Bringing OpenWRT to TL-WA801ND v2 (Part 2, Building OpenWRT)

After getting some details about the board it was time to create a build environment. In my case this was just about copying one of the VMs I have prepared just for this purpose. The build environment requires a Linux machine whereas it doesn’t really matter which flavour it is. After everything is set on the VM the very first step is to create a user under which the build will be performed. I created a user ‘openwrt‘ for this and switched user to it. As user openwrt the following commands needed to be executed:

git clone git://git.openwrt.org/12.09/openwrt.git
cd openwrt
./scripts/feeds update
make menuconfig
make

I.e. getting the source, changing into the source directory and updating the feeds (the add-on packages). The ‘make menuconfig’ might not be necessary because everything is already set up for the AR71xx platform. If not configure appropriately. More details about the build system can be found on the developer site of OpenWRT.

The first build ran smooth without any errors or warnings in my case.

I’ve gone through several iterations and even failed attempts to create a working image for the TL-WA801ND after that but ended up with a working source. The patches that were needed and which can be applied to the 12.09 tree are as follows:

diff --git a/target/linux/ar71xx/base-files/etc/diag.sh b/target/linux/ar71xx/base-files/etc/diag.sh
index 416322d..af4dd9e 100755
--- a/target/linux/ar71xx/base-files/etc/diag.sh
+++ b/target/linux/ar71xx/base-files/etc/diag.sh
@@ -127,6 +127,7 @@ get_status_led() {
         ;;
     tl-mr3220 | \
     tl-mr3420 | \
+    tl-wa801nd-v2 | \
     tl-wa901nd | \
     tl-wa901nd-v2 | \
     tl-wr1041n-v2 | \
diff --git a/target/linux/ar71xx/base-files/etc/uci-defaults/leds b/target/linux/ar71xx/base-files/etc/uci-defaults/leds
index 7be4ce9..fc6ea05 100755
--- a/target/linux/ar71xx/base-files/etc/uci-defaults/leds
+++ b/target/linux/ar71xx/base-files/etc/uci-defaults/leds
@@ -122,6 +122,11 @@ tl-wa901nd)
     ucidef_set_led_netdev "lan" "LAN" "tp-link:green:lan" "eth0"
     ;;

