* [PATCH 1/4] riscv: sophgo: milkv_duo: initial support added
2024-01-07 11:27 [PATCH 0/4] riscv: sophgo: milkv_duo: add support for Milk-V Duo board Kongyang Liu
@ 2024-01-07 11:27 ` Kongyang Liu
2024-01-08 20:42 ` Tom Rini
2024-01-07 11:27 ` [PATCH 2/4] riscv: dts: sophgo: Add basic device tree for Milk-V Duo board Kongyang Liu
` (2 subsequent siblings)
3 siblings, 1 reply; 7+ messages in thread
From: Kongyang Liu @ 2024-01-07 11:27 UTC (permalink / raw)
To: u-boot
Cc: Bin Meng, Heinrich Schuchardt, Leo, Michal Simek, Randolph,
Rick Chen, Samuel Holland, Shengyu Qu, Yu Chien Peter Lin
Add support for Sophgo's Milk-V Duo board, only minimal device tree and
serial console are enabled, and it can boot via vendor first stage
bootloader.
Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
---
arch/riscv/Kconfig | 4 ++++
board/sophgo/milkv_duo/Kconfig | 28 ++++++++++++++++++++++++++++
board/sophgo/milkv_duo/MAINTAINERS | 6 ++++++
board/sophgo/milkv_duo/Makefile | 5 +++++
board/sophgo/milkv_duo/board.c | 9 +++++++++
include/configs/milkv_duo.h | 16 ++++++++++++++++
6 files changed, 68 insertions(+)
create mode 100644 board/sophgo/milkv_duo/Kconfig
create mode 100644 board/sophgo/milkv_duo/MAINTAINERS
create mode 100644 board/sophgo/milkv_duo/Makefile
create mode 100644 board/sophgo/milkv_duo/board.c
create mode 100644 include/configs/milkv_duo.h
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 6d0d812ddb..de99ce3a28 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -14,6 +14,9 @@ config TARGET_ANDES_AE350
config TARGET_MICROCHIP_ICICLE
bool "Support Microchip PolarFire-SoC Icicle Board"
+config TARGET_MILKV_DUO
+ bool "Support Milk-v Duo Board"
+
config TARGET_OPENPITON_RISCV64
bool "Support RISC-V cores on OpenPiton SoC"
@@ -80,6 +83,7 @@ source "board/openpiton/riscv64/Kconfig"
source "board/sifive/unleashed/Kconfig"
source "board/sifive/unmatched/Kconfig"
source "board/sipeed/maix/Kconfig"
+source "board/sophgo/milkv_duo/Kconfig"
source "board/starfive/visionfive2/Kconfig"
source "board/thead/th1520_lpi4a/Kconfig"
diff --git a/board/sophgo/milkv_duo/Kconfig b/board/sophgo/milkv_duo/Kconfig
new file mode 100644
index 0000000000..2a458f291c
--- /dev/null
+++ b/board/sophgo/milkv_duo/Kconfig
@@ -0,0 +1,28 @@
+if TARGET_MILKV_DUO
+
+config SYS_BOARD
+ default "milkv_duo"
+
+config SYS_VENDOR
+ default "sophgo"
+
+config SYS_CPU
+ default "generic"
+
+config SYS_CONFIG_NAME
+ default "milkv_duo"
+
+config TEXT_BASE
+ default 0x80200000
+
+config ENV_SIZE
+ default 0x20000
+
+config ENV_SECT_SIZE
+ default 0x40000
+
+config BOARD_SPECIFIC_OPTIONS
+ def_bool y
+ select GENERIC_RISCV
+
+endif
diff --git a/board/sophgo/milkv_duo/MAINTAINERS b/board/sophgo/milkv_duo/MAINTAINERS
new file mode 100644
index 0000000000..651a0592f7
--- /dev/null
+++ b/board/sophgo/milkv_duo/MAINTAINERS
@@ -0,0 +1,6 @@
+Milk-V Duo
+M: Kongyang Liu <seashell11234455@gmail.com>
+S: Maintained
+F: board/sophgo/milkv_duo/
+F: configs/milkv_duo_defconfig
+F: doc/board/sophgo/milkv_duo.rst
