uboot/configs/spear310_usbtty_defconfig
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   1CONFIG_ARM=y
   2CONFIG_TARGET_SPEAR310=y
   3CONFIG_SYS_EXTRA_OPTIONS="spear310,usbtty"
   4CONFIG_BOOTDELAY=-1
   5CONFIG_CMD_I2C=y
   6# CONFIG_CMD_SETEXPR is not set
   7CONFIG_CMD_DHCP=y
   8CONFIG_CMD_MII=y
   9CONFIG_CMD_PING=y
  10CONFIG_SYS_I2C_DW=y
  11CONFIG_NETDEVICES=y
  12CONFIG_ETH_DESIGNWARE=y
  13