apm821xx: add support for the Cisco Meraki MR24

This patch adds support for the Cisco Meraki MR24 Access point
to the apm821xx target.

Board:		MR24 - Meraki MR24 Cloud Managed Access Point
CPU:		APM82181 SoC 800 MHz (PLB=200 OPB=100 EBC=100)
Flash size:	32MiB
RAM Size:	128MiB
Wireless:	Atheros AR9380 5.0GHz + Atheros AR9380 2.4GHz
Ethernet ports:	1x Gigabit Atheros AR8035

WARNING: The serial port needs a TTL/RS-232 v3.3 level converter!

For flashing instructions, visit:
<https://github.com/riptidewave93/Openwrt-MR24/blob/master/README.md#flashing>

Signed-off-by: Chris Blake <chrisrblake93@gmail.com>

15 files changed, 722 insertions, 10 deletions

diff --git a/target/linux/apm821xx/Makefile b/target/linux/apm821xx/Makefile
index 5c530d3ca6..eb34a3b3dc 100644
--- a/target/linux/apm821xx/Makefile
+++ b/target/linux/apm821xx/Makefile
@@ -11,6 +11,7 @@ CPU_TYPE:=464fp
 FEATURES:=fpu dt gpio
 MAINTAINER:=Chris Blake <chrisrblake93@gmail.com>, \
 	    Christian Lamparter <chunkeey@gmail.com>
+SUBTARGETS:=nand
 
 KERNEL_PATCHVER:=4.4
 
diff --git a/target/linux/apm821xx/base-files/etc/board.d/01_leds b/target/linux/apm821xx/base-files/etc/board.d/01_leds
index eab8b59142..d5f4cc9478 100755
--- a/target/linux/apm821xx/base-files/etc/board.d/01_leds
+++ b/target/linux/apm821xx/base-files/etc/board.d/01_leds
@@ -8,6 +8,14 @@ board_config_update
 board=$(apm821xx_board_name)
 
 case "$board" in
+mr24)
+	ucidef_set_led_netdev "wan" "WAN" "mr24:green:wan" "eth0"
+	ucidef_set_led_wlan "wlan1" "WLAN1" "mr24:green:wifi1" "phy0assoc"
+	ucidef_set_led_wlan "wlan2" "WLAN2" "mr24:green:wifi2" "phy0assoc"
+	ucidef_set_led_wlan "wlan3" "WLAN3" "mr24:green:wifi3" "phy0assoc"
+	ucidef_set_led_wlan "wlan4" "WLAN4" "mr24:green:wifi4" "phy0tpt"
+	;;
+
 *)
 	;;
 esac
diff --git a/target/linux/apm821xx/base-files/etc/board.d/02_network b/target/linux/apm821xx/base-files/etc/board.d/02_network
index 7dbabec11d..4d53b2f64a 100755
--- a/target/linux/apm821xx/base-files/etc/board.d/02_network
+++ b/target/linux/apm821xx/base-files/etc/board.d/02_network
@@ -9,6 +9,9 @@ board_config_update
 board=$(apm821xx_board_name)
 
 case "$board" in
+mr24)
+	ucidef_set_interface_lan "eth0"
+	;;
 *)
 	ucidef_set_interfaces_lan_wan "eth0" "eth1"
 	;;
diff --git a/target/linux/apm821xx/base-files/etc/diag.sh b/target/linux/apm821xx/base-files/etc/diag.sh
index 4d6763879b..58301f836f 100755
--- a/target/linux/apm821xx/base-files/etc/diag.sh
+++ b/target/linux/apm821xx/base-files/etc/diag.sh
@@ -5,6 +5,10 @@
 
 get_status_led() {
 	case $(apm821xx_board_name) in
+	mr24)
+		status_led="mr24:green:power"
+		;;
+
 	*)
 		;;
 	esac
diff --git a/target/linux/apm821xx/base-files/lib/apm821xx.sh b/target/linux/apm821xx/base-files/lib/apm821xx.sh
index 8f15ced8ca..82f85c56be 100755
--- a/target/linux/apm821xx/base-files/lib/apm821xx.sh
+++ b/target/linux/apm821xx/base-files/lib/apm821xx.sh
@@ -10,6 +10,10 @@ apm821xx_board_detect() {
 	model=$(awk 'BEGIN{FS="[ \t]+:[ \t]"} /model/ {print $2}' /proc/cpuinfo)
 