diff --git a/board/sophgo/milkv_duo/Makefile b/board/sophgo/milkv_duo/Makefile
new file mode 100644
index 0000000000..a087013f5c
--- /dev/null
+++ b/board/sophgo/milkv_duo/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
+
+obj-y := board.o
diff --git a/board/sophgo/milkv_duo/board.c b/board/sophgo/milkv_duo/board.c
new file mode 100644
index 0000000000..eaa47be173
--- /dev/null
+++ b/board/sophgo/milkv_duo/board.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
+ */
+
+int board_init(void)
+{
+ return 0;
+}
diff --git a/include/configs/milkv_duo.h b/include/configs/milkv_duo.h
new file mode 100644
index 0000000000..dd1d146c50
--- /dev/null
+++ b/include/configs/milkv_duo.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
+ *
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#define CFG_SYS_SDRAM_BASE 0x80000000
+
+#define CFG_EXTRA_ENV_SETTINGS \
+ "consoledev=ttyS0" \
+ "baudrate=115200\0" \
+
+#endif /* __CONFIG_H */
--
2.41.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH 1/4] riscv: sophgo: milkv_duo: initial support added
2024-01-07 11:27 ` [PATCH 1/4] riscv: sophgo: milkv_duo: initial support added Kongyang Liu
@ 2024-01-08 20:42 ` Tom Rini
2024-01-11 17:32 ` 刘孔阳
0 siblings, 1 reply; 7+ messages in thread
From: Tom Rini @ 2024-01-08 20:42 UTC (permalink / raw)
To: Kongyang Liu
Cc: u-boot, Bin Meng, Heinrich Schuchardt, Leo, Michal Simek,
Randolph, Rick Chen, Samuel Holland, Shengyu Qu,
Yu Chien Peter Lin
[-- Attachment #1: Type: text/plain, Size: 1928 bytes --]
On Sun, Jan 07, 2024 at 07:27:07PM +0800, Kongyang Liu wrote:
> Add support for Sophgo's Milk-V Duo board, only minimal device tree and
> serial console are enabled, and it can boot via vendor first stage
> bootloader.
>
> Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
>
> ---
>
> arch/riscv/Kconfig | 4 ++++
> board/sophgo/milkv_duo/Kconfig | 28 ++++++++++++++++++++++++++++
> board/sophgo/milkv_duo/MAINTAINERS | 6 ++++++
> board/sophgo/milkv_duo/Makefile | 5 +++++
> board/sophgo/milkv_duo/board.c | 9 +++++++++
> include/configs/milkv_duo.h | 16 ++++++++++++++++
The defconfig patch should be folded in to this one.
[snip]
> diff --git a/board/sophgo/milkv_duo/board.c b/board/sophgo/milkv_duo/board.c
> new file mode 100644
> index 0000000000..eaa47be173
> --- /dev/null
> +++ b/board/sophgo/milkv_duo/board.c
> @@ -0,0 +1,9 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
> + */
> +
> +int board_init(void)
> +{
> + return 0;
> +}
Shouldn't you enable caches here?
> diff --git a/include/configs/milkv_duo.h b/include/configs/milkv_duo.h
> new file mode 100644
> index 0000000000..dd1d146c50
> --- /dev/null
> +++ b/include/configs/milkv_duo.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
> + *
> + */
> +
> +#ifndef __CONFIG_H
> +#define __CONFIG_H
> +
> +#define CFG_SYS_SDRAM_BASE 0x80000000
> +
> +#define CFG_EXTRA_ENV_SETTINGS \
> + "consoledev=ttyS0" \
> + "baudrate=115200\0" \
We shouldn't need to set baudrate, it will be handled for us. Is
consoledev something that must be set? Can it all be done in a plain
text environment anyhow? Thanks.
