Can't mmap the top 1MB of /dev/mem?

Mark S. Mathews mark at
Fri Jun 23 03:15:10 EST 2000

Hi Dan (and all),

I've been playing w/ mmap for flash and nvram access on the rpxlite(MV
derived kernel). One thing I've noticed is that it won't let me mmap the
top 1MB of the address space.  I'm guessing that the region isn't
represented in the MMU stuff or this is a deliberate block in the /dev/mem

I've done a little digging on my own and haven't found the cause.  Can
anyone point me to the right file/function(s)?

Many Thanks,

Mark S. Mathews

AbsoluteValue Systems      Web:
P.O. Box 941149            e-mail: mark at
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294

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