 	case "$model" in
+	*"Meraki MR24 Access Point")
+		name="mr24"
+		;;
+
 	*)
 		name="unknown"
 		;;
diff --git a/target/linux/apm821xx/base-files/lib/preinit/05_set_iface_mac_apm821xx b/target/linux/apm821xx/base-files/lib/preinit/05_set_iface_mac_apm821xx
new file mode 100644
index 0000000000..5dc7175730
--- /dev/null
+++ b/target/linux/apm821xx/base-files/lib/preinit/05_set_iface_mac_apm821xx
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+. /lib/apm821xx.sh
+
+preinit_set_mac_address() {
+	case $(apm821xx_board_name) in
+		mr24)
+			mac_lan=$(mtd_get_mac_binary_ubi board-config 102)
+			[ -n "$mac_lan" ] && ifconfig eth0 hw ether "$mac_lan"
+			;;
+	esac
+}
+
+boot_hook_add preinit_main preinit_set_mac_address
diff --git a/target/linux/apm821xx/base-files/lib/upgrade/merakinand.sh b/target/linux/apm821xx/base-files/lib/upgrade/merakinand.sh
new file mode 100755
index 0000000000..5861d97f12
--- /dev/null
+++ b/target/linux/apm821xx/base-files/lib/upgrade/merakinand.sh
@@ -0,0 +1,65 @@
+#!/bin/sh
+#
+# Copyright (C) 2016 Chris Blake <chrisrblake93@gmail.com>
+#
+# Custom upgrade script for Meraki NAND devices (ex. MR24)
+# Based on merakinand.sh from the ar71xx target
+#
+. /lib/apm821xx.sh
+. /lib/functions.sh
+
+merakinand_do_kernel_check() {
+	local board_name="$1"
+	local tar_file="$2"
+	local image_magic_word=`(tar xf $tar_file sysupgrade-$board_name/kernel -O 2>/dev/null | dd bs=1 count=4 skip=0 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"')`
+
+	# What is our kernel magic string?
+	case "$board_name" in
+	"mr24")
+		[ "$image_magic_word" == "8e73ed8a" ] && {
+			echo "pass" && return 0
+		}
+		;;
+	esac
+
+	exit 1
+}
+
+merakinand_do_platform_check() {
+	local board_name="$1"
+	local tar_file="$2"
+	local control_length=`(tar xf $tar_file sysupgrade-$board_name/CONTROL -O | wc -c) 2> /dev/null`
+	local file_type="$(identify_tar $2 sysupgrade-$board_name/root)"
+	local kernel_magic="$(merakinand_do_kernel_check $1 $2)"
+
+	case "$board_name" in
+	"mr24")
+		[ "$control_length" = 0 -o "$file_type" != "squashfs" -o "$kernel_magic" != "pass" ] && {
+			echo "Invalid sysupgrade file for $board_name"
+			return 1
+		}
+		;;
+	*)
+		echo "Unsupported device $board_name";
+		return 1
+		;;
+	esac
+
+	return 0
+}
+
+merakinand_do_upgrade() {
+	local tar_file="$1"
+	local board_name="$(cat /tmp/sysinfo/board_name)"
+
+	# Do we need to do any platform tweaks?
+	case "$board_name" in
+	"mr24")
+		nand_do_upgrade $1
+		;;
+	*)
+		echo "Unsupported device $board_name";
+		exit 1
+		;;
+	esac
+}
diff --git a/target/linux/apm821xx/base-files/lib/upgrade/platform.sh b/target/linux/apm821xx/base-files/lib/upgrade/platform.sh
index 2406113bad..ddf775f4ae 100755
--- a/target/linux/apm821xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/apm821xx/base-files/lib/upgrade/platform.sh
@@ -11,6 +11,11 @@ platform_check_image() {
 	[ "$#" -gt 1 ] && return 1
 
 	case "$board" in
+	mr24)
+		merakinand_do_platform_check $board "$1"
+		return $?;
+		;;
+
 	*)
 		;;
 	esac
@@ -23,6 +28,10 @@ platform_pre_upgrade() {
 	local board=$(apm821xx_board_name)
 
