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The Mercury MAC1200R (TPLINK WR6300) is one of the cheapest AC based routers on the planet, as I have a few AC devices I thought I’d buy one to try out. They’re available for under RMB120 or so online.

Mercury hardware is TPLink hardware, albeit using a different name. Same stuff, same factory, different casing.

The router has 64M ram, and 8M flash. CPU / Wifi AR9344 / QCA9882

OpenWRT says it has support, so I had a quick go at taking a look at flashing one.

First steps:

Open up the unit (remove the 2 screws underneath, then use a spare credit card or similar to jam open the plastic case).

The serial headers are to the right of the SoC.
You’ll need a rs232 to ttl or usb to ttl adaptor.

pl2303

gnd, tx, rx

Pin 1 is GND
Pin 2 is TX (connect to rx)
Pin 3 is RX (connect to tx)
Pin 4 is VCC (don’t connect).

Port speeds are 115200,8,n,1

Connect up, and you should see a flurry of activity on boot.

To get into the bootloader (uBoot), you’ll need to type tpl
May take a few tries, so prepare to pull power and retry again, and again till you get in.

uboot

You’ll need a TFTPD server running on 192.168.1.100 to push files over. My Mac no haz ethernet (and Thunderbolt to Ethernet is crud), so I use my venerable X40 and tftpd software.

Firmware is up here. (Or you can compile your own) -> http://pan.baidu.com/s/1hqkVOfa

Firmware locations in flash (see below)
printenv
bootargs=console=ttyS0,115200 root=31:02 rootfstype=jffs2 init=/sbin/init mtdparts=ath-nor0:256k(u-boot),64k(u-boot-env),6336k(rootfs),1408k(uImage),64k(mib0),64k(ART)
bootcmd=bootm 0x9f020000
bootdelay=1
baudrate=115200
ethaddr=0xba:0xbe:0xfa:0xce:0x08:0x41
ipaddr=192.168.1.111
serverip=192.168.1.100
dir=
lu=tftp 0x80060000 ${dir}u-boot.bin&&erase 0x9f000000 +$filesize&&cp.b $fileaddr 0x9f000000 $filesize
lf=tftp 0x80060000 ${dir}db12x${bc}-jffs2&&erase 0x9f050000 +0x630000&&cp.b $fileaddr 0x9f050000 $filesize
lk=tftp 0x80060000 ${dir}vmlinux${bc}.lzma.uImage&&erase 0x9f680000 +$filesize&&cp.b $fileaddr 0x9f680000 $filesize
stdin=serial
stdout=serial
stderr=serial
ethact=eth0

Environment size: 686/65532 bytes

Upload to the uBoot

U-Boot 1.1.4--LSDK-10.1.389 (Apr 9 2014 - 15:23:02)

U-Boot DB120
Wasp 1.2

DRAM: 64 MB
Flash Manuf Id 0xef, DeviceId0 0x40, DeviceId1 0x17
flash size 8MB, sector count = 128
Flash: 8 MB
Using default environment

In: serial
Out: serial
Err: serial
Net: ag934x_enet_initialize...
No valid address in Flash. Using fixed address
No valid address in Flash. Using fixed address
wasp reset mask:c02200
WASP ----> S27 PHY
s27 reg init
: cfg1 0x80000000 cfg2 0x7114
eth0: ba:be:fa:ce:08:41
athrs27_phy_setup ATHR_PHY_CONTROL 4 :1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 4 :10
eth0 up
WASP ----> S27 PHY
s27 reg init lan
ATHRS27: resetting s27
ATHRS27: s27 reset done
: cfg1 0x800c0000 cfg2 0x7214
eth1: ba:be:fa:ce:08:41
athrs27_phy_setup ATHR_PHY_CONTROL 0 :1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 0 :10
athrs27_phy_setup ATHR_PHY_CONTROL 1 :1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 1 :10
athrs27_phy_setup ATHR_PHY_CONTROL 2 :1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 2 :10
athrs27_phy_setup ATHR_PHY_CONTROL 3 :1000
athrs27_phy_setup ATHR_PHY_SPEC_STAUS 3 :10
eth1 up
eth0, eth1
Setting 0xb8116290 to 0x30602d0f
Autobooting in 1 seconds
db12x>

