diff --git a/src/mainboard/prodrive/hermes/smihandler.c b/src/mainboard/prodrive/hermes/smihandler.c
new file mode 100644
index 0000000000..50b8e8b0a0
--- /dev/null
+++ b/src/mainboard/prodrive/hermes/smihandler.c
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi.h>
+#include <cpu/x86/smm.h>
+#include <intelblocks/gpio.h>
+#include <intelblocks/smihandler.h>
+#include <soc/gpio.h>
+
+static const struct pad_config sgpio_table[] = {
+	PAD_CFG_GPO(GPP_F10, 0, DEEP),
+	PAD_CFG_GPO(GPP_F11, 0, DEEP),
+	PAD_CFG_GPO(GPP_F12, 0, DEEP),
+	PAD_CFG_GPO(GPP_F13, 0, DEEP),
+};
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	/*
+	 * Pull SGPIO pins low to prevent cross-powering the +5V rail
+	 * through the SATA backplane when the power supply is off.
+	 */
+	if (slp_typ >= ACPI_S3)
+		gpio_configure_pads(sgpio_table, ARRAY_SIZE(sgpio_table));
+}