Fortunately the box comes with serial, although not in very convenient way.
The OpenWRT wiki has photos with locations of the pins.
After some soldering and hot-glueing I had the serial port ready:
To connect it to the PC, I've finally found some use of the Arduino, or rather the FTDI chip that comes with it, as described by ZooBaB:
I've installed a tftp server and copied the firmware to its directory:
root@debian:~# apt-get install tftpd-hpa
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
syslinux-common
The following NEW packages will be installed:
tftpd-hpa
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
Need to get 47.6 kB of archives.
After this operation, 91.1 kB of additional disk space will be used.
Get:1 http://ftp.cz.debian.org/debian/ wheezy/main tftpd-hpa amd64 5.2-4 [47.6 kB]
Fetched 47.6 kB in 0s (196 kB/s)
Preconfiguring packages ...
Selecting previously unselected package tftpd-hpa.
(Reading database ... 108212 files and directories currently installed.)
Unpacking tftpd-hpa (from .../tftpd-hpa_5.2-4_amd64.deb) ...
Processing triggers for man-db ...
Setting up tftpd-hpa (5.2-4) ...
[ ok ] Starting HPA's tftpd: in.tftpd.
root@debian:~# cp /home/hajma/openwrt/openwrt/bin/ar71xx/openwrt-ar71xx-generic-tl-wr741nd-v2-squashfs-sysupgrade.bin /srv/tftp/
root@debian:~#
Then I set the PC's IP to 192.168.1.3 and connected it to the first Ethernet port of the router.
Then I connected to the serial link:
$ screen /dev/ttyUSB1 115200,cs8,-parenb,-cstopb
And this is what I saw:
U-Boot 1.1.4 (Sep 3 2010 - 12:28:13)
AP91 (ar7240) U-boot
DRAM:
sri
#### TAP VALUE 1 = a, 2 = b
32 MB
id read 0x100000ff
flash size 4194304, sector count = 64
Flash: 4 MB
Using default environment
In: serial
Out: serial
Err: serial
Net: ag7240_enet_initialize...
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7014
eth0: 00:03:7f:09:0b:ad
eth0 up
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
eth0 up
No valid address in Flash. Using fixed address
: cfg1 0xf cfg2 0x7214
eth1: 00:03:7f:09:0b:ad
ATHRS26: resetting s26
ATHRS26: s26 reset done
eth1 up
eth0, eth1
Autobooting in 1 seconds
## Booting image at 9f020000 ...
Uncompressing Kernel Image ... Error: Bad gzipped data
GUNZIP ERROR - must RESET board to recover
Resetting...
... stuck in a boot loop due to corrupted firmware.
Following the steps at the OpenWRT wiki to tftp the image:
Type 'tpl' to break to boot loop. Then
ar7240> setenv ipaddr 192.168.1.100
ar7240> setenv serverip 192.168.1.3
ar7240> tftpboot 0x80000000 openwrt-ar71xx-generic-tl-wr741nd-v2-squashfs-sysupgrade.bin
eth1 link down
eth0 link down
Using eth1 device
TFTP from server 192.168.1.3; our IP address is 192.168.1.100
Filename 'openwrt-ar71xx-generic-tl-wr741nd-v2-squashfs-sysupgrade.bin'.
Load address: 0x80000000
Loading: T T T T T T T T T T
Retry count exceeded; starting again
eth0 link down
eth1 link down
Using eth0 device... TFTP from server 192.168.1.3; our IP address is 192.168.1.100
Filename 'openwrt-ar71xx-generic-tl-wr741nd-v2-squashfs-sysupgrade.bin'.
Load address: 0x80000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
##
done
Bytes transferred = 3670020 (380004 hex)ar7240> erase 0x9f020000 +0x380004
First 0x2 last 0x3a sector size 0x10000 58
Erased 57 sectors
ar7240> cp.b 0x80000000 0x9f020000 0x380004
Copy to Flash... write addr: 9f020000
donear7240> bootm 0x9f020000
## Booting image at 9f020000 ...
Uncompressing Kernel Image ... OK
Starting kernel ...
OpenWrt kernel loader for AR7XXX/AR9XXX
Copyright (C) 2011 Gabor Juhos
Looking for OpenWrt image... found at 0xbf022000
Decompressing kernel... done!
Starting kernel at 80060000...
