--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -171,6 +171,7 @@ dtb-$(CONFIG_ROCKCHIP_RK3399) += \
 dtb-$(CONFIG_ROCKCHIP_RK3568) += \
 	rk3568-bpi-r2-pro.dtb \
 	rk3568-evb.dtb \
+	rk3568-r66s.dtb \
 	rk3568-opc-h68k.dtb \
 	rk3568-mrkaio-m68s.dtb \
 	rk3568-nanopi-r5s.dtb \
--- /dev/null
+++ b/arch/arm/dts/rk3568-r66s-u-boot.dtsi
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+#include "rk3568-u-boot.dtsi"
+
+/ {
+	chosen {
+		stdout-path = &uart2;
+		u-boot,spl-boot-order = "same-as-spl", &sdmmc0, &sdhci;
+	};
+};
+
+&sdmmc0 {
+	bus-width = <4>;
+	u-boot,spl-fifo-mode;
+};
+
+&uart2 {
+	u-boot,dm-spl;
+	clock-frequency = <24000000>;
+	status = "okay";
+};
--- /dev/null
+++ b/arch/arm/dts/rk3568-r66s.dts
@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+#include "rk3568-evb.dts"
--- /dev/null
+++ b/configs/r66s-rk3568_defconfig
@@ -0,0 +1,98 @@
+CONFIG_ARM=y
+CONFIG_SKIP_LOWLEVEL_INIT=y
+CONFIG_ARCH_ROCKCHIP=y
+CONFIG_SYS_TEXT_BASE=0x00a00000
+CONFIG_SPL_LIBCOMMON_SUPPORT=y
+CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_NR_DRAM_BANKS=2
+CONFIG_DEFAULT_DEVICE_TREE="rk3568-r66s"
+CONFIG_ROCKCHIP_RK3568=y
+CONFIG_SPL_ROCKCHIP_BACK_TO_BROM=y
+CONFIG_SPL_ROCKCHIP_COMMON_BOARD=y
+CONFIG_SPL_MMC=y
+CONFIG_SPL_SERIAL=y
+CONFIG_SPL_STACK_R_ADDR=0x600000
+CONFIG_TARGET_EVB_RK3568=y
+CONFIG_DEBUG_UART_BASE=0xFE660000
+CONFIG_DEBUG_UART_CLOCK=24000000
+CONFIG_DEBUG_UART=y
+CONFIG_SYS_LOAD_ADDR=0xc00800
+CONFIG_API=y
+CONFIG_FIT=y
+CONFIG_FIT_VERBOSE=y
+CONFIG_SPL_LOAD_FIT=y
+CONFIG_OF_SYSTEM_SETUP=y
+CONFIG_DEFAULT_FDT_FILE="rockchip/rk3568-r66s.dtb"
+# CONFIG_SYS_DEVICE_NULLDEV is not set
+CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS=2
+# CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_DISPLAY_BOARDINFO_LATE=y
+# CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
+CONFIG_SPL_STACK_R=y
+CONFIG_SPL_SEPARATE_BSS=y
+CONFIG_SPL_ATF=y
+CONFIG_SPL_ATF_LOAD_IMAGE_V2=y
+CONFIG_CMD_BIND=y
+CONFIG_CMD_CLK=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_PMIC=y
+CONFIG_CMD_REGULATOR=y
+# CONFIG_SPL_DOS_PARTITION is not set
+CONFIG_SPL_OF_CONTROL=y
+CONFIG_OF_LIVE=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_SPL_DM_WARN=y
+CONFIG_SPL_REGMAP=y
+CONFIG_SPL_SYSCON=y
+CONFIG_SPL_CLK=y
+CONFIG_ROCKCHIP_GPIO=y
+CONFIG_ROCKCHIP_GPIO_V2=y
+CONFIG_SYS_I2C_ROCKCHIP=y
+CONFIG_MISC=y
+CONFIG_MMC_HS200_SUPPORT=y
+CONFIG_SPL_MMC_HS200_SUPPORT=y
+CONFIG_MMC_DW=y
+CONFIG_MMC_DW_ROCKCHIP=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_SDMA=y
+CONFIG_MMC_SDHCI_ROCKCHIP=y
+CONFIG_DM_ETH=y
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_GMAC_ROCKCHIP=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_DM_PMIC=y
+CONFIG_PMIC_RK8XX=y
+CONFIG_SPL_PMIC_RK8XX=y
+CONFIG_REGULATOR_PWM=y
+CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_SPL_DM_REGULATOR_FIXED=y
+CONFIG_DM_REGULATOR_GPIO=y
+CONFIG_REGULATOR_RK8XX=y
+CONFIG_PWM_ROCKCHIP=y
+CONFIG_SPL_RAM=y
+CONFIG_DM_RESET=y
+CONFIG_BAUDRATE=1500000
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYSRESET=y
+CONFIG_SYSRESET_PSCI=y
+CONFIG_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_DWC3=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_EHCI_GENERIC=y
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_OHCI_GENERIC=y
+CONFIG_USB_DWC3=y
+CONFIG_USB_DWC3_GENERIC=y
+CONFIG_ROCKCHIP_USB2_PHY=y
+CONFIG_USB_KEYBOARD=y
+CONFIG_USB_HOST_ETHER=y
+CONFIG_USB_ETHER_LAN75XX=y
+CONFIG_USB_ETHER_LAN78XX=y
+CONFIG_USB_ETHER_SMSC95XX=y
+CONFIG_ERRNO_STR=y