Add support for MT7622 reference board

This adds a general board file based on MT7622 SoCs from MediaTek.
This commit is adding the basic boot support for the MT7622 rfb.

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Reviewed-by: Ryder Lee <ryder.lee@mediatek.com>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
diff --git a/include/configs/mt7622.h b/include/configs/mt7622.h
new file mode 100644
index 0000000..dfd506e
--- /dev/null
+++ b/include/configs/mt7622.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Configuration for MediaTek MT7629 SoC
+ *
+ * Copyright (C) 2019 MediaTek Inc.
+ * Author: Sam Shih <sam.shih@mediatek.com>
+ */
+
+#ifndef __MT7622_H
+#define __MT7622_H
+
+#include <linux/sizes.h>
+
+#define CONFIG_SYS_MAXARGS		8
+#define CONFIG_SYS_BOOTM_LEN		SZ_64M
+#define CONFIG_SYS_CBSIZE		SZ_1K
+#define CONFIG_SYS_PBSIZE		(CONFIG_SYS_CBSIZE +	\
+					sizeof(CONFIG_SYS_PROMPT) + 16)
+/* Size of malloc() pool */
+#define CONFIG_SYS_MALLOC_LEN		SZ_4M
+#define CONFIG_SYS_NONCACHED_MEMORY	SZ_1M
+
+/* Allow to overwrite serial and ethaddr */
+#define CONFIG_ENV_OVERWRITE
+
+#define CONFIG_SYS_MMC_ENV_DEV 0
+
+/* Uboot definition */
+#define CONFIG_SYS_UBOOT_BASE                   CONFIG_SYS_TEXT_BASE
+
+/* SPL -> Uboot */
+#define CONFIG_SYS_UBOOT_START		CONFIG_SYS_TEXT_BASE
+#define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_TEXT_BASE + SZ_2M - \
+					 GENERATED_GBL_DATA_SIZE)
+/* UBoot -> Kernel */
+#define CONFIG_LOADADDR		        0x4007ff28
+#define CONFIG_SYS_LOAD_ADDR		CONFIG_LOADADDR
+
+/* DRAM */
+#define CONFIG_SYS_SDRAM_BASE		0x40000000
+
+/* Ethernet */
+#define CONFIG_IPADDR			192.168.1.1
+#define CONFIG_SERVERIP			192.168.1.3
+
+#endif