When developing an embedded Linux system, there are a large number of choices available, not just in terms of hardware components, but also software. A Linux system is not just about the kernel, but also the user-space software layer that sits above it. Some of the most commonly chosen options are:
- Custom/Hand-built - in some ways this is probably the most common. It allows the most flexibility, and generally results in the tightest integration. It does however require the most developer effort, and the most on-going maintenance.
- OpenEmbedded - this is a source-based Linux distribution system. In some ways it is a meta-distribution, allowing for your own customised distribution to be made. It requires a reasonable amount of initial setup effort, but once configured additional packages can be trivially added. As its named implies, this system is targeted towards embedded systems, and a lot of effort has been made to ensure it is easy to make small installations using it.
- T2 - this is another meta-distribution, although it is not solely targeted towards the embedded market, or even only Linux. As with OpenEmbedded, it allows for a large amount of flexibility
- EmbeddedUbuntu/ Embedded Fedora/EmDebian - Several of the larger Linux distributions have started to target the embedded market. They have the advantage of a huge existing installation and package base, but also have the disadvantage of a large amount of desktop/server baggage that generally isn't required on an embedded system.