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diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -758,6 +758,7 @@
dev/acpi_support/acpi_hp.c optional acpi_hp acpi
dev/acpi_support/acpi_ibm.c optional acpi_ibm acpi
dev/acpi_support/acpi_panasonic.c optional acpi_panasonic acpi
+dev/acpi_support/acpi_sbl_wmi.c optional acpi_sbl_wmi acpi
dev/acpi_support/acpi_sony.c optional acpi_sony acpi
dev/acpi_support/acpi_toshiba.c optional acpi_toshiba acpi
dev/acpi_support/atk0110.c optional aibs acpi
diff --git a/sys/dev/acpi_support/acpi_sbl_wmi.c b/sys/dev/acpi_support/acpi_sbl_wmi.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/acpi_support/acpi_sbl_wmi.c
@@ -0,0 +1,193 @@
+/*-
+ * Copyright (c) 2024 Rubicon Communications, LLC (Netgate)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include "opt_acpi.h"
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/uio.h>
+#include <sys/proc.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/sbuf.h>
+#include <sys/module.h>
+#include <sys/sysctl.h>
+
+#include <contrib/dev/acpica/include/acpi.h>
+#include <contrib/dev/acpica/include/accommon.h>
+#include <dev/acpica/acpivar.h>
+#include "acpi_wmi_if.h"
+
+#define _COMPONENT ACPI_OEM
+ACPI_MODULE_NAME("SBL-FW-UPDATE-WMI")
+ACPI_SERIAL_DECL(sbl_wmi, "SBL WMI device");
+
+#define ACPI_SBL_FW_UPDATE_WMI_GUID "44FADEB1-B204-40F2-8581-394BBDC1B651"
+
+struct acpi_sbl_wmi_softc {
+ device_t dev;
+ device_t wmi_dev;
+};
+
+static void
+acpi_sbl_wmi_identify(driver_t *driver, device_t parent)
+{
+ /* Don't do anything if driver is disabled. */
+ if (acpi_disabled("sbl_wmi"))
+ return;
+
+ /* Add only a single device instance. */
+ if (device_find_child(parent, "acpi_sbl_wmi", -1) != NULL)
+ return;
+
+ /* Check management GUID to see whether system is compatible. */
+ if (!ACPI_WMI_PROVIDES_GUID_STRING(parent,
+ ACPI_SBL_FW_UPDATE_WMI_GUID))
+ return;
+
+ if (BUS_ADD_CHILD(parent, 0, "acpi_sbl_wmi", -1) == NULL)
+ device_printf(parent, "add acpi_sbl_wmi child failed\n");
+}
+
+static int
+acpi_sbl_wmi_probe(device_t dev)
+{
+ if (!ACPI_WMI_PROVIDES_GUID_STRING(device_get_parent(dev),
+ ACPI_SBL_FW_UPDATE_WMI_GUID))
+ return (EINVAL);
+ device_set_desc(dev, "SBL Firmware Update WMI device");
+ return (0);
+}
+
+static int
+acpi_sbl_wmi_sysctl_get(struct acpi_sbl_wmi_softc *sc, int *val)
+{
+ ACPI_OBJECT *obj;
+ ACPI_BUFFER out = { ACPI_ALLOCATE_BUFFER, NULL };
+ int error = 0;
+
+ if (ACPI_FAILURE(ACPI_WMI_GET_BLOCK(sc->wmi_dev,
+ ACPI_SBL_FW_UPDATE_WMI_GUID, 0, &out))) {
+ error = EINVAL;
+ goto out;
+ }
+
+ obj = out.Pointer;
+ if (obj->Type != ACPI_TYPE_INTEGER) {
+ error = EINVAL;
+ goto out;
+ }
+
+ *val = obj->Integer.Value;
+
+out:
+ if (out.Pointer)
+ AcpiOsFree(out.Pointer);
+
+ return (error);
+}
+
+static int
+acpi_sbl_wmi_sysctl_set(struct acpi_sbl_wmi_softc *sc, int in)
+{
+ ACPI_BUFFER input = { ACPI_ALLOCATE_BUFFER, NULL };
+ uint32_t val;
+
+ val = in;
+ input.Length = sizeof(val);
