diff --git a/conf/machine/include/nanopi-m4.inc b/conf/machine/include/nanopi-m4.inc
index ac6479d..3870b51 100644
--- a/conf/machine/include/nanopi-m4.inc
+++ b/conf/machine/include/nanopi-m4.inc
@@ -7,5 +7,3 @@ MACHINE_FEATURES += "usbhost serial"
 
 KMACHINE = "nanopi-m4"
 KERNEL_DEVICETREE = "rockchip/rk3399-nanopi-m4.dtb"
-
-RK_BOOT_DEVICE = "mmcblk1"
diff --git a/conf/machine/include/rock-pi-4.inc b/conf/machine/include/rock-pi-4.inc
index b6fb3dd..0a86846 100644
--- a/conf/machine/include/rock-pi-4.inc
+++ b/conf/machine/include/rock-pi-4.inc
@@ -3,6 +3,4 @@ MACHINEOVERRIDES =. "rock-pi-4:"
 
 require conf/machine/include/rk3399.inc
 
-RK_BOOT_DEVICE = "mmcblk1"
-
 MACHINE_EXTRA_RRECOMMENDS += "kernel-modules"
diff --git a/conf/machine/include/rockchip-wic.inc b/conf/machine/include/rockchip-wic.inc
index b5939f7..15010a0 100644
--- a/conf/machine/include/rockchip-wic.inc
+++ b/conf/machine/include/rockchip-wic.inc
@@ -20,11 +20,7 @@ IMAGE_BOOT_FILES = " \
 RK_CONSOLE_BAUD ?= "${@d.getVar('SERIAL_CONSOLES').split(';')[0]}"
 RK_CONSOLE_DEVICE ?= "${@d.getVar('SERIAL_CONSOLES').split(';')[1].split()[0]}"
 
-# boot device (sd-card/emmc)
-RK_BOOT_DEVICE ??= "mmcblk0"
-
 WICVARS:append = " \
-	RK_BOOT_DEVICE \
 	RK_CONSOLE_BAUD \
 	RK_CONSOLE_DEVICE \
 	SPL_BINARY \
diff --git a/conf/machine/rock64.conf b/conf/machine/rock64.conf
index 21755a8..fa75a51 100644
--- a/conf/machine/rock64.conf
+++ b/conf/machine/rock64.conf
@@ -12,7 +12,4 @@ MACHINE_FEATURES += "usbhost serial"
 UBOOT_MACHINE = "rock64-rk3328_defconfig"
 KERNEL_DEVICETREE = "rockchip/rk3328-rock64.dtb"
 
-# set to mmcblk0 for booting from optional eMMC
-RK_BOOT_DEVICE ?= "mmcblk1"
-
 KBUILD_DEFCONFIG = "defconfig"
diff --git a/conf/machine/tinker-board-s.conf b/conf/machine/tinker-board-s.conf
index 9f44f2f..870b9bc 100644
--- a/conf/machine/tinker-board-s.conf
+++ b/conf/machine/tinker-board-s.conf
@@ -9,5 +9,3 @@ require conf/machine/include/tinker.inc
 
 KERNEL_DEVICETREE = "rk3288-tinker-s.dtb"
 UBOOT_MACHINE = "tinker-s-rk3288_defconfig"
-
-RK_BOOT_DEVICE ?= "mmcblk1"
diff --git a/conf/machine/vyasa-rk3288.conf b/conf/machine/vyasa-rk3288.conf
index 9ad1ed4..5b44257 100644
--- a/conf/machine/vyasa-rk3288.conf
+++ b/conf/machine/vyasa-rk3288.conf
@@ -13,5 +13,3 @@ KERNEL_DEVICETREE = "rk3288-vyasa.dtb"
 KERNEL_EXTRA_ARGS += "LOADADDR=0x02000000"
 
 UBOOT_MACHINE = "vyasa-rk3288_defconfig"
-
-RK_BOOT_DEVICE = "mmcblk2"
diff --git a/wic/rockchip.wks b/wic/rockchip.wks
index eedae0d..5ee276b 100644
--- a/wic/rockchip.wks
+++ b/wic/rockchip.wks
@@ -15,12 +15,12 @@
 #   boot        32768           229376
 #   root        262144          -           (suggested)
 
-part loader1    --offset 32     --fixed-size 4000K            --ondisk ${RK_BOOT_DEVICE} --source rawcopy                                      --sourceparams="file=${SPL_BINARY}"
-part reserved1  --offset 4032   --fixed-size 64K              --ondisk ${RK_BOOT_DEVICE}
-part reserved2  --offset 4096   --fixed-size 4096K            --ondisk ${RK_BOOT_DEVICE}
-part loader2    --offset 8192   --fixed-size 4096K            --ondisk ${RK_BOOT_DEVICE} --source rawcopy                                      --sourceparams="file=u-boot.${UBOOT_SUFFIX}"
-part atf        --offset 12288  --fixed-size 4096K            --ondisk ${RK_BOOT_DEVICE}
-part /boot      --offset 16384  --size       114688K --active --ondisk ${RK_BOOT_DEVICE} --source bootimg-partition --fstype=vfat --label boot --sourceparams="loader=u-boot"
-part /                                                        --ondisk ${RK_BOOT_DEVICE} --source rootfs            --fstype=ext4 --label root
+part loader1    --offset 32     --fixed-size 4000K            --source rawcopy                                                 --sourceparams="file=${SPL_BINARY}"
+part reserved1  --offset 4032   --fixed-size 64K
+part reserved2  --offset 4096   --fixed-size 4096K
+part loader2    --offset 8192   --fixed-size 4096K            --source rawcopy                                                 --sourceparams="file=u-boot.${UBOOT_SUFFIX}"
+part atf        --offset 12288  --fixed-size 4096K
+part /boot      --offset 16384  --size       114688K --active --source bootimg-partition --fstype=vfat --label boot            --sourceparams="loader=u-boot"
+part /                                                        --source rootfs            --fstype=ext4 --label root --use-uuid
 
-bootloader --ptable gpt --append="console=tty1 console=${RK_CONSOLE_DEVICE},${RK_CONSOLE_BAUD}n8 rw root=/dev/${RK_BOOT_DEVICE}p7 rootfstype=ext4 init=/sbin/init"
+bootloader --ptable gpt --append="console=tty1 console=${RK_CONSOLE_DEVICE},${RK_CONSOLE_BAUD}n8 rw rootfstype=ext4 init=/sbin/init"