This is an old revision of the document!

TP-LINK TL-WR741ND

Wireless router with detachable antenna, upgradable with OpenWrt. Follow the instructions on the OpenWrt wiki. My model is V.4.x , purchased in Italy.

CPU	Atheros AR9330
RAM	32 Mb
Flash	4 Mb

This is the recipe to install OpenWrt, I used trunk (BARRIER BREAKER, Bleeding Edge, r39638):

Factory reset the router
Download the *-factory.bin firmware image.
Use the original web-based procedure to upgrade the firmware, upload the above image.
Connect with telenet 192.168.1.1 and set the root password.
Connect with ssh root@192.168.1.1

# cat /proc/cpuinfo
system type             : Atheros AR9330 rev 1
machine                 : TP-LINK TL-WR741ND v4
processor               : 0
cpu model               : MIPS 24Kc V7.4
BogoMIPS                : 265.42
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 16
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 4, address/irw mask: [0x0000, 0x0900, 0x0120, 0x0088]
isa                     : mips1 mips2 mips32r1 mips32r2
ASEs implemented        : mips16
shadow register sets    : 1
kscratch registers      : 0
core                    : 0
VCED exceptions         : not available
VCEI exceptions         : not available

# free
             total         used         free       shared      buffers
Mem:         28908        27632         1276            0         1716
-/+ buffers:              25916         2992
Swap:            0            0            0

# cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00020000 00010000 "u-boot"
mtd1: 00104e2c 00010000 "kernel"
mtd2: 002cb1d4 00010000 "rootfs"
mtd3: 00100000 00010000 "rootfs_data"
mtd4: 00010000 00010000 "art"
mtd5: 003d0000 00010000 "firmware"

We installed the following extra packages:

coreutils, coreutils-base64
etherwake, wol
kmod-tun, libbz2, liblzo, libpolarssl, openvpn-polarssl, zlib
libpcap, tcpdump-mini

This is the free space after installing them:

# df -h
Filesystem                Size      Used Available Use% Mounted on
rootfs                    1.0M    940.0K     84.0K  92% /
/dev/root                 1.8M      1.8M         0 100% /rom
tmpfs                    14.1M     64.0K     14.1M   0% /tmp
/dev/mtdblock3            1.0M    940.0K     84.0K  92% /overlay
overlayfs:/overlay        1.0M    940.0K     84.0K  92% /
tmpfs                   512.0K         0    512.0K   0% /dev

Some interesting lines from dmesg:

Memory: 28644k/32768k available (2325k kernel code, 4124k reserved, 607k data, 264k init, 0k highmem)

ar933x-uart: ttyATH0 at MMIO 0x18020000 (irq = 11) is a AR933X UART
console [ttyATH0] enabled, bootconsole disabled

m25p80 spi0.0: en25q32b (4096 Kbytes)
5 tp-link partitions found on MTD device spi0.0

ag71xx-mdio.1: Found an AR7240/AR9330 built-in switch
eth0: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04 [uid=004dd041, driver=Generic PHY]
eth1: Atheros AG71xx at 0xb9000000, irq 4, mode:MII