d1: add new target

This target adds support for the Allwinner D1 RISC-V based SoCs.

 - RISC-V single-core T-Head C906 (RV64GCV)
 - Tensilica HiFi4 DSP
 - DDR2/DDR3 support
 - 10/100/1000M ethernet
 - usual peripherals like USB2, SPI, I2C, PWM, etc.

Four boards are supported:
 - Dongshan Nezha STU
    - 512Mb RAM
    - ethernet

 - LicheePi RV Dock
    - 512Mb RAM
    - wireless-only (RTL8723DS)

 - MangoPi MQ-Pro
    - 512Mb RAM
    - there are pads available for an SPI flash
    - wireless-only (RTL8723DS)

 - Nezha D1
    - 512Mb/1Gb/2Gb RAM
    - 256Mb NAND flash
    - ethernet, wireless

Installation:
Standard SD-card installation via dd-ing the generated image to
an SD-card of at least 256Mb.

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

target/linux/d1/image/Config.in

@@ -0,0 +1,5 @@
+config D1_SD_BOOT_PARTSIZE
+	int "Boot (SD Card) filesystem partition size (in MB)"
+	depends on TARGET_d1
+	default 32
+

target/linux/d1/image/Makefile

@@ -0,0 +1,94 @@
+#
+# Copyright (C) 2023 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/image.mk
+
+FAT32_BLOCK_SIZE=1024
+FAT32_BLOCKS=$(shell echo $$(($(CONFIG_D1_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))
+
+KERNEL_LOADADDR:=0x40200000
+
+define Build/riscv-sdcard
+	rm -f $@.boot #$(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img
+	mkfs.fat $@.boot  -C $(FAT32_BLOCKS)
+
+	mcopy -i $@.boot $(STAGING_DIR_IMAGE)/$(DEVICE_NAME)-boot.scr ::boot.scr
+	mcopy -i $@.boot $(DTS_DIR)/$(DEVICE_DTS).dtb ::dtb
+	mcopy -i $@.boot $(IMAGE_KERNEL) ::Image
+
+	./gen_d1_sdcard_img.sh \
+		$@ \
+		$@.boot \
+		$(IMAGE_ROOTFS) \
+		$(CONFIG_D1_SD_BOOT_PARTSIZE) \
+		$(CONFIG_TARGET_ROOTFS_PARTSIZE) \
+		$(STAGING_DIR_IMAGE)/$(DEVICE_NAME)-u-boot-sunxi-with-spl.bin
+endef
+
+define Device/Default
+  PROFILES := Default
+  KERNEL_NAME := Image
+  KERNEL := kernel-bin
+  IMAGES := sdcard.img.gz
+  IMAGE/sdcard.img.gz := riscv-sdcard | append-metadata | gzip
+endef
+
+define Device/FitImageGzip
+	KERNEL_SUFFIX := -fit-uImage.itb
+	KERNEL = kernel-bin | gzip | fit gzip $$(DTS_DIR)/$$(DEVICE_DTS).dtb
+	KERNEL_NAME := Image
+endef
+
+define Device/FitImage
+	KERNEL_SUFFIX := -fit-uImage.itb
+	KERNEL = kernel-bin | fit none $$(DTS_DIR)/$$(DEVICE_DTS).dtb
+	KERNEL_NAME := Image
+endef
+
+define Device/dongshan_nezha_stu
+  $(call Device/Default)
+  DEVICE_VENDOR := Dongshan
+  DEVICE_MODEL := Nezha STU devkit
+  DEVICE_DTS := allwinner/sun20i-d1-dongshan-nezha-stu
+  UBOOT := dongshan_nezha_stu
+endef
+TARGET_DEVICES += dongshan_nezha_stu
+
+define Device/lichee_rv_dock
+  $(call Device/Default)
+  DEVICE_VENDOR := Sipeed
+  DEVICE_MODEL := LicheePi RV (dock)
+  DEVICE_DTS := allwinner/sun20i-d1-lichee-rv-dock
+  DEVICE_PACKAGES += kmod-rtl8723bs
+  UBOOT := lichee_rv_dock
+endef
+TARGET_DEVICES += lichee_rv_dock
+
+define Device/mangopi_mq_pro
+  $(call Device/Default)
+  DEVICE_VENDOR := MangoPi
+  DEVICE_MODEL := MQ Pro
+  DEVICE_DTS := allwinner/sun20i-d1-mangopi-mq-pro
+  DEVICE_PACKAGES += kmod-rtl8723bs
+  UBOOT := mangopi_mq_pro
+endef
+TARGET_DEVICES += mangopi_mq_pro
+
+define Device/nezha
+  $(call Device/Default)
+  DEVICE_VENDOR := Nezha
+  DEVICE_MODEL := D1
+  DEVICE_DTS := allwinner/sun20i-d1-nezha
+  UBOOT := nezha
+endef
+TARGET_DEVICES += nezha
+
+define Image/Build
+	$(call Image/Build/$(1),$(1))
+endef
+
+$(eval $(call BuildImage))

target/linux/d1/image/gen_d1_sdcard_img.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2013 OpenWrt.org
+
+set -ex
+[ $# -eq 6 ] || {
+    echo "SYNTAX: $0 <file> <bootfs image> <rootfs image> <bootfs size> <rootfs size> <u-boot image>"
+    exit 1
+}
+
+OUTPUT="$1"
+BOOTFS="$2"
+ROOTFS="$3"
+BOOTFSSIZE="$4"
+ROOTFSSIZE="$5"
+UBOOT="$6"
+
+ROOTFSPTOFFSET=$(($BOOTFSSIZE + 20 + 1))
+
+head=4
+sect=63
+
+set $(ptgen -o $OUTPUT -h $head -s $sect -l 1024 -t c -p ${BOOTFSSIZE}M@20M -t 83 -p ${ROOTFSSIZE}M@${ROOTFSPTOFFSET}M)
+
+BOOTOFFSET="$(($1 / 512))"
+BOOTSIZE="$(($2 / 512))"
+ROOTFSOFFSET="$(($3 / 512))"
+ROOTFSSIZE="$(($4 / 512))"
+
+dd bs=512 if="$UBOOT" of="$OUTPUT" seek=256 conv=notrunc
+dd bs=512 if="$BOOTFS" of="$OUTPUT" seek="$BOOTOFFSET" conv=notrunc
+dd bs=512 if="$ROOTFS" of="$OUTPUT" seek="$ROOTFSOFFSET" conv=notrunc