[ 0.000000] Linux version 3.10.28 (hajma@debian) (gcc version 4.6.4 (OpenWrt/Linaro GCC 4.6-2013.05 r39457) ) #4 Fri Feb 14 00:04:39 CET 2014
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU revision is: 00019374 (MIPS 24Kc)
[ 0.000000] SoC: Atheros AR7240 rev 2
[ 0.000000] Clocks: CPU:350.000MHz, DDR:350.000MHz, AHB:175.000MHz, Ref:5.000
MHz
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 02000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x00000000-0x01ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x00000000-0x01ffffff]
[ 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] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 8128
[ 0.000000] Kernel command line: board=TL-WR741ND 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] Writing ErrCtl register=00000000
[ 0.000000] Readback ErrCtl register=00000000
[ 0.000000] Memory: 29168k/32768k available (2062k kernel code, 3600k reserved, 354k data, 268k init, 0k highmem)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:51[ 0.000000] Calibrating delay loop... 232.24 BogoMIPS (lpj=1161216)
[ 0.080000] pid_max: default: 32768 minimum: 301
[ 0.080000] Mount-cache hash table entries: 512
[ 0.090000] NET: Registered protocol family 16
[ 0.100000] MIPS: machine is TP-LINK TL-WR741ND
[ 0.500000] registering PCI controller with io_map_base unset
[ 0.510000] bio: create slab at 0
[ 0.520000] PCI host bridge to bus 0000:00
[ 0.520000] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[ 0.530000] pci_bus 0000:00: root bus resource [io 0x0000]
[ 0.530000] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 0.540000] pci 0000:00:00.0: fixup device configuration
[ 0.540000] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1000ffff 64bit]
[ 0.550000] pci 0000:00:00.0: using irq 40 for pin 1
[ 0.550000] Switching to clocksource MIPS
[ 0.560000] NET: Registered protocol family 2
[ 0.560000] TCP established hash table entries: 512 (order: 0, 4096 bytes)
[ 0.570000] TCP bind hash table entries: 512 (order: -1, 2048 bytes)
[ 0.580000] TCP: Hash tables configured (established 512 bind 512)
[ 0.580000] TCP: reno registered
[ 0.590000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.590000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.600000] NET: Registered protocol family 1
[ 0.620000] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 0.630000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.640000] msgmni has been set to 56
[ 0.650000] io scheduler noop registered
[ 0.650000] io scheduler deadline registered (default)
[ 0.660000] Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
[ 0.680000] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11) is a 16550A
[ 0.690000] console [ttyS0] enabled, bootconsole disabled
[ 0.690000] console [ttyS0] enabled, bootconsole disabled
[ 0.700000] ath79-spi ath79-spi: master is unqueued, this is deprecated
[ 0.710000] m25p80 spi0.0: found s25sl032p, expected m25p80
[ 0.720000] m25p80 spi0.0: s25sl032p (4096 Kbytes)
[ 0.720000] 5 tp-link partitions found on MTD device spi0.0
[ 0.730000] Creating 5 MTD partitions on "spi0.0":
[ 0.730000] 0x000000000000-0x000000020000 : "u-boot"
[ 0.740000] 0x000000020000-0x0000000f8200 : "kernel"
[ 0.750000] mtd: partition "kernel" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[ 0.760000] 0x0000000f8200-0x0000003f0000 : "rootfs"
[ 0.770000] mtd: partition "rootfs" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only
[ 0.780000] mtd: device 2 (rootfs) set to be root filesystem
[ 0.790000] 1 squashfs-split partitions found on MTD device rootfs
[ 0.790000] 0x0000003a0000-0x0000003f0000 : "rootfs_data"
[ 0.800000] 0x0000003f0000-0x000000400000 : "art"
[ 0.810000] 0x000000020000-0x0000003f0000 : "firmware"[ 0.920000] libphy: ag71xx_mdio: probed
[ 1.480000] ag71xx-mdio.0: Found an AR7240/AR9330 built-in switch
[ 2.510000] eth0: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
[ 3.080000] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.0:04 [uid=004dd041, driver=Generic PHY]
[ 3.090000] eth1: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[ 3.090000] TCP: cubic registered
[ 3.100000] NET: Registered protocol family 17
[ 3.100000] 8021q: 802.1Q VLAN Support v1.8
[ 3.120000] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[ 3.130000] Freeing unused kernel memory: 268K (802bd000 - 80300000)
procd: Console is alive
procd: - watchdog -
procd: - preinit -
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 8.090000] eth0: link up (1000Mbps/Full duplex)
kmod: ran 1 iterations
mount_root: jffs2 is not ready - EOF marker found
[ 10.470000] eth0: link down
procd: - early -
procd: - watchdog -
procd: - ubus -
procd: - init -
Please press Enter to activate this console.
Yay!
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