Index: head/sys/arm/broadcom/bcm2835/bcm2835_machdep.c
===================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_machdep.c
+++ head/sys/arm/broadcom/bcm2835/bcm2835_machdep.c
@@ -58,6 +58,7 @@
 #include <dev/fdt/fdt_common.h>
 
 #include <arm/broadcom/bcm2835/bcm2835_wdog.h>
+#include <arm/broadcom/bcm2835/bcm2836_mp.h>
 
 #include "platform_if.h"
 
@@ -139,6 +140,11 @@
 	PLATFORMMETHOD(platform_late_init,	bcm2835_late_init),
 	PLATFORMMETHOD(platform_cpu_reset,	bcm2835_cpu_reset),
 
+#ifdef SMP
+	PLATFORMMETHOD(platform_mp_start_ap,	bcm2836_mp_start_ap),
+	PLATFORMMETHOD(platform_mp_setmaxid,	bcm2836_mp_setmaxid),
+#endif
+
 	PLATFORMMETHOD_END,
 };
 FDT_PLATFORM_DEF(bcm2836, "bcm2836", 0, "brcm,bcm2709", 0);
Index: head/sys/arm/broadcom/bcm2835/bcm2836_mp.h
===================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2836_mp.h
+++ head/sys/arm/broadcom/bcm2835/bcm2836_mp.h
@@ -0,0 +1,38 @@
+/*-
+ * Copyright (C) 2016 Emmanuel Vadot <manu@freebsd.org>
+ * All rights reserved.
+ *
+ * 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
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _BCM2836_MP_H_
+#define	_BCM2836_MP_H_
+
+void	bcm2836_mp_setmaxid(platform_t plat);
+void	bcm2836_mp_start_ap(platform_t plat);
+
+#endif /* _BCM2836_MP_H_ */
Index: head/sys/arm/broadcom/bcm2835/bcm2836_mp.c
===================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2836_mp.c
+++ head/sys/arm/broadcom/bcm2835/bcm2836_mp.c
@@ -45,6 +45,9 @@
 #include <machine/bus.h>
 #include <machine/fdt.h>
 #include <machine/intr.h>
+#include <machine/platformvar.h>
+
+#include <arm/broadcom/bcm2835/bcm2836_mp.h>
 
 #ifdef DEBUG
 #define	DPRINTF(fmt, ...) do {			\
@@ -77,7 +80,7 @@
 	bus_space_write_4(fdtbus_bs_tag, bs_periph, (addr), (val))
 
 void
-platform_mp_setmaxid(void)
+bcm2836_mp_setmaxid(platform_t plat)
 {
 
 	DPRINTF("platform_mp_setmaxid\n");
@@ -90,7 +93,7 @@
 }
 
 void
-platform_mp_start_ap(void)
+bcm2836_mp_start_ap(platform_t plat)
 {
 	uint32_t val;
 	int i, retry;
Index: head/sys/arm/conf/RPI2
===================================================================
--- head/sys/arm/conf/RPI2
+++ head/sys/arm/conf/RPI2
@@ -29,6 +29,7 @@
 options 	SCHED_ULE		# ULE scheduler
 options 	SMP			# Enable multiple cores
 options 	PLATFORM
+options 	PLATFORM_SMP
 
 # NFS root from boopt/dhcp
 #options 	BOOTP