diff --git a/external/config/bootscripts/boot-rockchip64.cmd b/external/config/bootscripts/boot-rockchip64.cmd
index c2dd64e..8f31242 100644
--- a/external/config/bootscripts/boot-rockchip64.cmd
+++ b/external/config/bootscripts/boot-rockchip64.cmd
@@ -67,6 +67,12 @@ else
 		source ${load_addr}
 	fi
 fi
+
+if test "${ethernet_phy}" = "rtl8211f"; then
+        fdt set /ethernet@ff540000 tx_delay <0x24>
+        fdt set /ethernet@ff540000 rx_delay <0x18>
+fi
+
 booti ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
 
 # Recompile with: