arm: nuvoton: Add support for Nuvoton NPCM845 BMC

Add basic support for the Nuvoton NPCM845 EVB (Arbel).

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>

board/nuvoton/arbel_evb/Kconfig

@@ -0,0 +1,18 @@
+if TARGET_ARBEL_EVB
+
+config SYS_BOARD
+	default "arbel_evb"
+
+config SYS_VENDOR
+	default "nuvoton"
+
+config SYS_CONFIG_NAME
+	default "arbel"
+
+config SYS_MEM_TOP_HIDE
+	hex "Reserved TOP memory"
+	default 0xB000000
+	help
+	  Reserve memory for ECC/GFX/VCD/ECE.
+
+endif

board/nuvoton/arbel_evb/MAINTAINERS

@@ -0,0 +1,7 @@
+Arbel EVB
+M:	Stanley Chu <yschu@nuvoton.com>
+M:	Jim Liu <JJLIU0@nuvoton.com>
+S:	Maintained
+F:	board/nuvoton/arbel_evb/
+F:	include/configs/arbel.h
+F:	configs/arbel_evb_defconfig

board/nuvoton/arbel_evb/Makefile

@@ -0,0 +1 @@
+obj-y	+= arbel_evb.o

board/nuvoton/arbel_evb/arbel_evb.c

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2022 Nuvoton Technology Corp.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <asm/arch/gcr.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_init(void)
+{
+	return 0;
+}
+
+int dram_init(void)
+{
+	struct npcm_gcr *gcr = (struct npcm_gcr *)NPCM_GCR_BA;
+
+	/*
+	 * Get dram size from bootblock.
+	 * The value is stored in scrpad_02 register.
+	 */
+	gd->ram_size = readl(&gcr->scrpad_b);
+
+	return 0;
+}