These distribution-building tools exist due to a catalyst such as supporting a particular usage scenario (for example, as small as possible or rescue disks) or a certain hardware platform (such as a cell phone). These aren’t mutually exclusive concepts, because cell phone Linux distributions are frequently small— resource consumption is very important for that hardware platform. The concept of a distribution builder isn’t limited to embedded Linux; the same concept exists for desktop Linux systems, the output being an ISO and collection of packages (think RPMs or debs) In the case of hardware platform–specific distribution builders, the vendor isn’t interested in selling the Linux distribution, but rather sees the Linux distribution as an enabler for hardware sales and also as a way to potentially harm the revenue stream of a competitor that sells a Linux distribution as an add-on product. Linux is a way to help sell hardware, plain and simple. As time progresses, the distributionbuilder project begins to support a larger variety of hardware, because adapting an existing code base makes for smart engineering. Several embedded distributions are package system based. The distributions are embedded in terms of the packages, target platform, and size that use an underlying packaging technology to achieve this aim. Although some projects use the same packaging system but have a focus on a particular technology or hardware, these projects are focused on the packaging system.
Source of Information : Pro Linux Embedded Systems
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