[PATCH 0/2] board: sophgo: add support for Milk-V Duo 256M

[PATCH 0/2] board: sophgo: add support for Milk-V Duo 256M

[Hiago De Franco]

Milk-V Duo 256M is a small development board based on the Sophgo SG2002
SoC.

U-Boot runs as the S-mode payload on top of the vendor FSBL and OpenSBI,
packaged together into a FIP image on the SD card.

The vendor FIP tool prepends a 32-byte loader header to u-boot.bin and
loads the result at 0x80200000, so TEXT_BASE is set to 0x80200020 to
match the address the U-Boot code actually runs.

The following peripherals are supported:
- ns16550 serial console (UART0)
- SD/MMC
- Ethernet with the SoC internal PHY

This patch was tested on Milk-V Duo 256MB using an SD card and the Duo
USB & Ethernet IOB (base board) [0].

This series uses the CV1800B SYS_CPU target since SG2002 shares common
IPs with CV1800B. Other SG2002 as LicheeRV Nano does the same.

Note: Linux device tree is not yet merged [1], therefore I am adding a
device tree here and it can be later changed to use the kernel upstream
one. 

[0] https://milkv.io/docs/duo/io-board/usb-ethernet-iob
[1] https://lore.kernel.org/lkml/20260710075917.159969-1-chenyou910331@gmail.com/

Link: https://milkv.io/docs/duo/getting-started/duo256m
Signed-off-by: Hiago De Franco <hfranco@baylibre.com>
---
Hiago De Franco (2):
      board: sophgo: move ethernet driver to common directory
      board: sophgo: add support for Milk-V Duo 256M

 arch/riscv/Kconfig                             |  4 ++
 arch/riscv/dts/Makefile                        |  1 +
 arch/riscv/dts/sg2002-milkv-duo256m.dts        | 46 +++++++++++++++
 board/sophgo/{milkv_duo => common}/ethernet.c  |  0
 board/sophgo/{milkv_duo => common}/ethernet.h  |  0
 board/sophgo/milkv_duo/MAINTAINERS             |  1 +
 board/sophgo/milkv_duo/Makefile                |  2 +-
 board/sophgo/milkv_duo/board.c                 |  2 +-
 board/sophgo/milkv_duo_256m/Kconfig            | 30 ++++++++++
 board/sophgo/milkv_duo_256m/MAINTAINERS        |  5 ++
 board/sophgo/milkv_duo_256m/Makefile           |  6 ++
 board/sophgo/milkv_duo_256m/board.c            | 19 ++++++
 board/sophgo/milkv_duo_256m/milkv_duo_256m.env |  8 +++
 configs/milkv_duo_256m_defconfig               | 42 +++++++++++++
 doc/board/sophgo/index.rst                     |  1 +
 doc/board/sophgo/milkv_duo_256m.rst            | 82 ++++++++++++++++++++++++++
 include/configs/milkv_duo_256m.h               | 12 ++++
 17 files changed, 259 insertions(+), 2 deletions(-)
---
base-commit: ece349ade2973e220f524ce59e59711cc919263f
change-id: 20260710-add-milkv-duo256m-1662c5cafb35

Best regards,
-- 
Hiago De Franco <hfranco@baylibre.com>

[PATCH 1/2] board: sophgo: move ethernet driver to common directory

[Hiago De Franco]

This will make easier for future boards to reuse the same driver (e.g.
Milk-V Duo 256MB).

