board: ti: am654: a53: Add initial support for am654

Add initial support for AM654 based EVM running on A53. Enable
4GB of DDR available on the EVM so that kernel DTB file
can be updated accordingly.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[Andreas: Added 4GB ddr support]
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
diff --git a/board/ti/am65x/Kconfig b/board/ti/am65x/Kconfig
new file mode 100644
index 0000000..5916004
--- /dev/null
+++ b/board/ti/am65x/Kconfig
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
+#	Lokesh Vutla <lokeshvutla@ti.com>
+
+choice
+	prompt "K3 AM65 based boards"
+	optional
+
+config TARGET_AM654_A53_EVM
+	bool "TI K3 based AM654 EVM running on A53"
+	select ARM64
+	select SOC_K3_AM6
+
+endchoice
+
+if TARGET_AM654_A53_EVM
+
+config SYS_BOARD
+       default "am65x"
+
+config SYS_VENDOR
+       default "ti"
+
+config SYS_CONFIG_NAME
+       default "am65x_evm"
+
+endif