This driver supports Designware Ethernet Controller provided by Synopsis. The driver is enabled by CONFIG_DESIGNWARE_ETH. The driver has been developed and tested on SPEAr platforms. By default, the MDIO interface works at 100/Full. #defining the below options in board configuration file changes this behavior. Call an subroutine from respective board/.../board.c designware_initialize(u32 id, ulong base_addr, u32 phy_addr); The various options suported by the driver are 1. CONFIG_DW_ALTDESCRIPTOR Define this to use the Alternate/Enhanced Descriptor configurations. 1. CONFIG_DW_AUTONEG Define this to autonegotiate with the host before proceeding with mac level configuration. This obviates the definitions of CONFIG_DW_SPEED10M and CONFIG_DW_DUPLEXHALF. 2. CONFIG_DW_SPEED10M Define this to change the default behavior from 100Mbps to 10Mbps. 3. CONFIG_DW_DUPLEXHALF Define this to change the default behavior from Full Duplex to Half. 4. CONFIG_DW_SEARCH_PHY Define this to search the phy address. This would overwrite the value passed as 3rd arg from designware_initialize routine.