howto write protect flash space?

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Hi,
    I'm new to this list, so forgive me if this has been asked alot in the
past.
I am running the 2.4.19 kernel on an ixp1200 and want to be able to write
protect a particular block in the flash.  I think that I need to use mmap(),
but I'm not certain.
    Does anyone have an example of how this would be used?



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