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 <[email protected]> --- 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 <[email protected]> + */ + +/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"; + }; +}; + +ðernet0 { + 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 <[email protected]> +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 <[email protected]> + +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 <[email protected]> + */ + +#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 <[email protected]> + * + */ + +#ifndef __CONFIG_H +#define __CONFIG_H + +#define CFG_SYS_SDRAM_BASE 0x80000000 + +#endif /* __CONFIG_H */ -- 2.54.0
