Network drivers are provided as examples only, and do not form part of the
FreeRTOS+TCP stack itself.  They:

	+ May be based on driver code provided by the chip vendors,
	+ May not have been tested in all possible configurations,
	+ Will not necessarily be optimised.
	+ May have a dependency on a particular PHY part number.
	+ May not necessarily comply with any particular coding standard.
	+ May have dependencies on chip company libraries.
	+ May include other hardware board dependencies.