+tl-wa801nd-v2)
+    ucidef_set_led_wlan "wlan" "WLAN" "tp-link:green:wlan" "phy0tpt"
+    ucidef_set_led_netdev "lan" "LAN" "tp-link:green:lan"  "eth0"
+    ;;
+
 tl-wa901nd-v2)
     ucidef_set_led_wlan "wlan" "WLAN" "tp-link:green:wlan" "phy0tpt"
     ;;
diff --git a/target/linux/ar71xx/base-files/etc/uci-defaults/network b/target/linux/ar71xx/base-files/etc/uci-defaults/network
index 7fa219d..6463961 100755
--- a/target/linux/ar71xx/base-files/etc/uci-defaults/network
+++ b/target/linux/ar71xx/base-files/etc/uci-defaults/network
@@ -156,6 +156,7 @@ rb-411 |\
 tl-mr11u |\
 tl-mr3020 |\
 tl-mr3040 |\
+tl-wa801nd-v2 |\
 tl-wa901nd |\
 tl-wa901nd-v2 |\
 tl-wr703n |\
diff --git a/target/linux/ar71xx/base-files/lib/ar71xx.sh b/target/linux/ar71xx/base-files/lib/ar71xx.sh
index 2bc8194..63464e5 100755
--- a/target/linux/ar71xx/base-files/lib/ar71xx.sh
+++ b/target/linux/ar71xx/base-files/lib/ar71xx.sh
@@ -93,6 +93,9 @@ tplink_board_detect() {
     "084200"*)
         model="TP-Link TL-WR842N/ND"
         ;;
+    "080100"*)
+        model="TP-Link TL-WA801N/ND"
+        ;;
     "090100"*)
         model="TP-Link TL-WA901N/ND"
         ;;
@@ -351,6 +354,9 @@ ar71xx_board_detect() {
     *TL-WA7510N)
         name="tl-wa7510n"
         ;;
+    *"TL-WA801N/ND v2")
+        name="tl-wa801nd-v2"
+        ;;
     *TL-WA901ND)
         name="tl-wa901nd"
         ;;
diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index 49b1de9..5ac55ed 100755
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -153,6 +153,7 @@ platform_check_image() {
     tl-mr3220 | \
     tl-mr3420 | \
     tl-wa7510n | \
+    tl-wa801nd-v2 | \
     tl-wa901nd | \
     tl-wa901nd-v2 | \
     tl-wdr4300 | \
diff --git a/target/linux/ar71xx/config-3.3 b/target/linux/ar71xx/config-3.3
index 446f202..3e556c1 100644
--- a/target/linux/ar71xx/config-3.3
+++ b/target/linux/ar71xx/config-3.3
@@ -58,6 +58,7 @@ CONFIG_ATH79_MACH_TEW_712BR=y
 CONFIG_ATH79_MACH_TL_MR11U=y
 CONFIG_ATH79_MACH_TL_MR3020=y
 CONFIG_ATH79_MACH_TL_MR3X20=y
+CONFIG_ATH79_MACH_TL_WA801ND_V2=y
 CONFIG_ATH79_MACH_TL_WA901ND=y
 CONFIG_ATH79_MACH_TL_WA901ND_V2=y
 CONFIG_ATH79_MACH_TL_WDR4300=y
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wa801nd-v2.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wa801nd-v2.c
index e69de29..7444b26 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wa801nd-v2.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wa801nd-v2.c
@@ -0,0 +1,115 @@
+/*
+ *  TP-LINK TL-WA801N/ND v2 board support
+ *
+ *  Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+
+#include "common.h"
+#include "dev-eth.h"
+#include "dev-gpio-buttons.h"
+#include "dev-leds-gpio.h"
+#include "dev-m25p80.h"
+#include "dev-wmac.h"
+#include "machtypes.h"
+
+#define TL_WA801ND_V2_GPIO_LED_WLAN    13
+#define TL_WA801ND_V2_GPIO_LED_QSS    15
+#define TL_WA801ND_V2_GPIO_LED_LAN    18
+#define TL_WA801ND_V2_GPIO_LED_SYSTEM    14
+
+#define TL_WA801ND_V2_GPIO_BTN_RESET    17
+#define TL_WA801ND_V2_GPIO_SW_RFKILL    16
+
+#define TL_WA801ND_V2_KEYS_POLL_INTERVAL    20    /* msecs */
