CONFIG_PACKING

This option provides the packing() helper function, which permits
converting bitfields between a CPU-usable representation and a
memory representation that can have any combination of these quirks:
  - Is little endian (bytes are reversed within a 32-bit group)
  - The least-significant 32-bit word comes first (within a 64-bit
    group)
  - The most significant bit of a byte is at its right (bit 0 of a
    register description is numerically 2^7).
Drivers may use these helpers to match the bit indices as described
in the data sheets of the peripherals they are in control of.

When in doubt, say N.


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