Signed-off-by: Hiago De Franco <hfranco@baylibre.com>
---
 board/sophgo/{milkv_duo => common}/ethernet.c | 0
 board/sophgo/{milkv_duo => common}/ethernet.h | 0
 board/sophgo/milkv_duo/MAINTAINERS            | 1 +
 board/sophgo/milkv_duo/Makefile               | 2 +-
 board/sophgo/milkv_duo/board.c                | 2 +-
 5 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/board/sophgo/milkv_duo/ethernet.c b/board/sophgo/common/ethernet.c
similarity index 100%
rename from board/sophgo/milkv_duo/ethernet.c
rename to board/sophgo/common/ethernet.c
diff --git a/board/sophgo/milkv_duo/ethernet.h b/board/sophgo/common/ethernet.h
similarity index 100%
rename from board/sophgo/milkv_duo/ethernet.h
rename to board/sophgo/common/ethernet.h
diff --git a/board/sophgo/milkv_duo/MAINTAINERS b/board/sophgo/milkv_duo/MAINTAINERS
index 651a0592f7a..6941dc5b376 100644
--- a/board/sophgo/milkv_duo/MAINTAINERS
+++ b/board/sophgo/milkv_duo/MAINTAINERS
@@ -2,5 +2,6 @@ Milk-V Duo
 M:	Kongyang Liu <seashell11234455@gmail.com>
 S:	Maintained
 F:	board/sophgo/milkv_duo/
+F:	board/sophgo/common/
 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
index 18ada7d72ff..aa321d15687 100644
--- a/board/sophgo/milkv_duo/Makefile
+++ b/board/sophgo/milkv_duo/Makefile
@@ -3,4 +3,4 @@
 # Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
 
 obj-y += board.o
-obj-$(CONFIG_NET_LEGACY) += ethernet.o
+obj-$(CONFIG_NET_LEGACY) += ../common/ethernet.o
diff --git a/board/sophgo/milkv_duo/board.c b/board/sophgo/milkv_duo/board.c
index f0944859b58..34339c42925 100644
--- a/board/sophgo/milkv_duo/board.c
+++ b/board/sophgo/milkv_duo/board.c
@@ -5,7 +5,7 @@
 
 #include <dm/lists.h>
 
-#include "ethernet.h"
+#include "../common/ethernet.h"
 
 int board_init(void)
 {

-- 
2.54.0

[PATCH 2/2] board: sophgo: add support for Milk-V Duo 256M

[Hiago De Franco]

Add U-Boot support for Milk-V Duo 256M.

This board has a different SoC compared to the Milk-V Duo 64M, it uses
the Sophgo SG2002 instead of the Sophgo CV1800B. Both SoCs share many
common IP blocks, so this board reuses the existing cv1800b CPU support.

Link: https://milkv.io/docs/duo/getting-started/duo256m
Signed-off-by: Hiago De Franco <hfranco@baylibre.com>
---
 arch/riscv/Kconfig                             |  4 ++
 arch/riscv/dts/Makefile                        |  1 +
 arch/riscv/dts/sg2002-milkv-duo256m.dts        | 46 +++++++++++++++
 board/sophgo/milkv_duo_256m/Kconfig            | 30 ++++++++++
 board/sophgo/milkv_duo_256m/MAINTAINERS        |  5 ++
 board/sophgo/milkv_duo_256m/Makefile           |  6 ++
 board/sophgo/milkv_duo_256m/board.c            | 19 ++++++
 board/sophgo/milkv_duo_256m/milkv_duo_256m.env |  8 +++
 configs/milkv_duo_256m_defconfig               | 42 +++++++++++++
 doc/board/sophgo/index.rst                     |  1 +
 doc/board/sophgo/milkv_duo_256m.rst            | 82 ++++++++++++++++++++++++++
 include/configs/milkv_duo_256m.h               | 12 ++++
 12 files changed, 256 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index ad7589123c6..8a285c32072 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -32,6 +32,9 @@ config TARGET_MICROCHIP_GENERIC
 config TARGET_MILKV_DUO
 	bool "Support Milk-v Duo Board"
 
+config TARGET_MILKV_DUO_256M
+	bool "Support Milk-V Duo 256M Board"
+
 config TARGET_OPENPITON_RISCV64
 	bool "Support RISC-V cores on OpenPiton SoC"
 