+#define TL_WA801ND_V2_KEYS_DEBOUNCE_INTERVAL (3 * TL_WA801ND_V2_KEYS_POLL_INTERVAL)
+
+static const char *tl_wa801nd_v2_part_probes[] = {
+    "tp-link",
+    NULL,
+};
+
+static struct flash_platform_data tl_wa801nd_v2_flash_data = {
+    .part_probes    = tl_wa801nd_v2_part_probes,
+};
+
+static struct gpio_led tl_wa801nd_v2_leds_gpio[] __initdata = {
+    {
+        .name        = "tp-link:green:qss",
+        .gpio        = TL_WA801ND_V2_GPIO_LED_QSS,
+        .active_low    = 1,
+    }, {
+        .name        = "tp-link:green:system",
+        .gpio        = TL_WA801ND_V2_GPIO_LED_SYSTEM,
+        .active_low    = 1,
+    }, {
+        .name        = "tp-link:green:lan",
+        .gpio        = TL_WA801ND_V2_GPIO_LED_LAN,
+        .active_low    = 1,
+    }, {
+        .name        = "tp-link:green:wlan",
+        .gpio        = TL_WA801ND_V2_GPIO_LED_WLAN,
+        .active_low    = 1,
+    },
+};
+
+static struct gpio_keys_button tl_wa801nd_v2_gpio_keys[] __initdata = {
+    {
+        .desc        = "Reset button",
+        .type        = EV_KEY,
+        .code        = KEY_RESTART,
+        .debounce_interval = TL_WA801ND_V2_KEYS_DEBOUNCE_INTERVAL,
+        .gpio        = TL_WA801ND_V2_GPIO_BTN_RESET,
+        .active_low    = 1,
+    }, {
+        .desc        = "RFKILL switch",
+        .type        = EV_SW,
+        .code        = KEY_RFKILL,
+        .debounce_interval = TL_WA801ND_V2_KEYS_DEBOUNCE_INTERVAL,
+        .gpio        = TL_WA801ND_V2_GPIO_SW_RFKILL,
+        .active_low    = 0,
+    }
+};
+
+static void __init tl_wa801nd_v2_setup(void)
+{
+    u8 *mac = (u8 *) KSEG1ADDR(0x1f01fc00);
+    u8 *ee = (u8 *) KSEG1ADDR(0x1fff1000);
+
+    ath79_register_leds_gpio(-1, ARRAY_SIZE(tl_wa801nd_v2_leds_gpio),
+                 tl_wa801nd_v2_leds_gpio);
+
+    ath79_register_gpio_keys_polled(1, TL_WA801ND_V2_KEYS_POLL_INTERVAL,
+                    ARRAY_SIZE(tl_wa801nd_v2_gpio_keys),
+                    tl_wa801nd_v2_gpio_keys);
+
+    ath79_register_m25p80(&tl_wa801nd_v2_flash_data);
+
+    ath79_setup_ar934x_eth_cfg(AR934X_ETH_CFG_SW_PHY_SWAP);
+
+    ath79_register_mdio(1, 0x0);
+
+    ath79_init_mac(ath79_eth0_data.mac_addr, mac, -1);
+    ath79_init_mac(ath79_eth1_data.mac_addr, mac, 0);
+
+    /* GMAC0 is connected to the PHY0 of the internal switch */
+    ath79_switch_data.phy4_mii_en = 1;
+    ath79_switch_data.phy_poll_mask = BIT(0);
+    ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_MII;
+    ath79_eth0_data.phy_mask = BIT(0);
+    ath79_eth0_data.mii_bus_dev = &ath79_mdio1_device.dev;
+    ath79_register_eth(0);
+
+    ath79_register_wmac(ee, mac);
+}
+
+MIPS_MACHINE(ATH79_MACH_TL_WA801ND_V2, "TL-WA801ND-v2", "TP-LINK TL-WA801N/ND v2",
+         tl_wa801nd_v2_setup);
diff --git a/target/linux/ar71xx/generic/profiles/tp-link.mk b/target/linux/ar71xx/generic/profiles/tp-link.mk
index 07d7059..4dd5967 100644
--- a/target/linux/ar71xx/generic/profiles/tp-link.mk
+++ b/target/linux/ar71xx/generic/profiles/tp-link.mk
@@ -93,6 +93,17 @@ endef
 $(eval $(call Profile,TLWA7510))