 	case "$board" in
+	mr24)
+		merakinand_do_upgrade "$1"
+		;;
+
 	*)
 		;;
 	esac
diff --git a/target/linux/apm821xx/config-4.4 b/target/linux/apm821xx/config-4.4
index 31235996c8..1e82e26692 100644
--- a/target/linux/apm821xx/config-4.4
+++ b/target/linux/apm821xx/config-4.4
@@ -38,6 +38,7 @@ CONFIG_BOOKE=y
 CONFIG_BOOKE_WDT=y
 CONFIG_BOUNCE=y
 # CONFIG_CANYONLANDS is not set
+# CONFIG_IKAREM is not set
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_CLONE_BACKWARDS=y
 CONFIG_CMDLINE="rootfstype=squashfs noinitrd"
diff --git a/target/linux/apm821xx/dts/MR24.dts b/target/linux/apm821xx/dts/MR24.dts
new file mode 100644
index 0000000000..1e186e6f04
--- /dev/null
+++ b/target/linux/apm821xx/dts/MR24.dts
@@ -0,0 +1,433 @@
+/*
+ * Device Tree Source for Meraki MR24 (Ikarem)
+ *
+ * Copyright (C) 2016 Chris Blake <chrisrblake93@gmail.com>
+ *
+ * Based on Cisco Meraki GPL Release r23-20150601 MR24 DTS
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without
+ * any warranty of any kind, whether express or implied.
+ */
+
+/dts-v1/;
+
+/ {
+	#address-cells = <2>;
+	#size-cells = <1>;
+	model = "Meraki MR24 Access Point";
+	compatible = "meraki,ikarem";
+	dcr-parent = <&{/cpus/cpu@0}>;
+
+	aliases {
+		ethernet0 = &EMAC0;
+		serial0 = &UART0;
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			model = "PowerPC,apm821xx";
+			reg = <0x00000000>;
+			clock-frequency = <0>; /* Filled in by U-Boot */
+			timebase-frequency = <0>; /* Filled in by U-Boot */
+			i-cache-line-size = <32>;
+			d-cache-line-size = <32>;
+			i-cache-size = <32768>;
+			d-cache-size = <32768>;
+			dcr-controller;
+			dcr-access-method = "native";
+			next-level-cache = <&L2C0>;
+		};
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x00000000 0x00000000 0x00000000>; /* Filled in by U-Boot */
+	};
+
+	UIC0: interrupt-controller0 {
+		compatible = "ibm,uic";
+		interrupt-controller;
+		cell-index = <0>;
+		dcr-reg = <0x0c0 0x009>;
+		#address-cells = <0>;
+		#size-cells = <0>;
+		#interrupt-cells = <2>;
+	};
+
+	UIC1: interrupt-controller1 {
+		compatible = "ibm,uic";
+		interrupt-controller;
+		cell-index = <1>;
+		dcr-reg = <0x0d0 0x009>;
+		#address-cells = <0>;
+		#size-cells = <0>;
+		#interrupt-cells = <2>;
+		interrupts = <0x1e 0x4 0x1f 0x4>; /* cascade */
+		interrupt-parent = <&UIC0>;
+	};
+
+	UIC2: interrupt-controller2 {
+		compatible = "ibm,uic";
+		interrupt-controller;
+		cell-index = <2>;
+		dcr-reg = <0x0e0 0x009>;
+		#address-cells = <0>;
+		#size-cells = <0>;
+		#interrupt-cells = <2>;
+		interrupts = <0xa 0x4 0xb 0x4>; /* cascade */
+		interrupt-parent = <&UIC0>;
+	};
+
+	UIC3: interrupt-controller3 {
+		compatible = "ibm,uic";
+		interrupt-controller;
+		cell-index = <3>;
+		dcr-reg = <0x0f0 0x009>;
+		#address-cells = <0>;
+		#size-cells = <0>;
+		#interrupt-cells = <2>;
+		interrupts = <0x10 0x4 0x11 0x4>; /* cascade */
+		interrupt-parent = <&UIC0>;
+	};
+
+	/* KPH check the following */
+	OCM: ocm@400040000 {
+		compatible = "ibm,ocm";
+		status = "okay";