@@ -118,6 +121,7 @@ source "board/sifive/unleashed/Kconfig"
 source "board/sifive/unmatched/Kconfig"
 source "board/sipeed/maix/Kconfig"
 source "board/sophgo/milkv_duo/Kconfig"
+source "board/sophgo/milkv_duo_256m/Kconfig"
 source "board/sophgo/licheerv_nano/Kconfig"
 source "board/spacemit/bananapi-f3/Kconfig"
 source "board/starfive/visionfive2/Kconfig"
diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
index 8e591cb7aa9..c20b980b3af 100644
--- a/arch/riscv/dts/Makefile
+++ b/arch/riscv/dts/Makefile
@@ -6,6 +6,7 @@ dtb-$(CONFIG_TARGET_BANANAPI_F3) += k1-bananapi-f3.dtb
 dtb-$(CONFIG_TARGET_K230_CANMV) += k230-canmv.dtb
 dtb-$(CONFIG_TARGET_MICROCHIP_ICICLE) += mpfs-icicle-kit.dtb
 dtb-$(CONFIG_TARGET_MILKV_DUO) += cv1800b-milkv-duo.dtb
+dtb-$(CONFIG_TARGET_MILKV_DUO_256M) += sg2002-milkv-duo256m.dtb
 dtb-$(CONFIG_TARGET_LICHEERV_NANO) += sg2002-licheerv-nano-b.dtb
 dtb-$(CONFIG_TARGET_QEMU_VIRT) += qemu-virt32.dtb qemu-virt64.dtb
 dtb-$(CONFIG_TARGET_OPENPITON_RISCV64) += openpiton-riscv64.dtb
diff --git a/arch/riscv/dts/sg2002-milkv-duo256m.dts b/arch/riscv/dts/sg2002-milkv-duo256m.dts
new file mode 100644
index 00000000000..4ad86ce39ec
--- /dev/null
+++ b/arch/riscv/dts/sg2002-milkv-duo256m.dts
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2026 Hiago De Franco <hfranco@baylibre.com>
+ */
+
+/dts-v1/;
+
+#include "sg2002.dtsi"
+
+/ {
+	model = "Milk-V Duo 256M";
+	compatible = "milkv,duo256m", "sophgo,sg2002";
+
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+		serial3 = &uart3;
+		serial4 = &uart4;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&ethernet0 {
+	status = "okay";
+	phy-mode = "rmii";
+};
+
+&osc {
+	clock-frequency = <25000000>;
+};
+
+&sdhci0 {
+	status = "okay";
+	bus-width = <4>;
+	no-1-8-v;
+	no-mmc;
+	no-sdio;
+};
+
+&uart0 {
+	status = "okay";
+};
diff --git a/board/sophgo/milkv_duo_256m/Kconfig b/board/sophgo/milkv_duo_256m/Kconfig
new file mode 100644
index 00000000000..a443207f65e
--- /dev/null
+++ b/board/sophgo/milkv_duo_256m/Kconfig
@@ -0,0 +1,30 @@
+if TARGET_MILKV_DUO_256M
+
+config SYS_BOARD
+	default "milkv_duo_256m"
+
+config SYS_VENDOR
+	default "sophgo"
+
+config SYS_CPU
+	default "cv1800b"
+
+config SYS_CONFIG_NAME
+	default "milkv_duo_256m"
+
+# The vendor FIP tool prepends a 32-byte loader header to u-boot.bin and loads
+# the result at 0x80200000, so the U-Boot code runs 0x20 bytes above that.
+config TEXT_BASE
+	default 0x80200020
+
+config ENV_SIZE
+	default 0x20000
+
+config ENV_SECT_SIZE
+	default 0x40000
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select SOPHGO_CV1800B
+
+endif
diff --git a/board/sophgo/milkv_duo_256m/MAINTAINERS b/board/sophgo/milkv_duo_256m/MAINTAINERS
new file mode 100644
index 00000000000..929960e7251
--- /dev/null
+++ b/board/sophgo/milkv_duo_256m/MAINTAINERS
@@ -0,0 +1,5 @@
+Milk-V Duo 256M
+M:	Hiago De Franco <hfranco@baylibre.com>
+S:	Maintained
+F:	board/sophgo/milkv_duo_256m/
+F:	configs/milkv_duo_256m_defconfig