+define Profile/TLWA801
+    NAME:=TP-LINK TL-WA801N/ND
+    PACKAGES:=
+endef
+
+define Profile/TLWA801/Description
+    Package set optimized for the TP-LINK TL-WA801N/ND.
+endef
+$(eval $(call Profile,TLWA801))
+
+
 define Profile/TLWA901
     NAME:=TP-LINK TL-WA901N/ND
     PACKAGES:=
diff --git a/target/linux/ar71xx/image/Makefile b/target/linux/ar71xx/image/Makefile
index 9ebe486..c2d4a44 100644
--- a/target/linux/ar71xx/image/Makefile
+++ b/target/linux/ar71xx/image/Makefile
@@ -878,6 +878,7 @@ $(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLMR3040,tl-mr3040-v1,TL-MR
 $(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLWR703,tl-wr703n-v1,TL-WR703N,ttyATH0,115200,0x07030101,1,4Mlzma))
 $(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLWR740NV4,tl-wr740n-v4,TL-WR741ND-v4,ttyATH0,115200,0x07400004,1,4Mlzma))
 $(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLWR741NV4,tl-wr741nd-v4,TL-WR741ND-v4,ttyATH0,115200,0x07410004,1,4Mlzma))
+$(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLWA801NV2,tl-wa801nd-v2,TL-WA801ND-v2,ttyS0,115200,0x08010002,1,4Mlzma))
 $(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLWR841NV8,tl-wr841n-v8,TL-WR841N-v8,ttyS0,115200,0x08410008,1,4Mlzma))
 $(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLWR1041,tl-wr1041n-v2,TL-WR1041N-v2,ttyS0,115200,0x10410002,1,4Mlzma))
 $(eval $(call SingleProfile,TPLINK-LZMA,$(fs_64kraw),TLWR2543,tl-wr2543-v1,TL-WR2543N,ttyS0,115200,0x25430001,1,8Mlzma,-v 3.13.99))
diff --git a/target/linux/ar71xx/patches-3.3/660-MIPS-ath79-TL-WA801ND-v2-support.patch b/target/linux/ar71xx/patches-3.3/660-MIPS-ath79-TL-WA801ND-v2-support.patch
index e69de29..37c7771 100644
--- a/target/linux/ar71xx/patches-3.3/660-MIPS-ath79-TL-WA801ND-v2-support.patch
+++ b/target/linux/ar71xx/patches-3.3/660-MIPS-ath79-TL-WA801ND-v2-support.patch
@@ -0,0 +1,38 @@
+--- a/arch/mips/ath79/machtypes.h
++++ b/arch/mips/ath79/machtypes.h
+@@ -77,6 +77,7 @@
+     ATH79_MACH_TL_MR3220,        /* TP-LINK TL-MR3220 */
+     ATH79_MACH_TL_MR3420,        /* TP-LINK TL-MR3420 */
+     ATH79_MACH_TL_WA7510N_V1,    /* TP-LINK TL-WA7510N v1*/
++    ATH79_MACH_TL_WA801ND_V2,    /* TP-LINK TL-WA801ND v2 */
+     ATH79_MACH_TL_WA901ND,        /* TP-LINK TL-WA901ND */
+     ATH79_MACH_TL_WA901ND_V2,    /* TP-LINK TL-WA901ND v2 */
+     ATH79_MACH_TL_WDR4300,        /* TP-LINK TL-WDR4300 */
+--- a/arch/mips/ath79/Kconfig
++++ b/arch/mips/ath79/Kconfig
+@@ -461,6 +461,15 @@
+     select ATH79_DEV_M25P80
+     select ATH79_DEV_USB
+ 
++config ATH79_MACH_TL_WA801ND_V2
++    bool "TP-LINK TL-WA801ND v2 support"
++    select SOC_AR934X
++    select ATH79_DEV_ETH
++    select ATH79_DEV_GPIO_BUTTONS
++    select ATH79_DEV_LEDS_GPIO
++    select ATH79_DEV_M25P80
++    select ATH79_DEV_WMAC
++
+ config ATH79_MACH_TL_WA901ND
+     bool "TP-LINK TL-WA901ND/TL-WA7510N support"
+     select SOC_AR724X
+--- a/arch/mips/ath79/Makefile
++++ b/arch/mips/ath79/Makefile
+@@ -77,6 +77,7 @@
+ obj-$(CONFIG_ATH79_MACH_TL_MR11U)    += mach-tl-mr11u.o
+ obj-$(CONFIG_ATH79_MACH_TL_MR3020)    += mach-tl-mr3020.o
+ obj-$(CONFIG_ATH79_MACH_TL_MR3X20)    += mach-tl-mr3x20.o
++obj-$(CONFIG_ATH79_MACH_TL_WA801ND_V2)    += mach-tl-wa801nd-v2.o
+ obj-$(CONFIG_ATH79_MACH_TL_WA901ND)    += mach-tl-wa901nd.o
+ obj-$(CONFIG_ATH79_MACH_TL_WA901ND_V2)    += mach-tl-wa901nd-v2.o
+ obj-$(CONFIG_ATH79_MACH_TL_WDR4300)     += mach-tl-wdr4300.o
diff --git a/tools/firmware-utils/src/mktplinkfw.c b/tools/firmware-utils/src/mktplinkfw.c
index 2be6335..58a9c39 100644
--- a/tools/firmware-utils/src/mktplinkfw.c
+++ b/tools/firmware-utils/src/mktplinkfw.c
@@ -35,6 +35,7 @@
 #define HWID_TL_MR3420_V1    0x34200001
 #define HWID_TL_WA701N_V1    0x07010001
 #define HWID_TL_WA7510N_V1    0x75100001
+#define HWID_TL_WA801ND_V2    0x08010002
 #define HWID_TL_WA901ND_V1    0x09010001
 #define HWID_TL_WA901ND_V2    0x09010002
 #define HWID_TL_WR703N_V1    0x07030101
@@ -204,6 +205,11 @@ static struct board_info boards[] = {
         .hw_rev        = 1,
         .layout_id    = "4M",
     }, {
+        .id             = "TL-WA801NDv2",
+        .hw_id          = HWID_TL_WA801ND_V2,
+        .hw_rev         = 1,
+        .layout_id    = "4Mlzma",
+    }, {
         .id        = "TL-WA901NDv1",
         .hw_id        = HWID_TL_WA901ND_V1,
         .hw_rev        = 1,

