This driver supports NE2000 compatible cards (those based on DP8390,
  DP83902 and similar). It can be used with PCMCIA/CF cards provided
  that the CCR is correctly initialized.
  
  The code is based on sources from the Linux kernel (pcnet_cs.c,
  8390.h) and eCOS(if_dp83902a.c, if_dp83902a.h). Both of these 2
  wonderful world are GPL, so this is, of course, GPL.
  
  I developed and tested this driver on a custom PXA255 based system and
  with a billionton CF network card connected to the PCMCIA interface of
  the micro (have a look at README.PXA_CF for the support of this port).
  
  The options you have to specify in the config file are (with the
  value for my board as an example):
  
  #define CONFIG_DRIVER_NE2000
  
  - Enables the driver
  
  #define CONFIG_DRIVER_NE2000_BASE (0x20000000+0x300)
  
  - Address where the board is mapped
  
  #define CONFIG_DRIVER_NE2000_CCR (0x28000000+0x3f8)
  
  - Address of the CCR (card configuration register). It could be found
  by enabling DEBUG in cmd_pcmcia.c. If this is not defined nothing is
  done as far as PCMCIA support is concerned.
  
  #define CONFIG_DRIVER_NE2000_VAL (0x20)
  
  - The value to be written in the CCR. It selects among different I/O
  spaces that could be used by the card.
  
  
  Enjoy!
  
  Christian Pellegrin <chri@ascensit.com>