.lauterbach.com/publications/trace32_log_method_for_analysing_accesses_to_an_emmc_device.pdf here].
[[File:Lauterbach-logo.png|center|thumb|308x308px]]
[[File:WesterDigital-logo.png|center|thumb|180x180px]]
=Wear-out=