diff --git a/board/sophgo/milkv_duo_256m/Makefile b/board/sophgo/milkv_duo_256m/Makefile
new file mode 100644
index 00000000000..2b3c84fe594
--- /dev/null
+++ b/board/sophgo/milkv_duo_256m/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (c) 2026, Hiago De Franco <hfranco@baylibre.com>
+
+obj-y += board.o
+obj-$(CONFIG_NET_LEGACY) += ../common/ethernet.o
diff --git a/board/sophgo/milkv_duo_256m/board.c b/board/sophgo/milkv_duo_256m/board.c
new file mode 100644
index 00000000000..b8454e0a1e9
--- /dev/null
+++ b/board/sophgo/milkv_duo_256m/board.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2026, Hiago De Franco <hfranco@baylibre.com>
+ */
+
+#include <dm/lists.h>
+
+#include "../common/ethernet.h"
+
+int board_init(void)
+{
+	if (IS_ENABLED(CONFIG_SYSRESET_CV1800B))
+		device_bind_driver(gd->dm_root, "cv1800b_sysreset", "sysreset", NULL);
+
+	if (IS_ENABLED(CONFIG_NET_LEGACY))
+		cv1800b_ephy_init();
+
+	return 0;
+}
diff --git a/board/sophgo/milkv_duo_256m/milkv_duo_256m.env b/board/sophgo/milkv_duo_256m/milkv_duo_256m.env
new file mode 100644
index 00000000000..4c1e17b53ca
--- /dev/null
+++ b/board/sophgo/milkv_duo_256m/milkv_duo_256m.env
@@ -0,0 +1,8 @@
+fdt_addr_r=0x84000000
+fdtfile=CONFIG_DEFAULT_DEVICE_TREE.dtb
+kernel_addr_r=0x80200000
+kernel_comp_addr_r=0x88000000
+kernel_comp_size=0x4000000
+pxefile_addr_r=0x84300000
+ramdisk_addr_r=0x84400000
+scriptaddr=0x84200000
diff --git a/configs/milkv_duo_256m_defconfig b/configs/milkv_duo_256m_defconfig
new file mode 100644
index 00000000000..9d92eec6394
--- /dev/null
+++ b/configs/milkv_duo_256m_defconfig
@@ -0,0 +1,42 @@
+CONFIG_RISCV=y
+CONFIG_SYS_MALLOC_LEN=0x820000
+CONFIG_SYS_MALLOC_F_LEN=0x8000
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
+CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x82300000
+CONFIG_DEFAULT_DEVICE_TREE="sg2002-milkv-duo256m"
+CONFIG_SYS_LOAD_ADDR=0x80080000
+CONFIG_IDENT_STRING="milkv_duo_256m"
+CONFIG_TARGET_MILKV_DUO_256M=y
+CONFIG_ARCH_RV64I=y
+CONFIG_RISCV_SMODE=y
+CONFIG_FIT=y
+CONFIG_BOOTSTD_FULL=y
+# CONFIG_BOOTMETH_EFI_BOOTMGR is not set
+CONFIG_SD_BOOT=y
+CONFIG_SYS_CBSIZE=512
+CONFIG_SYS_PBSIZE=544
+CONFIG_SYS_PROMPT="milkv_duo_256m# "
+# CONFIG_CMD_BOOTDEV is not set
+CONFIG_CMD_MBR=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_POWEROFF=y
+# CONFIG_CMD_MII is not set
+CONFIG_CMD_EXT4_WRITE=y
+# CONFIG_ISO_PARTITION is not set
+# CONFIG_EFI_PARTITION is not set
+CONFIG_ENV_OVERWRITE=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_CLK_SOPHGO_CV1800B=y
+CONFIG_MMC=y
+CONFIG_MMC_IO_VOLTAGE=y
+CONFIG_MMC_UHS_SUPPORT=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_ADMA=y
+CONFIG_MMC_SDHCI_CV1800B=y
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_SYS_NS16550=y
+CONFIG_SYS_NS16550_MEM32=y
+CONFIG_SPI=y
+CONFIG_SYSRESET=y
+CONFIG_SYSRESET_CV1800B=y
diff --git a/doc/board/sophgo/index.rst b/doc/board/sophgo/index.rst
index 26dba4a4851..19c9a19b1d4 100644
--- a/doc/board/sophgo/index.rst
+++ b/doc/board/sophgo/index.rst
@@ -6,4 +6,5 @@ Sophgo
    :maxdepth: 1
 
