> check_signature() needs readb() but with some setups (s390, m68k allmodconfig)
This completely bogus. readb() should be present on M68K, fix the
platform to implement readb() for MMIO, even if your MMIO readb is a
moveb instruction.
check_signature is relevant for anything with MMIO space (for example you
can legitimately want to check_signature a MAC68K Nubus ROM).
S/390 is a bit of a special case as no S/390 usage of check_signature
appears sane but equally it isn't used so you can stub it out.
Alan
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