[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 at 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 at baylibre.com>