    milkv_duo
+   milkv_duo_256m
    licheerv_nano
diff --git a/doc/board/sophgo/milkv_duo_256m.rst b/doc/board/sophgo/milkv_duo_256m.rst
new file mode 100644
index 00000000000..671f3a0b964
--- /dev/null
+++ b/doc/board/sophgo/milkv_duo_256m.rst
@@ -0,0 +1,82 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Milk-V Duo 256M
+===============
+
+SG2002 RISC-V SoC
+------------------
+The SG2002 is a high-performance, low-power 64-bit RISC-V/ARM SoC from Sophgo.
+
+Mainline support
+----------------
+The support for following drivers are already enabled:
+1. ns16550 UART Driver.
+2. Synopsys Designware MSHC 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_256m_defconfig
+   make
+
+This will generate u-boot.bin
+
+Booting
+~~~~~~~
+Currently, we rely on vendor FSBL (First Stage Boot Loader) to initialize the
+clock and load OpenSBI and the u-boot image, then bootup from it.
+
+To run u-boot.bin on top of FSBL, follow these steps:
+
+1. Generate a compatible u-boot.bin using U-Boot with the Milk-V Duo 256M
+   default configuration.
+
+2. Use mainline OpenSBI with a newer version than 1.5 to generate fw_dynamic.
+   Use FDT_FW_PATH to point to sg2002-milkv-duo256m.dtb device tree file while
+   compiling fw_dynamic. Example:
+
+.. code-block:: console
+
+   cd open-sbi
+   PLATFORM=generic FW_FDT_PATH=../u-boot/arch/riscv/dts/sg2002-milkv-duo256m.dtb make
+
+This will generate build/platform/generic/firmware/fw_dynamic.bin.
+
+3. Use the vendor-provided tool [1] to create a unified fip.bin file containing
+   FSBL, OpenSBI, and U-Boot.
+   Note that you will have to use the file cv181x.bin as the FSBL.
+
+4. Place the generated fip.bin file into the FAT partition of the SD card.
+
+5. Insert the SD card into the board and power it on.
+
+The board will automatically execute the FSBL from the fip.bin file.
+Subsequently, it will transition to OpenSBI, and finally, OpenSBI will invoke
+U-Boot.
+
+[1]: https://github.com/sophgo/fiptool
+
+Sample boot log from Milk-V 256M Duo board
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. code-block:: none
+
+  U-Boot 2026.07-00002-g0b690770386f-dirty (Jul 07 2026 - 13:33:36 -0300)milkv_duo_256m
+
+  DRAM:  256 MiB
+  Core:  20 devices, 13 uclasses, devicetree: separate
+  MMC:   mmc@4310000: 0
+  Loading Environment from nowhere... OK
+  In:    serial@4140000
+  Out:   serial@4140000
+  Err:   serial@4140000
+  Net:
+  Warning: ethernet@4070000 (eth0) using random MAC address - 0a:f3:23:40:7e:55
+  eth0: ethernet@4070000
+  Hit any key to stop autoboot: 0
+  milkv_duo_256m#
diff --git a/include/configs/milkv_duo_256m.h b/include/configs/milkv_duo_256m.h
new file mode 100644
index 00000000000..4d6678b9c84
--- /dev/null
+++ b/include/configs/milkv_duo_256m.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2026, Hiago De Franco <hfranco@baylibre.com>
+ *
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#define CFG_SYS_SDRAM_BASE	0x80000000
+
+#endif /* __CONFIG_H */

