Reason not to use Linux?

I'm looking at OS choices for a 32bit embedded system with USB and
BlueTooth. Right now our system has no OS at all but at some point we'll
want one that makes it easy to extend with various peripherals (802.x, flash
cards, IDE, etc.). The processor will be something like a low-end ARM, PPC,
MIPS or similar (not chosen yet.) I'm looking at OS choices and Linux would
fit the bill and I'm comfortable with it (no hard RT requirement we can't
work around).

What are real alternatives to Linux these days? I'm aware of ecos and
FreeRTOS on the lower end and, of course, there's the commercial vendors
like WindRiver, etc And then there's WinCE. What would be some reasons not
to choose Linux? I'm trying to make sure I don't just pick Linux because
it's been working ok for me.

Thanks,
Andrew


.

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