Datalight Reliance Edge™ is the only embedded file system designed to capture and preserve decision-quality data with deterministic behavior required by today’s autonomous systems. A transactional file system, Reliance Edge protects critical system and user data from corruption, specifically for systems where power loss may occur.
Reliance Edge works with a broad array of storage media including: eMMC, SD/MMC, NVRAM, USB mass storage and SATA (or PATA) disks. When paired with a flash translation layer flash driver like FlashFX Tera, Reliance Edge delivers the functionality of a complete flash file system. As a small-footprint IoT file system, Reliance Edge builds upon and continues the Reliance file system legacy that is hundreds of millions of devices strong and is supported by Datalight’s award-winning support.
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Feature |
Benefit |
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Transactional design never overwrites live data |
Once the data is written, it is never in an indeterminate state |
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Writes are atomic |
Meta data never points the wrong user data |
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Can be configured to use as little as 4 KB of RAM, 12 KB of code |
Ideal for resource-constrained environments |
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Tree-based metadata |
Mounts quickly and consistently after unexpected shutdown/power loss |
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Works with any block device driver supporting HDD, RAM, USB Mass Storage, SD/MMC, or eMMC |
Allows you to choose the best storage for your design |
| Ships as source code that is MISRA C:2012 compliant | Design standard prevents many bugs; flexible for use case customization |
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MISRA C:2012 Design Assurance Package available to commercial licensees |
Makes certification much easier; deterministic I/O enables planned system design |
| GPL v2 source version on github | Enables easy evaluation and prototyping, along with personal use – more cost effective than creating your own file system |
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Simple Architecture |
Quick and efficient implementation |
Flexible File System Configuration
Reliance Edge provides three main options for file system configuration, detailed below. Each of these thread-safe options is also completely power fail safe, preserving file system structure and user data in the case of a power interruption. Flexible transaction point configuration is available in each case, and key file system operations are deterministic, providing unprecedented predictability.
| Feature |
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| API set | POSIX-like | POSIX-like (not including rename) |
Constrained | ||||||
| Number of files | Variable | Variable | Fixed | ||||||
| Number of volumes | Multiple | Multiple | Multiple | ||||||
| Maximum stack depth | 824 | 744 | 556 | ||||||
| Buffers (minimum) | 12 | 6 | 5 | ||||||
| File references | Names | Names | Numbers | ||||||
| Code size (ROM) | 17.6 KB | 16.7 KB | 10.6 KB | ||||||
| RAM requirement | 8.4 KB | 5.3 KB | 3.9 KB | ||||||
Full POSIX
This option includes path-based file access, file handles and atomic directory operations (including rename).
Small POSIX
This option contains the same POSIX-like APIs as above, but excludes rename.
File System Essentials
The File System Essentials API supports read, write and truncate on files referred to by a number, which is configured at compile time.
Reliance Edge Resources
Datasheet
Developers Guide
Tools
Licensing Options
Kits Available For
The open source version of Reliance Edge is licensed under the terms of GNU General Public License, version 2.