diff --git a/target/linux/ppc40x/config-3.6 b/target/linux/ppc40x/config-3.6
index 784907d49..978a05495 100644
--- a/target/linux/ppc40x/config-3.6
+++ b/target/linux/ppc40x/config-3.6
@@ -98,7 +98,7 @@ CONFIG_IBM_EMAC_RX_COPY_THRESHOLD=256
 CONFIG_IBM_EMAC_RX_SKB_HEADROOM=0
 CONFIG_IBM_EMAC_TXB=256
 CONFIG_INITRAMFS_SOURCE=""
-CONFIG_IOMMU_HELPER=y
+# CONFIG_IOMMU_HELPER is not set
 # CONFIG_IPIC is not set
 CONFIG_IRQ_DOMAIN=y
 CONFIG_IRQ_FORCED_THREADING=y
@@ -204,7 +204,7 @@ CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_SLAB is not set
 CONFIG_SLUB=y
 CONFIG_SPARSE_IRQ=y
-CONFIG_SWIOTLB=y
+# CONFIG_SWIOTLB is not set
 CONFIG_TASK_SIZE=0xc0000000
 CONFIG_USB=m
 CONFIG_USB_ARCH_HAS_XHCI=y
diff --git a/target/linux/ppc44x/config-3.6 b/target/linux/ppc44x/config-3.6
index 71e1362c6..44b02b3c3 100644
--- a/target/linux/ppc44x/config-3.6
+++ b/target/linux/ppc44x/config-3.6
@@ -107,7 +107,7 @@ CONFIG_IBM_EMAC_TXB=128
 CONFIG_IBM_EMAC_ZMII=y
 # CONFIG_ICON is not set
 CONFIG_INITRAMFS_SOURCE=""
-CONFIG_IOMMU_HELPER=y
+# CONFIG_IOMMU_HELPER is not set
 # CONFIG_IPIC is not set
 CONFIG_IRQ_DOMAIN=y
 CONFIG_IRQ_FORCED_THREADING=y
@@ -214,7 +214,7 @@ CONFIG_SERIAL_8250_FSL=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_SPARSE_IRQ=y
-CONFIG_SWIOTLB=y
+# CONFIG_SWIOTLB is not set
 CONFIG_TAISHAN=y
 CONFIG_TASK_SIZE=0xc0000000
 CONFIG_USB_ARCH_HAS_XHCI=y