diff --git a/src/mainboard/asus/maximus_iv_gene-z/romstage.c b/src/mainboard/asus/maximus_iv_gene-z/romstage.c
new file mode 100644
index 0000000..75f9972
--- /dev/null
+++ b/src/mainboard/asus/maximus_iv_gene-z/romstage.c
@@ -0,0 +1,79 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017–2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <device/dram/ddr3.h>
+#include <northbridge/intel/sandybridge/raminit_native.h>
+#include <northbridge/intel/sandybridge/sandybridge.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+#include <superio/nuvoton/common/nuvoton.h>
+#include <superio/nuvoton/nct6776/nct6776.h>
+
+const struct southbridge_usb_port mainboard_usb_ports[] = {
+	{ 1, 0, 0 },
+	{ 1, 0, 0 },
+	{ 1, 0, 1 },
+	{ 1, 0, 1 },
+	{ 1, 0, 2 },
+	{ 1, 0, 2 },
+	{ 1, 0, 3 },
+	{ 1, 0, 3 },
+	{ 1, 0, 4 },
+	{ 1, 0, 4 },
+	{ 1, 0, 5 },
+	{ 1, 0, 5 },
+	{ 1, 0, 6 },
+	{ 1, 0, 6 },
+};
+
+void pch_enable_lpc(void)
+{
+	pci_or_config16(PCH_LPC_DEV, LPC_EN, CNF1_LPC_EN | KBC_LPC_EN);
+}
+
+void mainboard_rcba_config(void)
+{
+}
+
+void mainboard_early_init(int s3resume)
+{
+}
+
+void mainboard_config_superio(void)
+{
+	static const pnp_devfn_t GLOBAL_PSEUDO_DEV = PNP_DEV(0x2e, 0);
+	static const pnp_devfn_t ACPI_DEV = PNP_DEV(0x2e, NCT6776_ACPI);
+
+	nuvoton_pnp_enter_conf_state(GLOBAL_PSEUDO_DEV);
+
+	/* Select HWM/LED functions instead of floppy functions. */
+	pnp_write_config(GLOBAL_PSEUDO_DEV, 0x1c, 0x03);
+	pnp_write_config(GLOBAL_PSEUDO_DEV, 0x24, 0x24);
+
+	/* Power RAM in S3. */
+	pnp_set_logical_device(ACPI_DEV);
+	pnp_write_config(ACPI_DEV, 0xe4, 0x10);
+
+	nuvoton_pnp_exit_conf_state(GLOBAL_PSEUDO_DEV);
+}
+
+void mainboard_get_spd(spd_raw_data *spd, bool id_only)
+{
+	read_spd(&spd[0], 0x50, id_only);
+	read_spd(&spd[1], 0x51, id_only);
+	read_spd(&spd[2], 0x52, id_only);
+	read_spd(&spd[3], 0x53, id_only);
+}