diff --git a/configs/fo300_defconfig b/configs/fo300_defconfig
index d0728eb..f876dfa 100644
--- a/configs/fo300_defconfig
+++ b/configs/fo300_defconfig
@@ -23,6 +23,7 @@
 CONFIG_CMD_BSP=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
+CONFIG_CMD_DIAG=y
 CONFIG_MAC_PARTITION=y
 CONFIG_ISO_PARTITION=y
 # CONFIG_MMC is not set