User Tools

Site Tools

This wiki is read only and for archival purposes only. >>>>>>>>>> Please use the new OpenWrt wiki at <<<<<<<<<<

3Com 3CRWER100-75

ASAP I' ll try to improve this article. Now here is step by step installation of OpenWrt for experienced user. NOT for beginners.

Supported Versions

Version/Model Launch Date S/N OpenWrt Version Supported Model Specific Notes
- - - trunk r28395 -

Hardware Highlights

CPU Ram Flash Network USB Serial JTag
Atheros 2315A@180MHz 16MiB 4MiB 1 + 4 No Yes ?

Downloading files


Other SW


You are doing everything at your own risk! Nobody is responsible for what you are doing. Don't do it if you don't know what you are doing! Incomplete BETA version of text!

Operating system

  • Set your IP: (alt.
  • Mask:


  • Start server listening on: (alt.


  • Telnet to (alt. on port 9000 to get Redboot prompt
  • It's better to use .bat (Because port open only 1 second)
  • You can use some usefull script from

putty.exe -telnet -P 9000
goto redboot 


  • Verify config ( last point where you can stop the procedure )

fconfig -l

  • Clear flash

fis init

  • Agree with format


  • Download kernel from TFTP server

load -r -b %{FREEMEMLO} openwrt-atheros-vmlinux.lzma

  • Create partition for kernel

fis create -r 0x80041000 -e 0x80041000 vmlinux.bin.l7

  • Download RootFS from TFTP server

load -r -b %{FREEMEMLO} openwrt-atheros-root.squashfs

  • Check free space

fis free

  • Create partition for RootFS. Replace 0x2E0000 for number you get as difference between last number of free space and the first number. All in hex.

fis create -l 0x2E0000 rootfs

  • Verify partition table

fis list

  • Reboot into OpenWrt



Verify OpenWrt installation

  • Telnet to on standard port(23)
  • If it does not work try:

1) Telnet to (alt. on port 9000 to get Redboot prompt

RedBoot> fis load -l vmlinux.bin.l7
RedBoot> go 0x80041000 

2) Now you can see Open Wrt promt.


3) Thus you have to correct booting procedure. Reboot device

Telnet to
RedBoot> fconfig -l 
RedBoot> fconfig boot_script_data

Enter following:

fis load -l vmlinux.bin.l7
go 0x80041000

Save and reboot.

Serial on JP1


  • brown = gnd
  • red, orange = tx and rx (sry, I don't know which is which and now I can't test it)

Switch Ports


Port Switch port Router's port label Interface
LAN Port 0 LAN 4 eth0.1
LAN Port 1 LAN 3 eth0.1
LAN Port 2 LAN 2 eth0.1
LAN Port 3 LAN 1 eth0.1
WAN Port 4 Cable/DSL eth0.2
CPU Port 5 N.A. eth0

To find out the dev switch name:

root@OpenWrt:~# swconfig list
Found: switch0 - eth0

To check the switch ports list:

root@OpenWrt:~# swconfig dev switch0 show
Global attributes:
        enable_vlan: 1
        name: IP175C
        phy: 0
        reg: 0
        val: 12544
Port 0:
        status: up, 10 Mbps, full duplex, auto-negotiate
        link: 10
        tagged: 0
        pvid: 1
Port 1:
        status: down, auto-negotiate (in progress)
        link: 0
        tagged: 0
        pvid: 1
Port 2:
        status: down, auto-negotiate (in progress)
        link: 0
        tagged: 0
        pvid: 1
Port 3:
        status: down, auto-negotiate (in progress)
        link: 0
        tagged: 0
        pvid: 1
Port 4:
        status: up, 100 Mbps, full duplex, auto-negotiate
        link: 100
        tagged: 0
        pvid: 2
Port 5:
        status: up, 100 Mbps, cpu port
        link: 100
        tagged: 1
        pvid: 0
        vid: 1
        ports: 0 1 2 3 5t 
        vid: 2
        ports: 4 5t 


toh/3com/3crwer100_75.txt · Last modified: 2016/08/12 16:05 by andreajvc