Linksys WRT300n v1

802.11n "draft" MIMO router with 100 Mbit/s switches.

Supported Versions

The wireless does not work with OpenWRT "out of the box."

Version/Model Launch Date S/N OpenWrt Version Supported Model Specific Notes
v1 2006-07 CNP01 WIP -

Later versions (1.1, 2.0) are significantly different hardware, so for the purposes of OpenWRT consider v1 a distinct model.

Hardware Highlights

CPU Ram Flash Network USB Serial JTag
Broadcom 4704@300MHz 32MiB 4MiB 4 + 1 No Yes Yes/3.02

Installation

Flash Layout

Please check out the article Flash Layout. It contains an example and a couple of explanations.

OEM easy installation

This section deals with how you install OpenWrt from a device freshly opened. Plus the steps required such as reset to factory defaults if the device has already been configured

Note: Reset router to factory defaults if it has been previously configured.

  • Update with OpenWRT .bin file
  • Wait for it to reboot
  • Telnet to 192.168.1.1 and set a root password

OEM installation using the TFTP method

This only seems to work when the firmware is corrupt (or the bootloader thinks it is). Bootloader has a TFTP server on 192.168.1.1

Hint: when ping shows a ttl=100, the bootloader is running, while ttl=64 means the firmware is running.

Upgrading OpenWrt

generic.sysupgrade

If you have already installed OpenWrt and like to reflash for e.g. upgrading to a new OpenWrt version you can upgrade using the mtd command line tool. It is important that you put the firmware image into the ramdisk (/tmp) before you start flashing.

Terminal Upgrade Process

  • Login as root via SSH on 192.168.1.1 (or whatever you configured it to).
  • Use the following commands to upgrade:

cd /tmp/
wget http://downloads.openwrt.org/snapshots/trunk/brcm47xx/openwrt-brcm47xx-squashfs.trx
sysupgrade /tmp/openwrt-brcm47xx-squashfs.trx

Basic configuration

Basic configuration After flashing, proceed with this.

Specific Configuration

Interfaces

The default network configuration is:

Interface Name Description Default configuration
br-lan LAN & WiFi 192.168.1.1/24
vlan0 (eth0.0) LAN ports (1 to 4) None
vlan1 (eth0.1) WAN port DHCP
wl0 WiFi Does Not Work Yet

To get wireless working, see: https://forum.openwrt.org/viewtopic.php?pid=153351 Namely, install kmod-brcm-wl-mimo

Switch Ports (for VLANs)

Numbers 0-3 are Ports 1-4 as labeled on the unit, number 4 is the Internet (WAN) on the unit, 5 is the internal connection to the router itself. Don't be fooled: Port 1 on the unit is number 3 when configuring VLANs. vlan0 = eth0.0, vlan1 = eth0.1 and so on.

Port Switch port
Internet (WAN) 4
LAN 1 3
LAN 2 2
LAN 3 1
LAN 4 0

Failsafe mode

Buttons

hardware.button on howto use and configure the hardware button(s).

The Linksys WRT300n has two buttons. Here, we merely name the buttons, so we can use them in the above Howto:

BUTTON Location Event
Reset back reset
Reserved top ses

Hardware

Info

Architecture: MIPS
Vendor: Broadcom
Bootloader: CFE v4
System-On-Chip: Broadcom 4704
CPU/Speed Broadcom BMIPS3300 V0.6 @300MHz
Flash-Chip: Intel JS28FR320 C3BD70 A5437913
Flash size: 4 MiB
RAM: 32 MiB
RAM-Chip: hynix 602U HY5DU281622ETP-J
Wireless: Broadcom BCM4321 2.4ghz 802.11bgn
Ethernet: Broadcom 4704
Ethernet Switch: Broadcom BCM5325
USB: No (maybe with some hw mods, BCM4704 supports it)
Serial: Yes
JTAG: Yes

Photos

FCC Exhibits List

Model Number

Front:

FIXME Extract from FCC Exhibits

Back:

FIXME Extract from FCC Exhibits

Opening the case

Note: This will void your warranty!

  • To remove the cover do a/b/c

Each blue cover is held in place by 2 bracket-like clips in the front (LEDs side) and 2 round brackets in the rear (network ports side). To remove the top cover (the one with the button going through it), pull the back of the blue cover away from the router and towards the front (in such a manner that the front clips act as pivot). The round clips should release relatively easily. Then, gently shake the cover left and right until the angle bracket release from their sockets. To remove the bottom blue cover, you first need to pull the rubber feet towards you (there is a spring mechanism that will allow them to be pulled) enough so that you can rotate them 180 degrees. Once the feets are out of the way, proceed in the same manner as for the top cover.

Once the blue covers are out, you will need to unscrew 4 T10 secure Torx screws located in the corners under the bottom blue cover. After that, you will need to remove the black front part. In order to do so, you will need to squeeze all 4 pairs of arrow-like clips attaching it to the main (grey) cover. Using longnose pliers, gently squeeze one pair together and tilt the black part slightly such that the clips won't clip back again. Repeat for all 4 pairs of clips.

Main PCB

FIXME Extract from FCC Exhibits

Serial

According to simucas

  • Connector (JP2) is located behind the WAN (blue) port.
  • Pinout left to right): GND flow? RXD TXD VCC (assuming that the flow? is the flow-control pin from the router).
  • Needs a level-shifter (MAX232 or equiv) to connect to a standard serial port.
  • Settings: 115200 8-n-1

general information about the serial port, serial port cable, etc.

JTAG

port.jtag general information about the JTAG port, JTAG cable, etc.

How to connect to the JTAG Port of this specific device:

Photo of PCB with markings

Debricking

Bootloader Mods

  1. you could read about bootloader in general

Hardware mods

  1. as a beginner, you really should inform yourself about soldering in general and then obtain some practical experience!

Notes

According to 10045 to get wireless working "you need to install the proprietary broadcom driver instead, b43 does not support this hardware."

8861 seems to apply here too.

Tags

For some Help with the Tags, please have a look here: tags

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toh/linksys/wrt300n1.txt · Last modified: 2014/10/09 14:38 by theoradicus