Enable enc28j60 on Raspberry PI

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###Kernel Source Preparation Install libncurses5-dev for make menuconfig

	$ sudo apt-get install libncurses5-dev
	$ sudo apt-get update && sudo apt-get upgrade -y
Get the source code and configure the kernel modules
	git clone --depth 1 https://github.com/raspberrypi/linux.git
	cd linux
	zcat /proc/config.gz >.config
	edit .config and enable

The Configuration image listed as following:

###Wiring Preparation

	ENC - RPi
	===============
	VCC - 3v3
	GND - GND
	CS - CE0 (gpio 8)
	SI - MOSI (gpio 10)
	SCK - SCKL (gpio 11)
	SO - MISO (gpio 9)

Rapsberry PI GPIO Description:

GPIOs:

###Speedup compiling Using cross-compiler:
Resolve the cross-compiler issue:

	[root@XXXyyy lib]# cp libppl.so.13 libppl.so.12
	[root@XXXyyy lib]# pwd
	/usr/lib

The yaourt’s cross-compiler is not ok, so we need to use official cross-compiler, download it from :

	$ git clone git://github.com/raspberrypi/tools.git
	#### Install crosscompiler for RaspberryPI ####
	$ export PATH="/media/x/vmware/rasp/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin:$PATH"

Then you can use cross-compiler to compile your own kernel image and kernel modules.