diff --git a/configs/sfr_nb4-ser_ram_defconfig b/configs/sfr_nb4-ser_ram_defconfig
index 6f26188..df008b7 100644
--- a/configs/sfr_nb4-ser_ram_defconfig
+++ b/configs/sfr_nb4-ser_ram_defconfig
@@ -71,3 +71,5 @@
 CONFIG_USB_EHCI_GENERIC=y
 CONFIG_USB_OHCI_HCD=y
 CONFIG_USB_OHCI_GENERIC=y
+CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS=2
+CONFIG_SYS_OHCI_SWAP_REG_ACCESS=y