+		cell-index = <1>;
+		/* configured in U-Boot */
+		reg = <4 0x00040000 0x8000>; /* 32K */
+	};
+
+	SDR0: sdr {
+		compatible = "ibm,sdr-apm821xx";
+		dcr-reg = <0x00e 0x002>;
+	};
+
+	CPR0: cpr {
+		compatible = "ibm,cpr-apm821xx";
+		dcr-reg = <0x00c 0x002>;
+	};
+
+	L2C0: l2c {
+		compatible = "ibm,l2-cache-apm82181", "ibm,l2-cache";
+		dcr-reg = <0x020 0x008
+			   0x030 0x008>;
+		cache-line-size = <32>;
+		cache-size = <262144>;
+		interrupt-parent = <&UIC1>;
+		interrupts = <11 1>;
+	};
+
+	/* kph check the below */
+	CPM0: cpm {
+		compatible = "ibm,cpm-apm821xx", "ibm,cpm";
+		cell-index = <0>;
+		dcr-reg = <0x160 0x003>;
+		pm-cpu = <0x02000000>;
+		pm-doze = <0x302570F0>;
+		pm-nap = <0x302570F0>;
+		pm-deepsleep = <0x302570F0>;
+		pm-iic-device = <&IIC0>;
+		pm-emac-device = <&EMAC0>;
+	};
+
+	plb {
+		compatible = "ibm,plb4";
+		#address-cells = <2>;
+		#size-cells = <1>;
+		ranges;
+		clock-frequency = <0>; /* Filled in by U-Boot */
+
+		SDRAM0: sdram {
+			compatible = "ibm,sdram-apm821xx";
+			dcr-reg = <0x010 0x002>;
+		};
+
+		/* kph check the below */
+		CRYPTO: crypto@180000 {
+			compatible = "amcc,ppc460ex-crypto", "amcc,ppc4xx-crypto";
+			reg = <4 0x00180000 0x80400>;
+			interrupt-parent = <&UIC0>;
+			interrupts = <0x1d 0x4>;
+		};
+
+		/* kph check the below */
+		PKA: pka@114000 {
+			device_type = "pka";
+			compatible = "ppc4xx-pka", "amcc,ppc4xx-pka";
+			reg = <4 0x00114000 0x4000>;
+			interrupt-parent = <&UIC0>;
+			interrupts = <0x14 0x2>;
+		};
+
+		/* kph check the below */
+		TRNG: trng@110000 {
+			compatible = "ppc4xx-trng", "amcc,ppc460ex-rng";
+			reg = <4 0x00110000 0x50>;
+			interrupt-parent = <&UIC1>;
+			interrupts = <0x3 0x2>;
+		};
+
+		MAL0: mcmal {
+			compatible = "ibm,mcmal2";
+			descriptor-memory = "ocm";
+			dcr-reg = <0x180 0x062>;
+			num-tx-chans = <1>;
+			num-rx-chans = <1>;
+			#address-cells = <0>;
+			#size-cells = <0>;
+			interrupt-parent = <&UIC2>;
+			interrupts = <	/*TXEOB*/ 0x6 0x4
+					/*RXEOB*/ 0x7 0x4
+					/*SERR*/  0x3 0x4
+					/*TXDE*/  0x4 0x4
+					/*RXDE*/  0x5 0x4>;
+		};
+
+		POB0: opb {
+			compatible = "ibm,opb";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0xb0000000 0x00000004 0xb0000000 0x50000000>;
+			clock-frequency = <0>; /* Filled in by U-Boot */
+
+			EBC0: ebc {
+				compatible = "ibm,ebc";
+				dcr-reg = <0x012 0x002>;
+				#address-cells = <2>;
+				#size-cells = <1>;
+				clock-frequency = <0>; /* Filled in by U-Boot */
+				/* ranges property is supplied by U-Boot */
+				ranges = < 0x00000003 0x00000000 0xe0000000 0x8000000>;
+				interrupts = <0x6 0x4>;
+				interrupt-parent = <&UIC1>;
+
+				/* Ikarem has 32MB of NAND */
+				ndfc@1,0 {
+					compatible = "ibm,ndfc";
+					reg = <00000003 00000000 00000400>;
+					ccr = <0x00001000>;
+					bank-settings = <0x80002222>;
+					#address-cells = <1>;
+					#size-cells = <1>;
+					/* 32 MiB NAND Flash */
+					nand {
+						#address-cells = <1>;
+						#size-cells = <1>;
+						partition@0 {
+							label = "u-boot";
