Generic upgrade infrastructure for embedded systems

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Generic upgrade infrastructure for embedded systems.

Summary
Generic upgrade infrastructure for embedded systems.
Proposer
Atilla Filiz, Arnout Vandecappelle

Description

Experience as an embedded software contractor shows that most clients need a means to upgrade their devices in the field. Often these solutions are ad-hoc, and need to be redone for each project, although requirements are similar.

A collection of scripts and permissively licensed source code will help device manufacturers to rapidly and safely implement a secure, fail-safe, atomic upgrade system for their devices.

The infrastructure will allow an embedded system to have one backup firmware, and one or two main firmware partitions. When a new firmware is downloaded and written as a main firmware, the upgrade system makes sure the device can boot. If the upgrade fails due to power, file corruption or other factors, the system recovers by booting the previous firmware or a failsafe firmware to retry upgrading.

Having this feature will prevent reinventing the wheel for each new product when it comes to upgrading.

Related work

  • FOSDEM/ELC-E Presentation:

http://mind.be/content/Presentation_Upgrade-without-Bricking.pdf

  • Generic project repository with detailed documentation:

https://gitorious.org/gupies

  • CGI based project repository:

https://gitorious.org/embedded-linux-firmware-upgrade-tool

  • Linupdate + barebox
    • Jean-Christophe PLAGNIOL-VILLARD says that he and others are currently working on a similar project with a full c application under GPLv2 called linupdate + barebox. It is intended to will support secure boot platforms such as STB

Scope

A basic system can be implemented and unit tested in six person-weeks. This includes support for a single bootloader (U-Boot), for overwriting an MTD partition and a UBI volume. This also includes a wire format for the upgrade image and documentation for the platform-specific part, needed per project. Additional partition types (e.g. mbr) or bootloaders (e.g. barebox) require additional effort.

Contractor Candidates

Arnout Vandecappelle (Essensium/Mind)

Comments

Thomas Petazzoni, of Free Electrons, writes:

Interesting, thanks. I was also pondering proposing a project around
system upgrade for embedded systems, but I was thinking of a different
approach. Rather than implementing yet another tool/infrastructure, I
wanted to propose a project that consists in writing a
document/white-paper that details the different system upgrades
solutions that one can use (for example: dual kernel+rootfs partitions,
or minimal kernel+initramfs, updating from the bootloader or from
Linux, full system update vs. package based updates), with details on
their respective advantages/drawbacks, and how to implement them.

I believe the problem in this space is not the much the solutions
themselves, but rather the lack of a central document to help people
make their mind between the different available solutions, and to help
them find the relevant existing tools / bits of code. I don't think
it's a problem that can be solved in a one-solution-fits-all way,
depending on the context (size of flash, type of embedded system,
origin of the firmware upgrades, etc.) there will necessarily be
different solutions.