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Subject2.5.23+ bootflag.c triggers __iounmap: bad address
When booting 2.5.23/.24, my test boxes generate the following:

(an ASUS P4T-E which has SBF)
__iounmap: bad address d0802100
SBF: Simple Boot Flag extension found and enabled.
__iounmap: bad address d0805040
__iounmap: bad address d0808080
SBF: Setting boot flags 0x1

(an old Intel AL440LX which doesn't have SBF)
__iounmap: bad address c4800009
__iounmap: bad address c4804b8c
__iounmap: bad address c4802009

These warnings/errors are new since 2.5.23, which makes me
suspect something's wrong in the 2.5.23 iounmap changes.

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