--
Tom
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 659 bytes --]
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH 1/4] riscv: sophgo: milkv_duo: initial support added
2024-01-08 20:42 ` Tom Rini
@ 2024-01-11 17:32 ` 刘孔阳
0 siblings, 0 replies; 7+ messages in thread
From: 刘孔阳 @ 2024-01-11 17:32 UTC (permalink / raw)
To: Tom Rini
Cc: u-boot, Bin Meng, Heinrich Schuchardt, Leo, Michal Simek,
Randolph, Rick Chen, Samuel Holland, Shengyu Qu,
Yu Chien Peter Lin
Tom Rini <trini@konsulko.com> 于2024年1月9日周二 04:42写道：
>
> On Sun, Jan 07, 2024 at 07:27:07PM +0800, Kongyang Liu wrote:
>
> > Add support for Sophgo's Milk-V Duo board, only minimal device tree and
> > serial console are enabled, and it can boot via vendor first stage
> > bootloader.
> >
> > Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
> >
> > ---
> >
> > arch/riscv/Kconfig | 4 ++++
> > board/sophgo/milkv_duo/Kconfig | 28 ++++++++++++++++++++++++++++
> > board/sophgo/milkv_duo/MAINTAINERS | 6 ++++++
> > board/sophgo/milkv_duo/Makefile | 5 +++++
> > board/sophgo/milkv_duo/board.c | 9 +++++++++
> > include/configs/milkv_duo.h | 16 ++++++++++++++++
>
> The defconfig patch should be folded in to this one.
>
I will fold it in next version.
> [snip]
> > diff --git a/board/sophgo/milkv_duo/board.c b/board/sophgo/milkv_duo/board.c
> > new file mode 100644
> > index 0000000000..eaa47be173
> > --- /dev/null
> > +++ b/board/sophgo/milkv_duo/board.c
> > @@ -0,0 +1,9 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
> > + */
> > +
> > +int board_init(void)
> > +{
> > + return 0;
> > +}
>
> Shouldn't you enable caches here?
>
Enable caches will cause other problems, and I will implement it
in subsequent patches.
> > diff --git a/include/configs/milkv_duo.h b/include/configs/milkv_duo.h
> > new file mode 100644
> > index 0000000000..dd1d146c50
> > --- /dev/null
> > +++ b/include/configs/milkv_duo.h
> > @@ -0,0 +1,16 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/*
> > + * Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
> > + *
> > + */
> > +
> > +#ifndef __CONFIG_H
> > +#define __CONFIG_H
> > +
> > +#define CFG_SYS_SDRAM_BASE 0x80000000
> > +
> > +#define CFG_EXTRA_ENV_SETTINGS \
> > + "consoledev=ttyS0" \
> > + "baudrate=115200\0" \
>
> We shouldn't need to set baudrate, it will be handled for us. Is
> consoledev something that must be set? Can it all be done in a plain
> text environment anyhow? Thanks.
>
I will check and detele it if it is unnecessary.
Best regards
Kongyang Liu
> --
> Tom
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH 2/4] riscv: dts: sophgo: Add basic device tree for Milk-V Duo board
2024-01-07 11:27 [PATCH 0/4] riscv: sophgo: milkv_duo: add support for Milk-V Duo board Kongyang Liu
2024-01-07 11:27 ` [PATCH 1/4] riscv: sophgo: milkv_duo: initial support added Kongyang Liu
@ 2024-01-07 11:27 ` Kongyang Liu
2024-01-07 11:27 ` [PATCH 3/4] configs: milkv_duo_defconfig: Add initial config Kongyang Liu
2024-01-07 11:27 ` [PATCH 4/4] doc: sophgo: milkv_duo: document Milk-V Duo board Kongyang Liu
3 siblings, 0 replies; 7+ messages in thread
From: Kongyang Liu @ 2024-01-07 11:27 UTC (permalink / raw)
To: u-boot
Cc: Conor Dooley, Leo, Randolph, Rick Chen, Yanhong Wang, Yixun Lan,
Yu Chien Peter Lin
Import device tree from Linux kernel to add basic support for CPU, PLIC,
UART and Timer. The name cv1800b in the filename represent the chip used
on Milk-V Duo board.
Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
---
arch/riscv/dts/Makefile | 1 +
arch/riscv/dts/cv1800b-milkv-duo.dts | 38 +++++++++
arch/riscv/dts/cv1800b.dtsi | 123 +++++++++++++++++++++++++++
3 files changed, 162 insertions(+)
create mode 100644 arch/riscv/dts/cv1800b-milkv-duo.dts
create mode 100644 arch/riscv/dts/cv1800b.dtsi
diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
index be6c8a4227..b9e1678676 100644
--- a/arch/riscv/dts/Makefile
+++ b/arch/riscv/dts/Makefile
@@ -2,6 +2,7 @@
dtb-$(CONFIG_TARGET_ANDES_AE350) += ae350_32.dtb ae350_64.dtb
dtb-$(CONFIG_TARGET_MICROCHIP_ICICLE) += mpfs-icicle-kit.dtb
+dtb-$(CONFIG_TARGET_MILKV_DUO) += cv1800b-milkv-duo.dtb
dtb-$(CONFIG_TARGET_QEMU_VIRT) += qemu-virt32.dtb qemu-virt64.dtb
dtb-$(CONFIG_TARGET_OPENPITON_RISCV64) += openpiton-riscv64.dtb
dtb-$(CONFIG_TARGET_SIFIVE_UNLEASHED) += hifive-unleashed-a00.dtb
diff --git a/arch/riscv/dts/cv1800b-milkv-duo.dts b/arch/riscv/dts/cv1800b-milkv-duo.dts
new file mode 100644
index 0000000000..3af9e34b3b
--- /dev/null
+++ b/arch/riscv/dts/cv1800b-milkv-duo.dts
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2023 Jisheng Zhang <jszhang@kernel.org>
+ */
+
+/dts-v1/;
+
+#include "cv1800b.dtsi"
+
+/ {
+ model = "Milk-V Duo";
+ compatible = "milkv,duo", "sophgo,cv1800b";
+
+ aliases {
+ serial0 = &uart0;
+ serial1 = &uart1;
+ serial2 = &uart2;
+ serial3 = &uart3;
+ serial4 = &uart4;
+ };
+
+ chosen {
+ stdout-path = "serial0:115200n8";
+ };
+
+ memory@80000000 {
+ device_type = "memory";
+ reg = <0x80000000 0x3f40000>;
+ };
+};
+
+&osc {
+ clock-frequency = <25000000>;
+};
+
+&uart0 {
+ status = "okay";
+};
diff --git a/arch/riscv/dts/cv1800b.dtsi b/arch/riscv/dts/cv1800b.dtsi
new file mode 100644
index 0000000000..df40e87ee0
--- /dev/null
+++ b/arch/riscv/dts/cv1800b.dtsi
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2023 Jisheng Zhang <jszhang@kernel.org>
+ */
+
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+ compatible = "sophgo,cv1800b";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ cpus: cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ timebase-frequency = <25000000>;
+
+ cpu0: cpu@0 {
+ compatible = "thead,c906", "riscv";
+ device_type = "cpu";
+ reg = <0>;
+ d-cache-block-size = <64>;
+ d-cache-sets = <512>;
+ d-cache-size = <65536>;
+ i-cache-block-size = <64>;
+ i-cache-sets = <128>;
+ i-cache-size = <32768>;
+ mmu-type = "riscv,sv39";
+ riscv,isa = "rv64imafdc";
+ riscv,isa-base = "rv64i";
+ riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr",
+ "zifencei", "zihpm";
+
+ cpu0_intc: interrupt-controller {
+ compatible = "riscv,cpu-intc";
+ interrupt-controller;
+ #address-cells = <0>;
+ #interrupt-cells = <1>;
+ };
+ };
+ };
+
+ osc: oscillator {
+ compatible = "fixed-clock";
+ clock-output-names = "osc_25m";
+ #clock-cells = <0>;
+ };
+
+ soc {
+ compatible = "simple-bus";
+ interrupt-parent = <&plic>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ dma-noncoherent;
+ ranges;
+
+ uart0: serial@4140000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x04140000 0x100>;
+ interrupts = <44 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&osc>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ status = "disabled";
+ };
+
+ uart1: serial@4150000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x04150000 0x100>;
