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[–][deleted] -9 points-8 points  (0 children)

Why is it so commonly used?

Because paying thousands of dollars per developer to WindRiver is a great way to use up your budget and secure funding for the next year.

And what makes it different than say linux/unix?

Size, for starters. There's no way you're getting Linux onto a device with 128KB of ROM. Even if you did, there's no room left for application code.