+							reg = <0x00000000 0x00170000>;
+							read-only;
+						};
+						partition@170000 {
+							label = "oops";
+							reg = <0x00170000 0x00010000>;
+						};
+						partition@180000 {
+							label = "ubi";
+							reg = <0x00180000 0x01e80000>;
+						};
+					};
+				};
+			};
+
+			UART0: serial@ef600400 {
+				device_type = "serial";
+				compatible = "ns16550";
+				reg = <0xef600400 0x00000008>;
+				virtual-reg = <0xef600400>;
+				clock-frequency = <0>; /* Filled in by U-Boot */
+				current-speed = <0>; /* Filled in by U-Boot */
+				interrupt-parent = <&UIC0>;
+				interrupts = <0x1 0x4>;
+			};
+
+			GPIO0: gpio@ef600b00 {
+				compatible = "ibm,ppc4xx-gpio";
+				reg = <0xef600b00 0x00000048>;
+				#gpio-cells = <2>;
+				gpio-controller;
+			};
+
+			gpio-leds {
+				compatible = "gpio-leds";
+				power-green {
+					label = "mr24:green:power";
+					gpios = <&GPIO0 18 1>;
+				};
+				power-orange {
+					label = "mr24:orange:power";
+					gpios = <&GPIO0 19 1>;
+				};
+				lan {
+					label = "mr24:green:wan";
+					gpios = <&GPIO0 17 1>;
+				};
+				ssi-0 {
+					label = "mr24:green:wifi1";
+					gpios = <&GPIO0 23 1>;
+				};
+				ssi-1 {
+					label = "mr24:green:wifi2";
+					gpios = <&GPIO0 22 1>;
+				};
+				ssi-2 {
+					label = "mr24:green:wifi3";
+					gpios = <&GPIO0 21 1>;
+				};
+				ssi-3 {
+					label = "mr24:green:wifi4";
+					gpios = <&GPIO0 20 1>;
+				};
+			};
+
+			gpio_keys_polled {
+				compatible = "gpio-keys-polled";
+				#address-cells = <1>;
+				#size-cells = <0>;
+				poll-interval = <60>;	/* 3 * 20 = 60ms */
+				autorepeat;
+				button@1 {
+					label = "Reset button";
+					linux,code = <0x198>; /* KEY_RESTART */
+					gpios = <&GPIO0 16 1>;
+				};
+			};
+
+			IIC0: i2c@ef600700 {
+				compatible = "ibm,iic";
+				reg = <0xef600700 0x00000014>;
+				interrupt-parent = <&UIC0>;
+				interrupts = <0x2 0x4>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				/* Boot ROM is at 0x52-0x53, do not touch */
+				/* Unknown chip at 0x6e, not sure what it is */
+			};
+
+			IIC1: i2c@ef600800 {
+				compatible = "ibm,iic";
+				reg = <0xef600800 0x00000014>;
+				interrupt-parent = <&UIC0>;
+				interrupts = <0x3 0x4>;
+			};
+
+			RGMII0: emac-rgmii@ef601500 {
+				compatible = "ibm,rgmii";
+				reg = <0xef601500 0x00000008>;
+				has-mdio;
+			};
+
+			TAH0: emac-tah@ef601350 {
+				compatible = "ibm,tah";
+				reg = <0xef601350 0x00000030>;
+			};
+
+			EMAC0: ethernet@ef600c00 {
+				device_type = "network";
+				compatible = "ibm,emac-apm821xx", "ibm,emac4sync";
+				interrupt-parent = <&EMAC0>;
+				interrupts = <0x0 0x1>;
+				#interrupt-cells = <1>;
+				#address-cells = <0>;
+				#size-cells = <0>;
+				interrupt-map = </*Status*/ 0x0 &UIC2 0x10 0x4
+						 /*Wake*/   0x1 &UIC2 0x14 0x4>;
+				reg = <0xef600c00 0x000000c4>;
+				local-mac-address = [000000000000]; /* Filled in by U-Boot */
+				mal-device = <&MAL0>;
+				mal-tx-channel = <0>;
+				mal-rx-channel = <0>;
+				cell-index = <0>;
