diff --git a/configs/sbc8548_PCI_66_defconfig b/configs/sbc8548_PCI_66_defconfig
index 53f6022..8c8b38d 100644
--- a/configs/sbc8548_PCI_66_defconfig
+++ b/configs/sbc8548_PCI_66_defconfig
@@ -1,4 +1,5 @@
 CONFIG_PPC=y
+# CONFIG_MMC is not set
 CONFIG_MPC85xx=y
 CONFIG_TARGET_SBC8548=y
 CONFIG_OF_BOARD_SETUP=y