This is actually one of my favorite interview questions. We work almost exclusively with embedded systems that do not have any form of virtual memory. There are large portions of our code base that deal with physical memory fragmentation. If someone claims to have extensive "embedded" development experience, and can't describe the physical <-> virtual memory relation, there's a little diggin to do in the rest of the interview. On the other hand, if someone doesn't claim to be an embedded developer or or kernel hacker and can still answer the question, that's big bonus points.
I should note thought, that most of the newer boards support a full Linux kernel. With chipsets sporting real MMUs and memory prices so cheap now days, it's almost a non issue.
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