x86: Add chromebook_coral

Add support for coral which is a range of Apollo Lake-based Chromebook
released in 2017. This also includes reef released in 2016, since it is
based on the same SoC.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

include/configs/chromebook_coral.h

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019 Google LLC
+ */
+
+/*
+ * board/config.h - configuration options, board-specific
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#define CONFIG_BOOTCOMMAND	\
+	"fatload mmc 1:c 1000000 syslinux/vmlinuz.A; zboot 1000000"
+
+#include <configs/x86-common.h>
+#include <configs/x86-chromebook.h>
+
+#undef CONFIG_STD_DEVICES_SETTINGS
+#define CONFIG_STD_DEVICES_SETTINGS     "stdin=usbkbd,i8042-kbd,serial\0" \
+					"stdout=vidconsole,serial\0" \
+					"stderr=vidconsole,serial\0"
+
+#define CONFIG_ENV_SECT_SIZE		0x1000
+#define CONFIG_ENV_OFFSET		0x003f8000
+
+#define CONFIG_TPL_TEXT_BASE		0xffff8000
+
+#define CONFIG_SYS_NS16550_MEM32
+#undef CONFIG_SYS_NS16550_PORT_MAPPED
+
+#endif	/* __CONFIG_H */