+ interrupts = <45 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&osc>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ status = "disabled";
+ };
+
+ uart2: serial@4160000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x04160000 0x100>;
+ interrupts = <46 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&osc>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ status = "disabled";
+ };
+
+ uart3: serial@4170000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x04170000 0x100>;
+ interrupts = <47 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&osc>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ status = "disabled";
+ };
+
+ uart4: serial@41c0000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x041c0000 0x100>;
+ interrupts = <48 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&osc>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ status = "disabled";
+ };
+
+ plic: interrupt-controller@70000000 {
+ compatible = "sophgo,cv1800b-plic", "thead,c900-plic";
+ reg = <0x70000000 0x4000000>;
+ interrupts-extended = <&cpu0_intc 11>, <&cpu0_intc 9>;
+ interrupt-controller;
+ #address-cells = <0>;
+ #interrupt-cells = <2>;
+ riscv,ndev = <101>;
+ };
+
+ clint: timer@74000000 {
+ compatible = "sophgo,cv1800b-clint", "thead,c900-clint";
+ reg = <0x74000000 0x10000>;
+ interrupts-extended = <&cpu0_intc 3>, <&cpu0_intc 7>;
+ };
+ };
+};
--
2.41.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH 3/4] configs: milkv_duo_defconfig: Add initial config
2024-01-07 11:27 [PATCH 0/4] riscv: sophgo: milkv_duo: add support for Milk-V Duo board Kongyang Liu
2024-01-07 11:27 ` [PATCH 1/4] riscv: sophgo: milkv_duo: initial support added Kongyang Liu
2024-01-07 11:27 ` [PATCH 2/4] riscv: dts: sophgo: Add basic device tree for Milk-V Duo board Kongyang Liu
@ 2024-01-07 11:27 ` Kongyang Liu
2024-01-07 11:27 ` [PATCH 4/4] doc: sophgo: milkv_duo: document Milk-V Duo board Kongyang Liu
3 siblings, 0 replies; 7+ messages in thread
From: Kongyang Liu @ 2024-01-07 11:27 UTC (permalink / raw)
To: u-boot
Add basic config for Milk-V Duo board which make it capable of booting into
serial console.
Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
---
configs/milkv_duo_defconfig | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
create mode 100644 configs/milkv_duo_defconfig
diff --git a/configs/milkv_duo_defconfig b/configs/milkv_duo_defconfig
new file mode 100644
index 0000000000..c4782639ef
--- /dev/null
+++ b/configs/milkv_duo_defconfig
@@ -0,0 +1,24 @@
+CONFIG_RISCV=y
+CONFIG_SYS_MALLOC_LEN=0x820000
+CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
+CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x82300000
+CONFIG_DEFAULT_DEVICE_TREE="cv1800b-milkv-duo"
+CONFIG_IDENT_STRING="milkv_duo"
+CONFIG_SYS_LOAD_ADDR=0x80080000
+CONFIG_TARGET_MILKV_DUO=y
+CONFIG_ARCH_RV64I=y
+CONFIG_RISCV_SMODE=y
+CONFIG_FIT=y
+CONFIG_SUPPORT_RAW_INITRD=y
+CONFIG_HUSH_PARSER=y
+CONFIG_SYS_PROMPT="milkv_duo# "
+CONFIG_SYS_MAXARGS=64
+CONFIG_SYS_CBSIZE=512
+CONFIG_SYS_PBSIZE=544
+CONFIG_SYS_BOOTM_LEN=0x4000000
+CONFIG_ENV_OVERWRITE=y
+CONFIG_SYS_NS16550=y
+CONFIG_SYS_NS16550_MEM32=y
+# CONFIG_EFI_LOADER is not set
--
2.41.0
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH 4/4] doc: sophgo: milkv_duo: document Milk-V Duo board
2024-01-07 11:27 [PATCH 0/4] riscv: sophgo: milkv_duo: add support for Milk-V Duo board Kongyang Liu
` (2 preceding siblings ...)
