diff --git a/target/linux/bcm53xx/patches-3.18/700-bgmac-add-support-for-the-3rd-bus-core-device.patch b/target/linux/bcm53xx/patches-3.18/700-bgmac-add-support-for-the-3rd-bus-core-device.patch
new file mode 100644
index 0000000000..18ee2f1cbe
--- /dev/null
+++ b/target/linux/bcm53xx/patches-3.18/700-bgmac-add-support-for-the-3rd-bus-core-device.patch
@@ -0,0 +1,68 @@
+From f5d5afc0b1402aae0f6a2350e43241603dbaff1e Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Wed, 13 May 2015 10:46:47 +0200
+Subject: [PATCH] bgmac: add support for the 3rd bus core (device)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+So far we were supporting up to 2 cores but recent devices (e.g. Netgear
+R8000) may use 3rd as well. Lower ones (1st, 2nd) are usually used for
+some offloading then.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+ drivers/net/ethernet/broadcom/bgmac.c | 28 +++++++++++++++++++++++-----
+ 1 file changed, 23 insertions(+), 5 deletions(-)
+
+diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
+index f66c416..0614cae 100644
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -1561,11 +1561,20 @@ static int bgmac_probe(struct bcma_device *core)
+ 	struct net_device *net_dev;
+ 	struct bgmac *bgmac;
+ 	struct ssb_sprom *sprom = &core->bus->sprom;
+-	u8 *mac = core->core_unit ? sprom->et1mac : sprom->et0mac;
++	u8 *mac;
+ 	int err;
+ 
+-	/* We don't support 2nd, 3rd, ... units, SPROM has to be adjusted */
+-	if (core->core_unit > 1) {
++	switch (core->core_unit) {
++	case 0:
++		mac = sprom->et0mac;
++		break;
++	case 1:
++		mac = sprom->et1mac;
++		break;
++	case 2:
++		mac = sprom->et2mac;
++		break;
++	default:
+ 		pr_err("Unsupported core_unit %d\n", core->core_unit);
+ 		return -ENOTSUPP;
+ 	}
+@@ -1600,8 +1609,17 @@ static int bgmac_probe(struct bcma_device *core)
+ 	}
+ 	bgmac->cmn = core->bus->drv_gmac_cmn.core;
+ 
+-	bgmac->phyaddr = core->core_unit ? sprom->et1phyaddr :
+-			 sprom->et0phyaddr;
++	switch (core->core_unit) {
++	case 0:
++		bgmac->phyaddr = sprom->et0phyaddr;
++		break;
++	case 1:
++		bgmac->phyaddr = sprom->et1phyaddr;
++		break;
++	case 2:
++		bgmac->phyaddr = sprom->et2phyaddr;
++		break;
++	}
+ 	bgmac->phyaddr &= BGMAC_PHY_MASK;
+ 	if (bgmac->phyaddr == BGMAC_PHY_MASK) {
+ 		bgmac_err(bgmac, "No PHY found\n");
+-- 
+1.8.4.5
+