diff --git a/configs/rock2_defconfig b/configs/rock2_defconfig
index 746c0bf..24ad3e9 100644
--- a/configs/rock2_defconfig
+++ b/configs/rock2_defconfig
@@ -52,6 +52,7 @@
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_ROCKCHIP=y
 CONFIG_SPI_FLASH=y
+CONFIG_SF_DEFAULT_SPEED=20000000
 CONFIG_DM_ETH=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_GMAC_ROCKCHIP=y