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diff --git a/sys/dts/Makefile b/sys/dts/Makefile
--- a/sys/dts/Makefile
+++ b/sys/dts/Makefile
@@ -1,3 +1,3 @@
-SUBDIR=arm powerpc
+SUBDIR=arm powerpc riscv
.include <bsd.subdir.mk>
diff --git a/sys/dts/riscv/Makefile b/sys/dts/riscv/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/dts/riscv/Makefile
@@ -0,0 +1,5 @@
+DTS!=ls ${.CURDIR}/*.dts
+
+all: test-dts
+
+.include <bsd.init.mk>
diff --git a/sys/dts/riscv/Makefile.inc b/sys/dts/riscv/Makefile.inc
new file mode 100644
--- /dev/null
+++ b/sys/dts/riscv/Makefile.inc
@@ -0,0 +1 @@
+.include "../Makefile.inc"
diff --git a/sys/dts/riscv/overlays/Makefile b/sys/dts/riscv/overlays/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/dts/riscv/overlays/Makefile
@@ -0,0 +1,5 @@
+DTSO!=ls ${.CURDIR}/*.dtso
+
+all: test-dtso
+
+.include <bsd.init.mk>
diff --git a/sys/dts/riscv/overlays/k1-bananapi-f3-mmc0.dtso b/sys/dts/riscv/overlays/k1-bananapi-f3-mmc0.dtso
new file mode 100644
--- /dev/null
+++ b/sys/dts/riscv/overlays/k1-bananapi-f3-mmc0.dtso
@@ -0,0 +1,14 @@
+/dts-v1/;
+/plugin/;
+/ {
+ compatible = "bananapi,bpi-f3", "spacemit,k1";
+};
+&sd {
+ bus-width = <4>;
+ wp-inverted;
+ no-mmc;
+ no-sdio;
+ /* SD supports clock rates up to SDR104. */
+ max-frequency = <208000000>;
+ status = "okay";
+};
diff --git a/sys/dts/riscv/overlays/spacemit-k1-mmc0-enable.dtso b/sys/dts/riscv/overlays/spacemit-k1-mmc0-enable.dtso
new file mode 100644
--- /dev/null
+++ b/sys/dts/riscv/overlays/spacemit-k1-mmc0-enable.dtso
@@ -0,0 +1,21 @@
+#include <dt-bindings/clock/spacemit,k1-syscon.h>
+
+/dts-v1/;
+/plugin/;
+/ {
+ compatible = "spacemit,k1";
+};
+&{/soc/storage-bus} {
+ sd: mmc@d4280000 {
+ compatible = "spacemit,k1-sdhci";
+ reg = <0x0 0xd4280000 0x0 0x200>;
+ clocks = <&syscon_apmu CLK_SDH_AXI>,
+ <&syscon_apmu CLK_SDH0>;
+ clock-names = "core", "io";
+ resets = <&syscon_apmu RESET_SDH_AXI>,
+ <&syscon_apmu RESET_SDH0>;
+ reset-names = "axi", "sdh";
+ interrupts = <99>;
+ status = "disabled";
+ };
+};
diff --git a/sys/modules/dtb/spacemit/Makefile b/sys/modules/dtb/spacemit/Makefile
--- a/sys/modules/dtb/spacemit/Makefile
+++ b/sys/modules/dtb/spacemit/Makefile
@@ -1,3 +1,5 @@
DTS= spacemit/k1-bananapi-f3.dts
+DTSO= spacemit-k1-mmc0-enable.dtso \
+ k1-bananapi-f3-mmc0.dtso
.include <bsd.dtb.mk>

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