-- 
2.54.0

Re: [PATCH 2/2] board: sophgo: add support for Milk-V Duo 256M

[Yao Zi]

On Fri, Jul 10, 2026 at 01:33:56PM -0300, Hiago De Franco wrote:
> Add U-Boot support for Milk-V Duo 256M.
> 
> This board has a different SoC compared to the Milk-V Duo 64M, it uses
> the Sophgo SG2002 instead of the Sophgo CV1800B. Both SoCs share many
> common IP blocks, so this board reuses the existing cv1800b CPU support.
> 
> Link: https://milkv.io/docs/duo/getting-started/duo256m
> Signed-off-by: Hiago De Franco <hfranco@baylibre.com>
> ---
>  arch/riscv/Kconfig                             |  4 ++
>  arch/riscv/dts/Makefile                        |  1 +
>  arch/riscv/dts/sg2002-milkv-duo256m.dts        | 46 +++++++++++++++
>  board/sophgo/milkv_duo_256m/Kconfig            | 30 ++++++++++
>  board/sophgo/milkv_duo_256m/MAINTAINERS        |  5 ++
>  board/sophgo/milkv_duo_256m/Makefile           |  6 ++
>  board/sophgo/milkv_duo_256m/board.c            | 19 ++++++
>  board/sophgo/milkv_duo_256m/milkv_duo_256m.env |  8 +++
>  configs/milkv_duo_256m_defconfig               | 42 +++++++++++++
>  doc/board/sophgo/index.rst                     |  1 +
>  doc/board/sophgo/milkv_duo_256m.rst            | 82 ++++++++++++++++++++++++++
>  include/configs/milkv_duo_256m.h               | 12 ++++
>  12 files changed, 256 insertions(+)

...

> diff --git a/board/sophgo/milkv_duo_256m/board.c b/board/sophgo/milkv_duo_256m/board.c
> new file mode 100644
> index 00000000000..b8454e0a1e9
> --- /dev/null
> +++ b/board/sophgo/milkv_duo_256m/board.c
> @@ -0,0 +1,19 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2026, Hiago De Franco <hfranco@baylibre.com>
> + */
> +
> +#include <dm/lists.h>
> +
> +#include "../common/ethernet.h"
> +
> +int board_init(void)
> +{
> +	if (IS_ENABLED(CONFIG_SYSRESET_CV1800B))
> +		device_bind_driver(gd->dm_root, "cv1800b_sysreset", "sysreset", NULL);
> +
> +	if (IS_ENABLED(CONFIG_NET_LEGACY))
> +		cv1800b_ephy_init();
> +
> +	return 0;
> +}

This looks identical to milkv_duo/board.c, could we re-use it instead of
introducing a copy at least for now?

...

> diff --git a/doc/board/sophgo/milkv_duo_256m.rst b/doc/board/sophgo/milkv_duo_256m.rst
> new file mode 100644
> index 00000000000..671f3a0b964
> --- /dev/null
> +++ b/doc/board/sophgo/milkv_duo_256m.rst
> @@ -0,0 +1,82 @@
> +.. SPDX-License-Identifier: GPL-2.0+
> +
> +Milk-V Duo 256M
> +===============
> +
> +SG2002 RISC-V SoC
> +------------------
> +The SG2002 is a high-performance, low-power 64-bit RISC-V/ARM SoC from Sophgo.
> +
> +Mainline support
> +----------------
> +The support for following drivers are already enabled:
> +1. ns16550 UART Driver.
> +2. Synopsys Designware MSHC Driver

At least this part is not accurate, according to the log below,

...

> +Sample boot log from Milk-V 256M Duo board
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +.. code-block:: none
> +
> +  U-Boot 2026.07-00002-g0b690770386f-dirty (Jul 07 2026 - 13:33:36 -0300)milkv_duo_256m
> +
> +  DRAM:  256 MiB
> +  Core:  20 devices, 13 uclasses, devicetree: separate
> +  MMC:   mmc@4310000: 0
> +  Loading Environment from nowhere... OK
> +  In:    serial@4140000
> +  Out:   serial@4140000
> +  Err:   serial@4140000
> +  Net:
> +  Warning: ethernet@4070000 (eth0) using random MAC address - 0a:f3:23:40:7e:55

Ethernet is enabled, too. Please update the documentation to reflect the
support status.

Best regards,
Yao Zi