db12x> tftpboot 0x81000000 image.bin
eth1 link down
enet0 port4 up
dup 1 speed 100
Using eth0 device
TFTP from server 192.168.1.100; our IP address is 192.168.1.111
Filename 'image.bin'.
Load address: 0x81000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
##############################
done
Bytes transferred = 3145732 (300004 hex)
db12x> erase 0x9f020000 +0x3c0000
Erasing flash... ............................................................
Erased 60 sectors
db12x> cp.b 0x81000000 0x9f020000 0x3c0000
Copy to Flash... ............................................................done
db12x> bootm 9f020000

It should boot into OpenWRT, you can flash from there.


...[long kernel bootlogs redacted]

- init complete -

BusyBox v1.22.1 (2014-12-15 18:46:26 CST) 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
-----------------------------------------------------
BARRIER BREAKER (14.07, r42625)
-----------------------------------------------------
* 1/2 oz Galliano Pour all ingredients into
* 4 oz cold Coffee an irish coffee mug filled
* 1 1/2 oz Dark Rum with crushed ice. Stir.
* 2 tsp. Creme de Cacao
-----------------------------------------------------

cat /proc/mtd
dev: size erasesize name
mtd0: 00020000 00010000 "u-boot"
mtd1: 0010206c 00010000 "kernel"
mtd2: 006cdf94 00010000 "rootfs"
mtd3: 004d0000 00010000 "rootfs_data"
mtd4: 00010000 00010000 "art"
mtd5: 007d0000 00010000 "firmware"

I highly recommend replacing the bootloader with an unlocked one.
i.e. this one – https://github.com/pepe2k/u-boot_mod

Bootloader sits at 0x9f000000 and is 64kb in size.
Suggest load in ram at 0x80060000 like they do, and flash from there.

eg from the bootloader –

tfpboot 0x80060000 uboot.bin
erase 0x9f000000 +0x20000
cp.b 0x80060000 0x9f000000 0x20000

Pray that it didn’t mess up (or you need an spi flasher…), and reboot!

Other bits n bobs –

You’ll need to adjust the opkg.conf file

ssh into the router @ 192.168.1.1 / root / root

mv /etc/opkg.conf /etc/opkg.conf.orig

echo 'dest root /
dest ram /tmp
lists_dir ext /var/opkg-lists
option overlay_root /overlay
src/gz barrier_breaker_base http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/base
src/gz barrier_breaker_management http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/management
src/gz barrier_breaker_oldpackages http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/oldpackages
src/gz barrier_breaker_packages http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/packages
src/gz barrier_breaker_routing http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/routing
src/gz barrier_breaker_telephony http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/telephony
src/gz barrier_breaker_luci http://downloads.openwrt.org/barrier_breaker/14.07/ar71xx/generic/packages/luci

#src/gz barrier_breaker_base http://downloads.openwrt.org/snapshots/trunk/ar71xx/packages/base
#src/gz barrier_breaker_management http://downloads.openwrt.org/snapshots/trunk/ar71xx/packages/management
#src/gz barrier_breaker_oldpackages http://downloads.openwrt.org/snapshots/trunk/ar71xx/packages/oldpackages
#src/gz barrier_breaker_packages http://downloads.openwrt.org/snapshots/trunk/ar71xx/packages/packages
#src/gz barrier_breaker_routing http://downloads.openwrt.org/snapshots/trunk/ar71xx/packages/routing
#src/gz barrier_breaker_telephony http://downloads.openwrt.org/snapshots/trunk/ar71xx/packages/telephony' >> /etc/opkg.conf

…and install Luci (the openwrt webui)

opkg update
opkg install luci

You should be able to visit http://192.168.1.1 and start changing settings.

Screen Shot 2014-12-30 at 12.32.24 AM

Screen Shot 2014-12-30 at 12.32.34 AM

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