diff --git a/configs/koelsch_defconfig b/configs/koelsch_defconfig
index edb7933..a74a1ee 100644
--- a/configs/koelsch_defconfig
+++ b/configs/koelsch_defconfig
@@ -71,6 +71,7 @@
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_MTD=y
+CONFIG_BITBANGMII=y
 CONFIG_PHY_MICREL=y
 CONFIG_PHY_MICREL_KSZ8XXX=y
 CONFIG_DM_ETH=y