+ input.Pointer = &val;
+
+ if (ACPI_FAILURE(ACPI_WMI_SET_BLOCK(sc->wmi_dev,
+ ACPI_SBL_FW_UPDATE_WMI_GUID, 0, &input)))
+ return (ENODEV);
+
+ return (0);
+}
+
+static int
+acpi_sbl_wmi_fw_upgrade_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct acpi_sbl_wmi_softc *sc;
+ int arg;
+ int error = 0;
+
+ ACPI_SERIAL_BEGIN(sbl_wmi);
+
+ sc = (struct acpi_sbl_wmi_softc *)oidp->oid_arg1;
+ error = acpi_sbl_wmi_sysctl_get(sc, &arg);
+ if (error != 0)
+ goto out;
+
+ error = sysctl_handle_int(oidp, &arg, 0, req);
+ if (! error && req->newptr != NULL)
+ error = acpi_sbl_wmi_sysctl_set(sc, arg);
+
+out:
+ ACPI_SERIAL_END(sbl_wmi);
+
+ return (error);
+}
+
+static int
+acpi_sbl_wmi_attach(device_t dev)
+{
+ struct acpi_sbl_wmi_softc *sc;
+ struct sysctl_ctx_list *sysctl_ctx;
+ struct sysctl_oid *sysctl_tree;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+ sc->wmi_dev = device_get_parent(dev);
+
+ sysctl_ctx = device_get_sysctl_ctx(dev);
+ sysctl_tree = device_get_sysctl_tree(dev);
+
+ SYSCTL_ADD_PROC(sysctl_ctx,
+ SYSCTL_CHILDREN(sysctl_tree), OID_AUTO,
+ "firmware_update_request",
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+ sc, 0, acpi_sbl_wmi_fw_upgrade_sysctl, "I",
+ "Signal SBL that a firmware update is available");
+
+ return (0);
+}
+
+static device_method_t acpi_sbl_wmi_methods[] = {
+ DEVMETHOD(device_identify, acpi_sbl_wmi_identify),
+ DEVMETHOD(device_probe, acpi_sbl_wmi_probe),
+ DEVMETHOD(device_attach, acpi_sbl_wmi_attach),
+
+ DEVMETHOD_END
+};
+
+static driver_t acpi_sbl_wmi_driver = {
+ "acpi_sbl_wmi",
+ acpi_sbl_wmi_methods,
+ sizeof(struct acpi_sbl_wmi_softc),
+};
+
+DRIVER_MODULE(acpi_sbl_wmi, acpi_wmi, acpi_sbl_wmi_driver, 0, 0);
+MODULE_DEPEND(acpi_sbl_wmi, acpi_wmi, 1, 1, 1);
+MODULE_DEPEND(acpi_sbl_wmi, acpi, 1, 1, 1);
diff --git a/sys/modules/acpi/Makefile b/sys/modules/acpi/Makefile
--- a/sys/modules/acpi/Makefile
+++ b/sys/modules/acpi/Makefile
@@ -1,5 +1,5 @@
SUBDIR= acpi_asus acpi_asus_wmi acpi_dock acpi_fujitsu acpi_hp \
- acpi_ged acpi_ibm acpi_panasonic acpi_sony acpi_toshiba \
- acpi_video acpi_wmi aibs
+ acpi_ged acpi_ibm acpi_panasonic acpi_sbl_wmi acpi_sony \
+ acpi_toshiba acpi_video acpi_wmi aibs
.include <bsd.subdir.mk>
diff --git a/sys/modules/acpi/acpi_sbl_wmi/Makefile b/sys/modules/acpi/acpi_sbl_wmi/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/acpi/acpi_sbl_wmi/Makefile
@@ -0,0 +1,7 @@
+.PATH: ${SRCTOP}/sys/dev/acpi_support
+
+KMOD= acpi_sbl_wmi
+CFLAGS+=-I${SRCTOP}/sys/dev/acpi_support
+SRCS= acpi_sbl_wmi.c opt_acpi.h acpi_if.h acpi_wmi_if.h device_if.h bus_if.h
+
+.include <bsd.kmod.mk>
diff --git a/sys/x86/conf/NOTES b/sys/x86/conf/NOTES
--- a/sys/x86/conf/NOTES
+++ b/sys/x86/conf/NOTES
@@ -172,6 +172,9 @@
# ACPI Panasonic Extras (LCD backlight/brightness, video output, etc.)
device acpi_panasonic
+# ACPI SBL Firmware Update
+device acpi_sbl_wmi
+
# ACPI Sony extra (LCD brightness)
device acpi_sony

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