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diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -3437,6 +3437,7 @@
dev/virtio/pci/virtio_pci_modern.c optional virtio_pci
dev/virtio/mmio/virtio_mmio.c optional virtio_mmio
dev/virtio/mmio/virtio_mmio_acpi.c optional virtio_mmio acpi
+dev/virtio/mmio/virtio_mmio_cmdline.c optional virtio_mmio
dev/virtio/mmio/virtio_mmio_fdt.c optional virtio_mmio fdt
dev/virtio/mmio/virtio_mmio_if.m optional virtio_mmio
dev/virtio/network/if_vtnet.c optional vtnet
diff --git a/sys/dev/virtio/mmio/virtio_mmio_cmdline.c b/sys/dev/virtio/mmio/virtio_mmio_cmdline.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/virtio/mmio/virtio_mmio_cmdline.c
@@ -0,0 +1,150 @@
+/*-
+ * Copyright (c) 2022 Colin Percival
+ *
+ * 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/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/rman.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <dev/virtio/mmio/virtio_mmio.h>
+
+/* Parse <size>@<baseaddr>:<irq>[:<id>] and add a child. */
+static void
+parsearg(driver_t *driver, device_t parent, char * arg)
+{
+ device_t child;
+ char * p;
+ unsigned long sz;
+ unsigned long baseaddr;
+ unsigned long irq;
+ unsigned long id;
+
+ /* <size> */
+ sz = strtoul(arg, &p, 0);
+ if ((sz == 0) || (sz == ULONG_MAX))
+ goto bad;
+ switch (*p) {
+ case 'E': case 'e':
+ sz <<= 10;
+ /* FALLTHROUGH */
+ case 'P': case 'p':
+ sz <<= 10;
+ /* FALLTHROUGH */
+ case 'T': case 't':
+ sz <<= 10;
+ /* FALLTHROUGH */
+ case 'G': case 'g':
+ sz <<= 10;
+ /* FALLTHROUGH */
+ case 'M': case 'm':
+ sz <<= 10;
+ /* FALLTHROUGH */
+ case 'K': case 'k':
+ sz <<= 10;
+ p++;
+ break;
+ }
+
+ /* @<baseaddr> */
+ if (*p++ != '@')
+ goto bad;
+ baseaddr = strtoul(p, &p, 0);
+ if ((baseaddr == 0) || (baseaddr == ULONG_MAX))
+ goto bad;
+
+ /* :<irq> */
+ if (*p++ != ':')
+ goto bad;
+ irq = strtoul(p, &p, 0);
+ if ((irq == 0) || (irq == ULONG_MAX))
+ goto bad;
+
+ /* Optionally, :<id> */
+ if (*p) {
+ if (*p++ != ':')
+ goto bad;
+ id = strtoul(p, &p, 0);
+ if ((id == 0) || (id == ULONG_MAX))
+ goto bad;
+ } else {
+ id = 0;
+ }
+
+ /* Should have reached the end of the string. */
+ if (*p)
+ goto bad;
+
+ /* Create the child and assign its resources. */
+ child = BUS_ADD_CHILD(parent, 0, driver->name, id ? id : -1);
+ bus_set_resource(child, SYS_RES_MEMORY, 0, baseaddr, sz);
+ bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
+ device_set_driver(child, driver);
+
+ return;
+
+bad:
+ printf("Error parsing virtio_mmio parameter: %s\n", arg);
+}
+
+static void
+vtmmio_cmdline_identify(driver_t *driver, device_t parent)
+{
+ size_t n;
+ char name[] = "virtio_mmio.device_XXXX";
+ char * val;
+
+ /* First variable just has its own name. */
+ if ((val = kern_getenv("virtio_mmio.device")) == NULL)
+ return;
+ parsearg(driver, parent, val);
+ freeenv(val);
+
+ /* The rest have _%zu suffixes. */
+ for (n = 1; n <= 9999; n++) {
+ sprintf(name, "virtio_mmio.device_%zu", n);
+ if ((val = kern_getenv(name)) == NULL)
+ return;
+ parsearg(driver, parent, val);
+ freeenv(val);
+ }
+}
+
+static device_method_t vtmmio_cmdline_methods[] = {
+ /* Device interface. */
+ DEVMETHOD(device_identify, vtmmio_cmdline_identify),
+ DEVMETHOD(device_probe, vtmmio_probe),
+
+ DEVMETHOD_END
+};
+DEFINE_CLASS_1(virtio_mmio, vtmmio_cmdline_driver, vtmmio_cmdline_methods,
+ sizeof(struct vtmmio_softc), vtmmio_driver);
+DRIVER_MODULE(vtmmio_cmdline, nexus, vtmmio_cmdline_driver, 0, 0);

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