diff --git a/src/mainboard/google/rex/Makefile.inc b/src/mainboard/google/rex/Makefile.inc
new file mode 100644
index 0000000000..e0c4003b5a
--- /dev/null
+++ b/src/mainboard/google/rex/Makefile.inc
@@ -0,0 +1,10 @@
+bootblock-y += bootblock.c
+
+romstage-y += romstage.c
+
+ramstage-y += mainboard.c
+
+subdirs-y += variants/baseboard/$(BASEBOARD_DIR)
+
+CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/variants/baseboard/include
+CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/variants/baseboard/$(BASEBOARD_DIR)/include
diff --git a/src/mainboard/google/rex/bootblock.c b/src/mainboard/google/rex/bootblock.c
new file mode 100644
index 0000000000..8a7b93a968
--- /dev/null
+++ b/src/mainboard/google/rex/bootblock.c
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <bootblock_common.h>
+
+void bootblock_mainboard_init(void)
+{
+	/* TODO: Perform mainboard initialization */
+}
diff --git a/src/mainboard/google/rex/mainboard.c b/src/mainboard/google/rex/mainboard.c
new file mode 100644
index 0000000000..3dc2c41d69
--- /dev/null
+++ b/src/mainboard/google/rex/mainboard.c
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <device/device.h>
+
+static void mainboard_init(void *chip_info)
+{
+	/* TODO: Perform mainboard initialization */
+}
+
+static void mainboard_enable(struct device *dev)
+{
+	/* TODO: Enable mainboard */
+}
+
+struct chip_operations mainboard_ops = {
+	.init = mainboard_init,
+	.enable_dev = mainboard_enable,
+};
diff --git a/src/mainboard/google/rex/romstage.c b/src/mainboard/google/rex/romstage.c
new file mode 100644
index 0000000000..b8ad127cef
--- /dev/null
+++ b/src/mainboard/google/rex/romstage.c
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <fsp/api.h>
+#include <soc/romstage.h>
+
+void mainboard_memory_init_params(FSPM_UPD *memupd)
+{
+	/* TODO : Fill FSP-M memory params */
+}
diff --git a/src/mainboard/google/rex/variants/baseboard/include/baseboard/variants.h b/src/mainboard/google/rex/variants/baseboard/include/baseboard/variants.h
new file mode 100644
index 0000000000..d16d3dad53
--- /dev/null
+++ b/src/mainboard/google/rex/variants/baseboard/include/baseboard/variants.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __BASEBOARD_VARIANTS_H__
+#define __BASEBOARD_VARIANTS_H__
+
+#include <soc/gpio.h>
+#include <stdint.h>
+
+#endif /*__BASEBOARD_VARIANTS_H__ */
diff --git a/src/mainboard/google/rex/variants/baseboard/rex/include/baseboard/gpio.h b/src/mainboard/google/rex/variants/baseboard/rex/include/baseboard/gpio.h
new file mode 100644
index 0000000000..a708db11ad
--- /dev/null
+++ b/src/mainboard/google/rex/variants/baseboard/rex/include/baseboard/gpio.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __BASEBOARD_GPIO_H__
+#define __BASEBOARD_GPIO_H__
+
+#include <soc/gpe.h>
+#include <soc/gpio.h>
+
+#endif /* __BASEBOARD_GPIO_H__ */