2024-01-07 11:27 ` [PATCH 3/4] configs: milkv_duo_defconfig: Add initial config Kongyang Liu
@ 2024-01-07 11:27 ` Kongyang Liu
3 siblings, 0 replies; 7+ messages in thread
From: Kongyang Liu @ 2024-01-07 11:27 UTC (permalink / raw)
To: u-boot
Cc: Adam Ford, Chris Morgan, Fabio Estevam, Heinrich Schuchardt,
Ralph Siemsen, Svyatoslav Ryhel, Thierry Reding, Tim Harvey,
Wei Fu, Yanhong Wang, Yannic Moog, Yixun Lan
Add document for Milk-V Duo board which based on Sophgo's CV1800B SoC.
Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
---
doc/board/index.rst | 1 +
doc/board/sophgo/index.rst | 8 ++++++
doc/board/sophgo/milkv_duo.rst | 50 ++++++++++++++++++++++++++++++++++
3 files changed, 59 insertions(+)
create mode 100644 doc/board/sophgo/index.rst
create mode 100644 doc/board/sophgo/milkv_duo.rst
diff --git a/doc/board/index.rst b/doc/board/index.rst
index 531e547e7e..a0bd534742 100644
--- a/doc/board/index.rst
+++ b/doc/board/index.rst
@@ -45,6 +45,7 @@ Board-specific doc
sifive/index
sipeed/index
socionext/index
+ sophgo/index
st/index
starfive/index
ste/index
diff --git a/doc/board/sophgo/index.rst b/doc/board/sophgo/index.rst
new file mode 100644
index 0000000000..e097afdac6
--- /dev/null
+++ b/doc/board/sophgo/index.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Sophgo
+======
+.. toctree::
+ :maxdepth: 1
+
+ milkv_duo
diff --git a/doc/board/sophgo/milkv_duo.rst b/doc/board/sophgo/milkv_duo.rst
new file mode 100644
index 0000000000..b63304b510
--- /dev/null
+++ b/doc/board/sophgo/milkv_duo.rst
@@ -0,0 +1,50 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Milk-V Duo
+==========
+
+CV1800B RISC-V SoC
+------------------
+The CV1800B is a high-performance, low-power 1+1 64-bit RISC-V SoC from Sophgo.
+
+Mainline support
+----------------
+The support for following drivers are already enabled:
+1. ns16550 UART Driver.
+
+Building
+~~~~~~~~
+1. Add the RISC-V toolchain to your PATH.
+2. Setup ARCH & cross compilation environment variable:
+
+.. code-block:: console
+
+ export CROSS_COMPILE=<riscv64 toolchain prefix>
+ cd <U-Boot-dir>
+ make milkv_duo_defconfig
+ make
+
+This will generate u-boot-dtb.bin
+
+Booting
+~~~~~~~
+Currently, we rely on vendor FSBL(First Stage Boot Loader) to initialize the
+clock and load the u-boot image, then bootup from it.
+
+Sample boot log from Milk-V Duo board
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. code-block:: none
+
+ U-Boot 2024.01-rc5-00010-g51965baa36 (Dec 28 2023 - 13:15:53 +0800)milkv_duo
+
+ DRAM: 63.3 MiB
+ Core: 10 devices, 8 uclasses, devicetree: separate
+ Loading Environment from nowhere... OK
+ In: serial@4140000
+ Out: serial@4140000
+ Err: serial@4140000
+ Net: No ethernet found.
+ milkv_duo# cpu detail
+ 0: cpu@0 rv64imafdc
+ ID = 0, freq = 0 Hz: L1 cache, MMU
+ milkv_duo#
--
2.41.0
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