+				max-frame-size = <9000>;
+				rx-fifo-size = <16384>;
+				tx-fifo-size = <2048>;
+				phy-mode = "rgmii";
+				phy-map = <0x00000000>;
+				rgmii-device = <&RGMII0>;
+				rgmii-channel = <0>;
+				tah-device = <&TAH0>;
+				tah-channel = <0>;
+				has-inverted-stacr-oc;
+				has-new-stacr-staopc;
+			};
+		};
+
+		PCIE0: pciex@d00000000 {
+			device_type = "pci";
+			#interrupt-cells = <1>;
+			#size-cells = <2>;
+			#address-cells = <3>;
+			compatible = "ibm,plb-pciex-apm821xx", "ibm,plb-pciex";
+			primary;
+			port = <0x0>; /* port number */
+			reg = <0x0000000d 0x00000000 0x20000000	/* Config space access */
+			       0x0000000c 0x08010000 0x00001000>;	/* Registers */
+			dcr-reg = <0x100 0x020>;
+			sdr-base = <0x300>;
+
+			/* Outbound ranges, one memory and one IO,
+			 * later cannot be changed
+			 */
+			ranges = <0x02000000 0x00000000 0x80000000 0x0000000e 0x00000000 0x00000000 0x80000000
+				  0x02000000 0x00000000 0x00000000 0x0000000f 0x00000000 0x00000000 0x00100000
+				  0x01000000 0x00000000 0x00000000 0x0000000f 0x80000000 0x00000000 0x00010000>;
+
+			/* Inbound 2GB range starting at 0 */
+			dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x0 0x80000000>;
+
+			/* This drives busses 40 to 0x7f */
+			bus-range = <0x40 0x7f>;
+
+			/* Legacy interrupts (note the weird polarity, the bridge seems
+			 * to invert PCIe legacy interrupts).
+			 * We are de-swizzling here because the numbers are actually for
+			 * port of the root complex virtual P2P bridge. But I want
+			 * to avoid putting a node for it in the tree, so the numbers
+			 * below are basically de-swizzled numbers.
+			 * The real slot is on idsel 0, so the swizzling is 1:1
+			 */
+			interrupt-map-mask = <0x0 0x0 0x0 0x7>;
+			interrupt-map = <
+				0x0 0x0 0x0 0x1 &UIC3 0xc 0x4 /* swizzled int A */
+				0x0 0x0 0x0 0x2 &UIC3 0xd 0x4 /* swizzled int B */
+				0x0 0x0 0x0 0x3 &UIC3 0xe 0x4 /* swizzled int C */
+				0x0 0x0 0x0 0x4 &UIC3 0xf 0x4 /* swizzled int D */>;
+		};
+
+		MSI: ppc4xx-msi@C10000000 {
+			compatible = "amcc,ppc4xx-msi", "ppc4xx-msi";
+			reg = < 0xC 0x10000000 0x100
+				0xC 0x10000000 0x100>;
+			sdr-base = <0x36C>;
+			msi-data = <0x00004440>;
+			msi-mask = <0x0000ffe0>;
+			interrupts =<0 1 2 3 4 5 6 7>;
+			interrupt-parent = <&MSI>;
+			#interrupt-cells = <1>;
+			#address-cells = <0>;
+			#size-cells = <0>;
+			msi-available-ranges = <0x0 0x100>;
+			interrupt-map = <
+				0 &UIC3 0x18 1
+				1 &UIC3 0x19 1
+				2 &UIC3 0x1A 1
+				3 &UIC3 0x1B 1
+				4 &UIC3 0x1C 1
+				5 &UIC3 0x1D 1
+				6 &UIC3 0x1E 1
+				7 &UIC3 0x1F 1
+			>;
+		};
+	};
+
+	chosen {
+		linux,stdout-path = "/plb/opb/serial@ef600400";
+	};
+};
diff --git a/target/linux/apm821xx/image/Makefile b/target/linux/apm821xx/image/Makefile
index 48ada70d3f..ba11bb22ee 100644
--- a/target/linux/apm821xx/image/Makefile
+++ b/target/linux/apm821xx/image/Makefile
@@ -4,19 +4,80 @@
 #
 include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/image.mk
+include $(INCLUDE_DIR)/host.mk
 
