Changes to the ARM C Libraries between Release 1.5 and Release 1.6
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The pre-built C Libraries have changed to use LFM and SFM instructions are to
preserve floating point registers across function calls and, thus use of the
new floating point emulator is required.  The library must be rebuilt
(changing FPIS=3 to FPIS=2 in the makedefs file) if the old FPE is to be
used.  For more information about the new FPE see notes/fpe.

The makedefs file allows C libraries to be built with a limit to the number
of registers transferred by any single LDM or STM instruction.  The LDMLIMIT
macro in makedefs can be set to any value from 3 to 16 inclusive.  This can
be used to help reduce interrupt latency.
