For computer science types, Embedded System hierarchy is a tree structure in which the files are always leaf nodes and directories are internal nodes when they contain something and leaf nodes otherwise. The point of making this trip down data-structure memory lane is that the top node in a tree structure is the root node and that, in Linux, the file system mounted at the top node is aptly called the root file system. On your desktop Linux system, you can see what’s mounted as the root file system by doing the following:
Embedded System software engineers also need to be able to fix multifaceted application glitches and be able to produce quality requirement specifications, design documents and test plans. Problem solving and working as a team are also necessary parts of working as a software engineer.
If you’ve never heard of an embedded board system, it’s basically a very limited computer system designed to perform one or two dedicated tasks. Before you ask, it won’t let you go on the internet, and it gets very little use in the home computer market, if by home computer market you’re talking about PCs and Macs.
Rather, Embedded System boards are primarily used in specific devices that need some degree of computing. For example, embedded boards are used in pretty much any dinky little Tiger Electronic Handhold Video games you might remember if you grew up in the 70’s or 80’s. The computing capabilities of an embedded board are lower than that of a home computer, obviously, but the board is usually only given one or two tasks that it can perform like clockwork.
Just typing mount shows all the file systems mounted. Most Linux systems have several file systems mounted, but all the file systems are mounted relative to the root file system. When the Linux kernel boots, it must be able to mount a root file system. During the boot process, Embedded System root file system can be replaced with another, but only one root file system can be mounted at a time. Failure to mount a root file system means that the system can’t find something to run, because a file system is a container for your program and the kernel panics and halts. Depending on the board’s hardware and application requirements, you’re free to select any number of root file system types. A completed device contains a single file system mounted at root but likely uses several different file systems mounted at other directories within the root file system. Only one file system can be mounted at the root (/ directory), but Linux allows for an arbitrary number of file systems to be mounted at other locations in the root file system. For example, a system that uses flash memory for storage mounts a Embedded System-based file system for temporary storage because it’s faster, and flash memory has a much smaller duty cycle than RAM
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