add boards milkv-duo-python and milkv-duo256m-python

device/milkv-duo-python/boardconfig.sh

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+#!/bin/bash
+
+export MV_BOARD=milkv-duo-python
+export MV_BOARD_CPU=cv1800b
+export MV_VENDOR=milkv
+export MV_BUILD_ENV=milkvsetup.sh
+export MV_BOARD_LINK=cv1800b_milkv_duo_sd
+

device/milkv-duo-python/genimage.cfg

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+image boot.vfat {
+	vfat {
+		label = "boot"
+		files = {
+			"fip.bin",
+			"rawimages/boot.sd",
+		}
+	}
+	size = 128M
+}
+
+image rootfs.ext4 {
+	ext4 {
+		label = "rootfs"
+	}
+	size = 768M
+}
+
+image milkv-duo-python.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+                image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+
+	partition empty {
+		partition-type-uuid = 0657fd6d-a4ab-43c4-84e5-0933c84b4f4f
+		size = 256M
+	}
+}

device/milkv-duo-python/overlay

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+../milkv-duo/overlay

device/milkv-duo256m-python/boardconfig.sh

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+#!/bin/bash
+
+export MV_BOARD=milkv-duo256m-python
+export MV_BOARD_CPU=cv1812cp
+export MV_VENDOR=milkv
+export MV_BUILD_ENV=milkvsetup.sh
+export MV_BOARD_LINK=cv1812cp_milkv_duo256m_sd
+

device/milkv-duo256m-python/genimage.cfg

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+image boot.vfat {
+	vfat {
+		label = "boot"
+		files = {
+			"fip.bin",
+			"rawimages/boot.sd",
+		}
+	}
+	size = 128M
+}
+
+image rootfs.ext4 {
+	ext4 {
+		label = "rootfs"
+	}
+	size = 768M
+}
+
+image milkv-duo256m-python.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+                image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

device/milkv-duo256m-python/overlay

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+../milkv-duo256m/overlay/