(Note: If you want to compile OpenWRT yourself and create a patch file from the above you have to keep in mind that copy-paste of the above will convert all tabs into spaces. This lets the patch process fail for some files and requires manual corrections in order to succeed. To ease this I uploaded the complete patch here.)

After building the image you can find the result under the ‘bin/ar71xx’ directory which will contain the images for all supported devices using that architecture. In order to install the image onto the device you could simply update the firmware via the web interface. The stock firmware will recognize it as valid and allow installation. But for completeness I would like to explain how it can be installed via the bootloader as well. This could be very helpful especially if you’re experimenting with OpenWRT and something went wrong which bricks your device.

The bootloader is able to receive data via TFTP which in turn requires that you have a TFTP server installed. So either you install that directly on your development machine or any other machine you have at hand. You place the firmware image in the data directory of the TFTP server and start it.

Once you power on the TL-WA801ND you will see a message “Autobooting in 1 seconds” in the console. I.e. you have to be quick to abort autobooting by entering ‘tpl‘ into the console. If you succeed the boot process is interrupted and you will be at the bootloader prompt.

You then need to adjust the boot environment by setting an IP address according to your LAN setup, the IP address of your TFTP server and the name of the image you’re about to install.

U-Boot 1.1.4 (May 24 2012 - 19:13:20)

U-boot AP123

DRAM:  32 MB
id read 0x100000ff
Flash:  4 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag934x_enet_initialize...
wasp reset mask:c03300
WASP ----> S27 PHY
GMAC: cfg1 0x5 cfg2 0x7114
eth0: ba:be:fa:ce:08:41
s27 reg init 
athrs27_phy_setup ATHR_PHY_CONTROL 4: 0x1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 4: 0x10
eth0 up
WASP ----> S27 PHY
GMAC: cfg1 0xf cfg2 0x7214
eth1: ba:be:fa:ce:08:41
s27 reg init lan 
ATHRS27: resetting s27
ATHRS27: s27 reset done
athrs27_phy_setup ATHR_PHY_CONTROL 0: 0x1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 0: 0x10
athrs27_phy_setup ATHR_PHY_CONTROL 1: 0x1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 1: 0x10
athrs27_phy_setup ATHR_PHY_CONTROL 2: 0x1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 2: 0x10
athrs27_phy_setup ATHR_PHY_CONTROL 3: 0x1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 3: 0x10
eth1 up
eth0, eth1
Autobooting in 1 seconds
wasp> 

wasp> setenv serverip 192.168.0.2

wasp> setenv ipaddr 192.168.0.111

wasp> setenv bootfile openwrt-ar71xx-generic-tl-wa801nd-v2-squashfs-factory.bin

In my case the boot environment looked like this afterwards:

wasp> printenv

bootargs=console=ttyS0,115200 root=31:02 rootfstype=squashfs init=/sbin/init mtdparts=ath-nor0:128k(u-boot),1024k(kernel),2816k(rootfs),64k(config),64k(art)
bootcmd=bootm 0x9f020000
bootdelay=1
baudrate=115200
ethaddr=0xba:0xbe:0xfa:0xce:0x08:0x41
dir=
bc=ap123
lu=tftp 0x81000000 ${dir}u-boot.bin&&erase 0x9f000000 +$filesize;cp.b $fileaddr 0x9f000000 $filesize
lf=tftp 0x81000000 ${dir}${bc}-squashfs&&erase 0x9f120000 +$filesize;cp.b $fileaddr 0x9f120000 $filesize
stdin=serial
stdout=serial
stderr=serial
ipaddr=192.168.0.111
serverip=192.168.0.2
bootfile=openwrt-ar71xx-generic-tl-wa801nd-v2-squashfs-factory.bin
ethact=eth1

Environment size: 630/65532 bytes

Issuing the command ‘tftpboot‘ will start the download of the image.