-IMAGE_PROFILE:=$(if $(PROFILE),$(PROFILE),Default)
-
-DEVICE_VARS += DTS IMAGE_SIZE
+DEVICE_VARS += DEVICE_DTS DEVICE_PROFILE IMAGE_SIZE DTB_SIZE
 
 define Device/Default
-  BOARDNAME :=
-  DEVICE_PROFILE = $$(BOARDNAME)
-  PROFILES = Default $$(DEVICE_PROFILE)
-  KERNEL_DEPENDS = $$(wildcard ../dts/$$(DTS).dts)
-  KERNEL := kernel-bin | lzma | uImage lzma
-  KERNEL_INITRAMFS := kernel-bin | lzma | uImage lzma
+  KERNEL_DEPENDS = $$(wildcard ../dts/$$(DEVICE_DTS).dts)
+  DEVICE_PROFILE :=
+  DEVICE_DTS :=
+  KERNEL_ENTRY := 0x00000000
+  KERNEL_LOADADDR := 0x00000000
+endef
+
+define Build/dtb
+	$(call Image/BuildDTB,../dts/$(DEVICE_DTS).dts,$@.dtb,,--space $(DTB_SIZE))
+endef
+
+ifeq ($(SUBTARGET),nand)
+
+define Image/cpiogz
+	( cd $(TARGET_DIR); find . | cpio -o -H newc | gzip -9n >$(KDIR_TMP)/$(IMG_PREFIX)-rootfs.cpio.gz )
+endef
+
+define Build/copy-file
+	cat "$(1)" > "$@"
+endef
+
+define Build/MerakiAdd-dtb
+	$(call Image/BuildDTB,../dts/$(DEVICE_DTS).dts,$@.dtb)
+	( \
+		dd if=$@.dtb bs=$(DTB_SIZE) conv=sync; \
+		dd if=$@ bs=$(BLOCKSIZE) conv=sync; \
+	) > $@.new
+	@mv $@.new $@
 endef
-TARGET_DEVICES += Default
+
+define Build/MerakiAdd-initramfs
+	$(call Image/cpiogz)
+
+	-$(STAGING_DIR_HOST)/bin/mkimage -A $(LINUX_KARCH) -O linux -T ramdisk \
+		-C gzip -n "$(PROFILE) rootfs" \
+		-d $(KDIR_TMP)/$(IMG_PREFIX)-rootfs.cpio.gz \
+		$(KDIR_TMP)/$(IMG_PREFIX)-uramdisk.image.gz
+
+	( \
+		dd if=$@ bs=1k conv=sync; \
+		dd if=$(KDIR_TMP)/$(IMG_PREFIX)-uramdisk.image.gz bs=$(BLOCKSIZE) conv=sync; \
+	) > $@.new
+	@mv $@.new $@
+endef
+
+define Build/MerakiNAND
+	-$(STAGING_DIR_HOST)/bin/mkmerakifw \
+		-B $(DEVICE_PROFILE) -s \
+		-i $@ \
+		-o $@.new
+	@cp $@.new $@
+endef
+
+define Device/mr24
+  DEVICE_TITLE := Cisco Meraki MR24
+  DEVICE_PACKAGES := kmod-spi-gpio kmod-ath9k wpad-mini
+  DEVICE_PROFILE := MR24
+  DEVICE_DTS := MR24
+  BLOCKSIZE := 64512
+  IMAGES := sysupgrade.tar
+  DTB_SIZE := 64512
+  KERNEL_SIZE := 2048k
+  IMAGE_SIZE := 8191k
+  KERNEL := kernel-bin | lzma | uImage lzma | MerakiAdd-dtb | MerakiNAND
+  KERNEL_INITRAMFS := copy-file $(KDIR)/vmlinux | lzma | uImage lzma | MerakiAdd-dtb | pad-to 2047k | MerakiAdd-initramfs | MerakiNAND
+  IMAGE/sysupgrade.tar := sysupgrade-nand
+endef
+TARGET_DEVICES += mr24
 
