board: Add rt-thread art-pi board support

All these files are add for support rt-thread art-pi board
- add board/st/stm32h750-art-pi, defconfig, header support for u-boot

for more information about art-pi, please goto:
https://art-pi.gitee.io/website/

Signed-off-by: dillon min <dillon.minfei@gmail.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

arch/arm/mach-stm32/stm32h7/Kconfig

@@ -6,7 +6,11 @@ config TARGET_STM32H743_DISCO
 config TARGET_STM32H743_EVAL
 	bool "STM32H743 Evaluation board"
 
+config TARGET_STM32H750_ART_PI
+	bool "STM32H750 ART Pi board"
+
 source "board/st/stm32h743-eval/Kconfig"
 source "board/st/stm32h743-disco/Kconfig"
+source "board/st/stm32h750-art-pi/Kconfig"
 
 endif

board/st/stm32h750-art-pi/Kconfig

@@ -0,0 +1,19 @@
+if TARGET_STM32H750_ART_PI
+
+config SYS_BOARD
+	string
+	default "stm32h750-art-pi"
+
+config SYS_VENDOR
+	string
+	default "st"
+
+config SYS_SOC
+	string
+	default "stm32h7"
+
+config SYS_CONFIG_NAME
+	string
+	default "stm32h750-art-pi"
+
+endif

board/st/stm32h750-art-pi/MAINTAINERS

@@ -0,0 +1,7 @@
+STM32H750 ART PI BOARD
+M:	Dillon Min <dillon.minfei@gmail.com>
+S:	Maintained
+F:	board/st/stm32h750-art-pi
+F:	include/configs/stm32h750-art-pi.h
+F:	configs/stm32h750-art-pi_defconfig
+F:	arch/arm/dts/stm32h7*

board/st/stm32h750-art-pi/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2021, RT-Thread - All Rights Reserved
+# Author(s): Dillon Min, <dillon.minfei@gmail.com> for RT-Thread.
+
+obj-y	:= stm32h750-art-pi.o

board/st/stm32h750-art-pi/stm32h750-art-pi.c

@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021, STMicroelectronics - All Rights Reserved
+ * Author(s): Dillon Min <dillon.minfei@gmail.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <init.h>
+#include <log.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
+	if (ret) {
+		debug("DRAM init failed: %d\n", ret);
+		return ret;
+	}
+
+	if (fdtdec_setup_mem_size_base() != 0)
+		ret = -EINVAL;
+
+	return ret;
+}
+
+int dram_init_banksize(void)
+{
+	fdtdec_setup_memory_banksize();
+
+	return 0;
+}
+
+int board_early_init_f(void)
+{
+	return 0;
+}
+
+u32 get_board_rev(void)
+{
+	return 0;
+}
+
+int board_late_init(void)
+{
+	return 0;
+}
+
+int board_init(void)
+{
+	gd->bd->bi_boot_params = gd->bd->bi_dram[0].start + 0x100;
+	return 0;
+}

configs/stm32h750-art-pi_defconfig

@@ -0,0 +1,51 @@
+CONFIG_ARM=y
+CONFIG_ARCH_STM32=y
+CONFIG_SYS_TEXT_BASE=0x90000000
+CONFIG_SYS_MALLOC_F_LEN=0xF00
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_ENV_SIZE=0x2000
+CONFIG_STM32H7=y
+CONFIG_TARGET_STM32H750_ART_PI=y
+CONFIG_DEFAULT_DEVICE_TREE="stm32h750i-art-pi"
+CONFIG_DISTRO_DEFAULTS=y
+CONFIG_BOOTDELAY=3
+CONFIG_AUTOBOOT_KEYED=y
+CONFIG_AUTOBOOT_PROMPT="Hit SPACE in %d seconds to stop autoboot.\n"
+CONFIG_AUTOBOOT_STOP_STR=" "
+# CONFIG_USE_BOOTCOMMAND is not set
+CONFIG_DEFAULT_FDT_FILE="stm32h750i-art-pi"
+# CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_BOARD_LATE_INIT=y
+CONFIG_SYS_PROMPT="U-Boot > "
+CONFIG_CMD_GPT=y
+CONFIG_CMD_MMC=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_TIMER=y
+CONFIG_CMD_EXT4_WRITE=y
+# CONFIG_ISO_PARTITION is not set
+CONFIG_OF_CONTROL=y
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+# CONFIG_NET is not set
+CONFIG_DM_MMC=y
+CONFIG_STM32_SDMMC2=y
+# CONFIG_PINCTRL_FULL is not set
+CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_BAUDRATE=2000000
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttySTM0,2000000 root=/dev/ram loglevel=8"
+CONFIG_BOOTCOMMAND="bootm 90080000"
+CONFIG_REQUIRE_SERIAL_CONSOLE=y
+CONFIG_SERIAL_PRESENT=y
+CONFIG_DM_SERIAL=y
+CONFIG_STM32_SERIAL=y
+CONFIG_FIT=y
+CONFIG_FIT_EXTERNAL_OFFSET=0x0
+CONFIG_FIT_ENABLE_SHA256_SUPPORT=y
+CONFIG_FIT_FULL_CHECK=y
+CONFIG_FIT_PRINT=y
+CONFIG_LEGACY_IMAGE_FORMAT=y
+CONFIG_SUPPORT_RAW_INITRD=y
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_DM_DMA=y

include/configs/stm32h750-art-pi.h

@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2021, STMicroelectronics - All Rights Reserved
+ * Author(s): Dillon Min <dillon.minfei@gmail.com>
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#include <config.h>
+#include <linux/sizes.h>
+
+/* For booting Linux, use the first 16MB of memory */
+#define CONFIG_SYS_BOOTMAPSZ		(SZ_16M + SZ_8M)
+
+#define CONFIG_SYS_FLASH_BASE		0x90000000
+#define CONFIG_SYS_INIT_SP_ADDR		0x24040000
+
+/*
+ * Configuration of the external SDRAM memory
+ */
+#define CONFIG_SYS_LOAD_ADDR		0xC1800000
+#define CONFIG_LOADADDR			0xC1800000
+
+#define CONFIG_SYS_HZ_CLOCK		1000000
+
+#define CONFIG_CMDLINE_TAG
+#define CONFIG_SETUP_MEMORY_TAGS
+#define CONFIG_INITRD_TAG
+#define CONFIG_REVISION_TAG
+
+#define CONFIG_SYS_MAXARGS		16
+#define CONFIG_SYS_MALLOC_LEN		(1 * 1024 * 1024)
+
+#define BOOT_TARGET_DEVICES(func) \
+	func(MMC, mmc, 0)
+
+#include <config_distro_bootcmd.h>
+#define CONFIG_EXTRA_ENV_SETTINGS				\
+			"kernel_addr_r=0xC0008000\0"		\
+			"fdtfile=stm32h750i-art-pi.dtb\0"	\
+			"fdt_addr_r=0xC0408000\0"		\
+			"scriptaddr=0xC0418000\0"		\
+			"pxefile_addr_r=0xC0428000\0" \
+			"ramdisk_addr_r=0xC0438000\0"		\
+			BOOTENV
+
+#endif /* __CONFIG_H */