Index: head/sys/conf/files.powerpc
===================================================================
--- head/sys/conf/files.powerpc
+++ head/sys/conf/files.powerpc
@@ -107,6 +107,7 @@
 powerpc/aim/moea64_native.c	optional	aim
 powerpc/aim/mp_cpudep.c		optional	aim
 powerpc/aim/slb.c		optional	aim powerpc64
+powerpc/amigaone/platform_amigaone.c	optional	amigaone
 powerpc/booke/locore.S		optional	booke no-obj
 powerpc/booke/booke_machdep.c	optional	booke
 powerpc/booke/machdep_e500.c	optional	booke_e500
Index: head/sys/conf/options.powerpc
===================================================================
--- head/sys/conf/options.powerpc
+++ head/sys/conf/options.powerpc
@@ -20,6 +20,8 @@
 GFB_NO_MODE_CHANGE	opt_gfb.h
 
 MOEA64_STATS		opt_pmap.h
+AMIGAONE		opt_platform.h
+MIKROTIK		opt_platform.h
 MPC85XX			opt_platform.h
 POWERMAC		opt_platform.h
 PS3			opt_platform.h
@@ -35,4 +37,3 @@
 # AGP debugging support
 AGP_DEBUG		opt_agp.h
 
-MIKROTIK
Index: head/sys/powerpc/amigaone/platform_amigaone.c
===================================================================
--- head/sys/powerpc/amigaone/platform_amigaone.c
+++ head/sys/powerpc/amigaone/platform_amigaone.c
@@ -0,0 +1,123 @@
+/*-
+ * Copyright (c) 2019 Justin Hibbits
+ *
+ * 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 ``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 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>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/malloc.h>
+#include <sys/smp.h>
+
+#include <machine/intr_machdep.h>
+#include <machine/platform.h>
+#include <machine/platformvar.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+
+#include <powerpc/mpc85xx/mpc85xx.h>
+
+#include "platform_if.h"
+
+static void aeon_pbutton_intr(void *_unused);
+static void aeon_setup_intr(void *unused);
+
+static int aeon_probe(platform_t);
+static int aeon_attach(platform_t);
+
+static platform_method_t aeon_methods[] = {
+	PLATFORMMETHOD(platform_probe,		aeon_probe),
+	PLATFORMMETHOD(platform_attach,		aeon_attach),
+	PLATFORMMETHOD_END
+};
+
+DEFINE_CLASS_1(aeon, aeon_platform, aeon_methods, 0, mpc85xx_platform);
+
+PLATFORM_DEF(aeon_platform);
+
+static bool is_aeon;
+
+static int
+aeon_probe(platform_t plat)
+{
+	phandle_t rootnode;
+	char model[32];
+
+	rootnode = OF_finddevice("/");
+
+	if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
+		if (strncmp(model, "varisys,", strlen("varisys,")) == 0)
+			return (BUS_PROBE_SPECIFIC);
+	}
+
+	return (ENXIO);
+}
+
+static int
+aeon_attach(platform_t plat)
+{
+	int error;
+
+	error = mpc85xx_attach(plat);
+	if (error)
+		return (error);
+
+	is_aeon = true;
+
+	return (0);
+}
+
+/* Notify devd(8) that the power button was pressed (IRQ#4 on A-Eon machines). */
+static void
+aeon_pbutton_intr(void *_unused)
+{
+	devctl_notify("AEON", "power", "press", NULL);
+}
+
+/* Manually configure the power button IRQ handler. */
+static void
+aeon_setup_intr(void *unused)
+{
+	int irq;
+
+	if (!is_aeon)
+		return;
+
+	if (bootverbose)
+		printf("Configuring AmigaOne power button.\n");
+
+	irq = 4; /* From TRM, IRQ4 is raised when power button is pressed. */
+
+	/* Get us the root PIC. */
+	irq = MAP_IRQ(0, irq);
+	powerpc_config_intr(irq, INTR_TRIGGER_EDGE, INTR_POLARITY_LOW);
+	powerpc_setup_intr("power_button", irq, NULL, aeon_pbutton_intr, NULL,
+	    INTR_TYPE_MISC, NULL, 0);
+}
+
+SYSINIT(aeon_setup_intr, SI_SUB_CONFIGURE, SI_ORDER_ANY, aeon_setup_intr, NULL);