riscv: sophgo: milkv_duo: initial support added

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>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

4 files changed, 48 insertions, 0 deletions

diff --git a/board/sophgo/milkv_duo/Kconfig b/board/sophgo/milkv_duo/Kconfig
new file mode 100644
index 00000000000..2a458f291cc
--- /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 00000000000..651a0592f7a
--- /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 00000000000..a087013f5c6
--- /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 00000000000..eaa47be1739
--- /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;
+}