Overview of Universal Flash Storage Subsystem
Talkat Open Source Summit Europe + Embedded Linux Conference Europe 2019 · on Tuesday, 2019-10-29· at 12:20· Forum 3·
summary
Explains what UFS actually does in Linux and U-Boot and what was implemented: a kernel UFS subsystem and a basic U-Boot stack that enumerates LUNs and exposes them as SCSI block devices, with the host using UPIU/UTP transactions mapped to a table of 32 command descriptors plus PRDTs. Claims full duplex link up to 1.45 Gbps (gear4), typical two-lane operation, and measured up to about 700 MB/s in U-Boot on gear3. Notes ufs-utils can read raw descriptors but lacks friendly descriptor/attribute editors and that descriptor access commands are not yet in U-Boot.
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chapters (24)
- 0:00Intro
- 1:09Managed Flash
- 3:32UFS Features
- 4:16How is UFS better?
- 5:42UFS System Overview
- 7:05UFS Application Layer
- 9:58What is a Logical unit?
- 14:27Logical unit (continued)
- 16:12Application Layer Transaction View
- 17:30UFS Interconnect Layer
- 19:00Simplified UFS Power Modes
- 23:05UFS Transport Layer
- 26:44UTP Read Transaction
- 27:03UTP Write Transaction
- 28:50UFS Host Memory Configuration
- 29:20UFS Task Management
- 30:34UFS Host Controller Interface
- 31:31UFS Descriptors, Flags and Attributes
- 32:21Kernel Implementation
- 34:26Configuring the device from user space
- 35:18ufs-utils
- 36:31U-boot Implementation
- 37:34References
- 38:27UTP Host Memory Configuration
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