 $(eval $(call BuildImage))
+
+endif
diff --git a/target/linux/apm821xx/nand/config-default b/target/linux/apm821xx/nand/config-default
new file mode 100644
index 0000000000..582d1295bc
--- /dev/null
+++ b/target/linux/apm821xx/nand/config-default
@@ -0,0 +1,9 @@
+CONFIG_IKAREM=y
+CONFIG_MTD_UBI=y
+CONFIG_MTD_UBI_BEB_LIMIT=20
+CONFIG_MTD_UBI_BLOCK=y
+# CONFIG_MTD_UBI_FASTMAP is not set
+# CONFIG_MTD_UBI_GLUEBI is not set
+CONFIG_MTD_UBI_WL_THRESHOLD=4096
+CONFIG_UBIFS_FS=y
+# CONFIG_UBIFS_FS_ADVANCED_COMPR is not set
diff --git a/target/linux/apm821xx/nand/target.mk b/target/linux/apm821xx/nand/target.mk
new file mode 100644
index 0000000000..a7d88b87c5
--- /dev/null
+++ b/target/linux/apm821xx/nand/target.mk
@@ -0,0 +1,7 @@
+BOARDNAME:=Devices with NAND flash (Routers)
+FEATURES += nand pcie ramdisk squashfs usb
+
+define Target/Description
+	Build firmware images for APM821XX boards with NAND flash.
+	For routers like the MR24 or the WNDR4700.
+endef
diff --git a/target/linux/apm821xx/patches-4.4/002-powerpc_ibm_phy_add_ar8035.patch b/target/linux/apm821xx/patches-4.4/002-powerpc_ibm_phy_add_ar8035.patch
new file mode 100644
index 0000000000..b7316e15b3
--- /dev/null
+++ b/target/linux/apm821xx/patches-4.4/002-powerpc_ibm_phy_add_ar8035.patch
@@ -0,0 +1,62 @@
+From 0c13957a43a90b1522eb616f3c9967ec44e4da1d Mon Sep 17 00:00:00 2001
+From: Christian Lamparter <chunkeey@googlemail.com>
+Date: Tue, 3 May 2016 13:58:24 +0200
+Subject: [PATCH] drivers: net: emac: add Atheros AR8035 phy initialization
+ code
+To: netdev@vger.kernel.org
+
+This patch adds the phy initialization code for Qualcomm
+Atheros AR8035 phy. This configuration is found in the
+Cisco Meraki MR24.
+
+Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
+---
+ drivers/net/ethernet/ibm/emac/phy.c | 26 ++++++++++++++++++++++++++
+ 1 file changed, 26 insertions(+)
+
+diff --git a/drivers/net/ethernet/ibm/emac/phy.c b/drivers/net/ethernet/ibm/emac/phy.c
+index d3b9d10..5b88cc6 100644
+--- a/drivers/net/ethernet/ibm/emac/phy.c
++++ b/drivers/net/ethernet/ibm/emac/phy.c
+@@ -470,12 +470,38 @@ static struct mii_phy_def m88e1112_phy_def = {
+ 	.ops		= &m88e1112_phy_ops,
+ };
+ 
++static int ar8035_init(struct mii_phy *phy)
++{
++	phy_write(phy, 0x1d, 0x5); /* Address debug register 5 */
++	phy_write(phy, 0x1e, 0x2d47); /* Value copied from u-boot */
++	phy_write(phy, 0x1d, 0xb);    /* Address hib ctrl */
++	phy_write(phy, 0x1e, 0xbc20); /* Value copied from u-boot */
++
++	return 0;
++}
++
++static struct mii_phy_ops ar8035_phy_ops = {
++	.init		= ar8035_init,
++	.setup_aneg	= genmii_setup_aneg,
++	.setup_forced	= genmii_setup_forced,
++	.poll_link	= genmii_poll_link,
++	.read_link	= genmii_read_link,
++};
++
++static struct mii_phy_def ar8035_phy_def = {
++	.phy_id		= 0x004dd070,
++	.phy_id_mask	= 0xfffffff0,
++	.name		= "Atheros 8035 Gigabit Ethernet",
++	.ops		= &ar8035_phy_ops,
++};
++
+ static struct mii_phy_def *mii_phy_table[] = {
+ 	&et1011c_phy_def,
+ 	&cis8201_phy_def,
+ 	&bcm5248_phy_def,
+ 	&m88e1111_phy_def,
+ 	&m88e1112_phy_def,
++	&ar8035_phy_def,
+ 	&genmii_phy_def,
+ 	NULL
+ };
+-- 
+2.8.1
+
diff --git a/target/linux/apm821xx/patches-4.4/200-add-meraki-mr24-ikarem-support.patch b/target/linux/apm821xx/patches-4.4/200-add-meraki-mr24-ikarem-support.patch
new file mode 100644
index 0000000000..45892f272f
--- /dev/null
+++ b/target/linux/apm821xx/patches-4.4/200-add-meraki-mr24-ikarem-support.patch
@@ -0,0 +1,31 @@
+--- a/arch/powerpc/platforms/44x/Kconfig
++++ b/arch/powerpc/platforms/44x/Kconfig
+@@ -40,6 +40,19 @@ config EBONY
+ 	help
+ 	  This option enables support for the IBM PPC440GP evaluation board.
+
++config IKAREM
++	bool "Ikarem"
++	depends on 44x
++	default n
++	select PPC44x_SIMPLE
++	select APM821xx
++	select PCI_MSI
++	select PPC4xx_MSI
++	select PPC4xx_PCI_EXPRESS
++	select IBM_EMAC_RGMII
++	help
++	  This option enables support for the Cisco Meraki MR24 (Ikarem) Access Point.
++
+ config SAM440EP
+         bool "Sam440ep"
+ 	depends on 44x
+--- a/arch/powerpc/platforms/44x/ppc44x_simple.c
++++ b/arch/powerpc/platforms/44x/ppc44x_simple.c
+@@ -62,6 +62,7 @@ static char *board[] __initdata = {
+ 	"amcc,sequoia",
+ 	"amcc,taishan",
+ 	"amcc,yosemite",
++	"meraki,ikarem",
+ 	"mosaixtech,icon"
+ };