wasp> tftpboot

enet1 port0 up
dup 1 speed 1000
Using eth1 device
TFTP from server 192.168.0.2; our IP address is 192.168.0.111
Filename 'openwrt-ar71xx-generic-tl-wa801nd-v2-squashfs-factory.bin'.
Load address: 0x81000000
Loading: *#################################################################
 #################################################################
 #################################################################
 #################################################################
 #################################################################
 #################################################################
 #################################################################
 #################################################################
 #################################################################
 #################################################################
 #################################################################
 ######################################################
done
Bytes transferred = 3932160 (3c0000 hex)
wasp> erase 0x9f020000 +0x3c0000

First 0x2 last 0x3d sector size 0x10000
   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61
Erased 60 sectors
wasp> cp.b 0x81000000 0x9f020000 0x3c0000

Copy to Flash... write addr: 9f020000
done

If the download was successfully done you will get the amount of transferred bytes (0x3c0000 in the above example) which is then used for the next commands which first erases 0x3c0000 bytes in the flash starting at 0x9f020000 and then copying that amount of data from the RAM starting at 0x81000000 into the flash starting at 0x9f020000. After that was successfully done the bootloader is instructed to start what we flashed by the ‘bootm‘ command:

wasp> bootm 0x9f020000

## Booting image at 9f020000 ...
   Uncompressing Kernel Image ... OK

Starting kernel ...

[    0.000000] Linux version 3.3.8 (openwrt@localhost.home.org) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #1 Fri May 24 10:50:15 CEST 2013
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU revision is: 0001974c (MIPS 74Kc)
[    0.000000] SoC: Atheros AR9341 rev 1
[    0.000000] Clocks: CPU:535.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:25.000MHz
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 02000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Zone PFN ranges:
[    0.000000]   Normal   0x00000000 -> 0x00002000
[    0.000000] Movable zone start PFN for each node
[    0.000000] Early memory PFN ranges
[    0.000000]     0: 0x00000000 -> 0x00002000
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 8128
[    0.000000] Kernel command line:  board=TL-WA801ND-v2 console=ttyS0,115200 rootfstype=squashfs,jffs2 noinitrd
[    0.000000] PID hash table entries: 128 (order: -3, 512 bytes)
[    0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 29136k/32768k available (2092k kernel code, 3632k reserved, 405k data, 212k init, 0k highmem)
[    0.000000] SLUB: Genslabs=9, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:51
[    0.000000] Calibrating delay loop... 266.64 BogoMIPS (lpj=1333248)
[    0.080000] pid_max: default: 32768 minimum: 301
[    0.080000] Mount-cache hash table entries: 512
[    0.090000] NET: Registered protocol family 16
[    0.090000] gpiochip_add: registered GPIOs 0 to 22 on device: ath79
[    0.100000] MIPS: machine is TP-LINK TL-WA801N/ND v2
[    0.510000] bio: create slab  at 0
[    0.520000] Switching to clocksource MIPS
[    0.530000] NET: Registered protocol family 2
[    0.530000] IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.530000] TCP established hash table entries: 1024 (order: 1, 8192 bytes)
[    0.540000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.540000] TCP: Hash tables configured (established 1024 bind 1024)
[    0.550000] TCP reno registered
[    0.550000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.560000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.560000] NET: Registered protocol family 1
[    0.580000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.590000] JFFS2 version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.600000] msgmni has been set to 56
[    0.600000] io scheduler noop registered
[    0.610000] io scheduler deadline registered (default)
[    0.610000] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
[    0.640000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
[    0.650000] console [ttyS0] enabled, bootconsole disabled
[    0.650000] console [ttyS0] enabled, bootconsole disabled
[    0.660000] m25p80 spi0.0: found en25q32b, expected m25p80
[    0.670000] m25p80 spi0.0: en25q32b (4096 Kbytes)
[    0.670000] 5 tp-link partitions found on MTD device spi0.0
[    0.680000] Creating 5 MTD partitions on "spi0.0":
[    0.680000] 0x000000000000-0x000000020000 : "u-boot"
[    0.690000] 0x000000020000-0x0000000ff314 : "kernel"
[    0.700000] mtd: partition "kernel" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[    0.710000] 0x0000000ff314-0x0000003f0000 : "rootfs"
[    0.720000] mtd: partition "rootfs" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[    0.730000] mtd: partition "rootfs" set to be root filesystem
[    0.740000] mtd: partition "rootfs_data" created automatically, ofs=280000, len=170000 
[    0.740000] 0x000000280000-0x0000003f0000 : "rootfs_data"
[    0.750000] 0x0000003f0000-0x000000400000 : "art"
[    0.760000] 0x000000020000-0x0000003f0000 : "firmware"
[    0.780000] ag71xx_mdio: probed
[    0.790000] eth0: Atheros AG71xx at 0xb9000000, irq 4
[    1.340000] ag71xx ag71xx.0: eth0: connected to PHY at ag71xx-mdio.1:00 [uid=004dd042, driver=Generic PHY]
[    1.360000] eth1: Atheros AG71xx at 0xba000000, irq 5
[    1.910000] eth1: Found an AR934X built-in switch
[    2.950000] TCP cubic registered
[    2.950000] NET: Registered protocol family 17
[    2.950000] 8021q: 802.1Q VLAN Support v1.8
[    2.960000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[    2.970000] Freeing unused kernel memory: 212k freed
- preinit -
Press the [f] key and hit [enter] to enter failsafe mode
[    7.420000] eth0: link up (100Mbps/Full duplex)
- regular preinit -
jffs2 not ready yet; using ramdisk
- init -
[    7.930000] eth0: link down
[    8.620000] Compat-drivers backport release: compat-drivers-2013-01-21-1
[    8.620000] Backport based on wireless-testing.git master-2013-02-22
[    8.630000] compat.git: wireless-testing.git
[    8.660000] cfg80211: Calling CRDA to update world regulatory domain
[    8.670000] cfg80211: World regulatory domain updated:
[    8.670000] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[    8.680000] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    8.690000] cfg80211:   (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[    8.700000] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[    8.700000] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    8.710000] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    8.990000] usbcore: registered new interface driver usbfs
[    9.000000] usbcore: registered new interface driver hub
[    9.010000] usbcore: registered new device driver usb
[    9.520000] ieee80211 phy0: Atheros AR9340 Rev:0 mem=0xb8100000, irq=47
[    9.520000] cfg80211: Calling CRDA for country: US
[    9.530000] cfg80211: Regulatory domain changed to country: US
[    9.530000] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[    9.540000] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm)
[    9.550000] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
[    9.560000] cfg80211:   (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    9.570000] cfg80211:   (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    9.570000] cfg80211:   (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    9.580000] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
[    9.640000] PPP generic driver version 2.4.2
[    9.840000] ip_tables: (C) 2000-2006 Netfilter Core Team
[   10.020000] NET: Registered protocol family 24
[   10.030000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[   10.060000] nf_conntrack version 0.5.0 (458 buckets, 1832 max)
[   10.250000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver

Please press Enter to activate this console. [   13.590000] device eth0 entered promiscuous mode
[   15.520000] eth0: link up (100Mbps/Full duplex)
[   15.520000] br-lan: port 1(eth0) entered forwarding state
[   15.530000] br-lan: port 1(eth0) entered forwarding state
[   17.530000] br-lan: port 1(eth0) entered forwarding state
[   23.220000] jffs2_scan_eraseblock(): End of filesystem marker found at 0x0
[   23.240000] jffs2_build_filesystem(): unlocking the mtd device... done.
[   23.240000] jffs2_build_filesystem(): erasing all blocks after the end marker... done.
[   30.100000] JFFS2 notice: (1079) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.

BusyBox v1.19.4 (2013-05-23 16:29:05 CEST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 ATTITUDE ADJUSTMENT (Attitude Adjustment, r36500)
 -----------------------------------------------------
  * 1/4 oz Vodka      Pour all ingredients into mixing
  * 1/4 oz Gin        tin with ice, strain into glass.
  * 1/4 oz Amaretto
  * 1/4 oz Triple sec
  * 1/4 oz Peach schnapps
  * 1/4 oz Sour mix
  * 1 splash Cranberry juice
 -----------------------------------------------------
root@OpenWrt:/#

Here we go! The TL-WA801ND is now running OpenWRT.

[Update: 10.6.2013]

The above patch was missing a file. This is corrected now.

[Update: 5.7.2013]

A compiled binary can be downloaded here.

[Update: 16.7.2013]

A new compiled binary can be downloaded here. It comes with some more preloaded applications:

• luci
• luci-ssl
• luci-app-qos (Quality of Service)
• luci-app-wol (Wake-on-LAN)
• snmpd

[Update: 25.8.2013]

I added a note about the patch above.