Sitecom WLR-2100 V2

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This device is not supported in the official OpenWrt builds. Experimental builds are available (see below).

CPU Ram Flash Network USB Serial JTAG
Atheros AR1321 32MiB 4MiB 4 x 1 No* Yes* No*

* Possible with modifications.

Architecture MIPS 74Kc
Vendor Sitecom
bootloader U-Boot
System-On-Chip Atheros AR1321 (Atheros AR1321-AL1A PCK898.00B 1138)
CPU/Speed 500 MHz
Flash 4 MiB (cFeon Q32B-104HIP AJM291A4 1244LMA)
RAM 32 MiB (Hynix 236A H5DU2562GTR-E3C NWJM0330AHE)
Wireless Atheros AR1321 (integrated)
Ethernet Atheros AR1321 (integrated)
USB No (available with modification)
Serial Yes (available with modification)
JTAG No (available with modification)

According to WikiDevi, the Atheros AR1321 seems identical to the AR9341.

Note: This will void your warranty!

  • Remove the four screws at the bottom of the device in each corner
  • Remove the fifth screw located under the sticker
Description Position Color GPIO PCB Name Mode
Power 1 Amber GPIO15 LED8 Active low
WiFi 2 (top) Blue GPIO13 LED1 Active low
WPS 2 (bottom) White GPIO12 LED9 Active low
WAN 3 Blue GPIO18 LED7 Active low
LAN1 (4*) 4 Blue GPIO19 LED3 Active low
LAN2 (3*) 5 Blue GPIO20 LED4 Active low
LAN3 (2*) 6 Blue GPIO21 LED5 Active low
LAN4 (1*) 7 Blue GPIO22 LED6 Active low

* LAN port numbers are reversed in OpenWrt.

The position is numbered from left to right when front facing the router.

Description GPIO PCB Name Mode
OPS (WPS) GPIO16 SW3 Active low
Seconds Mode
2 OPS mode
10 Reset
15 Factory default

Serial console is available on the J4 connector. No pin header is available, so you might want to solder a pin header on the PCB. Remove the solder from the holes, preferable with desoldering techniques such as litze wire. If not possible, use a 0.8 mm drill.

Do not connect Vcc. Only connect GND, TxD and TxR.

Serial communication might not be reliable. Oddly, it works well in boot command line mode. This needs more investigation.

Setting Value
Baudrate 115200
Data Bits 8
Stop Bits 1
Parity None
Handshake None
Pin Description Notes
1 Vcc 3.3V, NC, marked with arrow
3 TxD
4 RxD

According to the datasheet, the AR9341 supports USB 2.0 and JTAG. The USB data pins do not have soldering pads on the PCB. However, the pins are directly accessible on the chip, so an USB mod can be easily made with some soldering skills. The supplied experimental images are compiled with USB kernel modules. JTAG is available on the GPIO ports, but this is not tested yet.

Description Photo
PCB top view Photo externally hosted on OneDrive
Serial front view External photo hosted on OneDrive
Serial back view Photo externally hosted on OneDrive

Officially, only one version of the firmware is available for the WLR-2100 V2. However, some routers may be shipped with another older version of the firmware. The bootlog is based on the official firmware provided by Sitecom.

U-Boot 1.0.1 (Mar 14 2012 - 16:09:18)                                           
U-boot AP123                                                                    
Wasp 1.1                                                                        
wasp_ddr_initial_config(280): Wasp (16bit) ddr1 init                            
Tap value selected = 0xf [0x0 - 0x1f]                                           
32 MB                                                                           
Top of RAM usable for U-Boot at: 82000000                                       
Reserving 235k for U-Boot at: 81fc4000                                          
Reserving 192k for malloc() at: 81f94000                                        
Reserving 44 Bytes for Board Info at: 81f93fd4                                  
Reserving 36 Bytes for Global Data at: 81f93fb0                                 
Reserving 128k for boot params() at: 81f73fb0                                   
Stack Pointer at: 81f73f98                                                      
Now running in RAM - U-Boot at: 81fc4000                                        
id read 0x1c15                                                                  
Unknown flash device                                                            
Flash:  4 MB                                                                    
*** Warning *** : PCIe WLAN Module not found !!!                                
In:    serial                                                                   
Out:   serial                                                                   
Err:   serial                                                                   
Please choose the operation:                                                    
   1: Load system code to SDRAM via TFTP.                                       
   3: Boot system code via Flash (default).                                     
   4: Entr boot command line interface.                                         
3: System Boot system code via Flash.                                           
## Booting image at 9f040000 ...                                                
   Image Name:   Linux Kernel Image                                             
   Created:      2013-07-01   6:10:50 UTC                                       
   Image Type:   MIPS Linux Kernel Image (lzma compressed)                      
   Data Size:    1355370 Bytes =  1.3 MB                                        
   Load Address: 80002000                                                       
   Entry Point:  80006110                                                       
   Verifying Checksum at 0x9f040040 ...OK                                       
   Uncompressing Kernel Image ... OK                                            
No initrd                                                                       
## Transferring control to Linux (at address 80006110) ...                      
## Giving linux memsize in bytes, 33554432                                      
Starting kernel ...                                                             
Booting Atheros AR934x                                                          
init started: BusyBox v1.7.5 (2013-07-01 14:07:05 CST)                          
starting pid 672, tty '/dev/console': '/sbin/config_init'                       
mknod: /dev/ttyS0: File exists                                                  
mknod: /dev/ttyS1: File exists                                                  
Config Init version: date: 2013/07/01                                   
Tue Jan  1 00:00:00 UTC 2013                                                    
mount: can't find /sys in /etc/fstab or /etc/mtab                               
ln: /lib/./modules: File exists                                                 
starting pid 724, tty '/dev/ttyS0': '/sbin/config_term'                         
*                            WLR-2100_3100                             *        
KernelApp/Ramdisk Ver:                    Date:2013/07/01                

The password lin17 can be used to login into the shell.

The bootargs report a different MTD layout compared to what is actually loaded by the kernel. Seems to be some left over code due to source recycling (NVRAM on Atheros)?

bootargs=console=ttyS0,115200 root=31:02 rootfstype=squashfs,jffs2 init=/sbin/init mtdparts=ar7240-nor0:256k(u-boot),64k(u-boot-env),2752k(rootfs),896k(uImage),64k(NVRAM),64k(ART)
# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00400000 00010000 "ALL"
mtd1: 00030000 00010000 "Bootloader"
mtd2: 00010000 00010000 "Config"
mtd3: 00340000 00010000 "Kernel"
mtd4: 001f0000 00010000 "apps"
mtd5: 00010000 00010000 "manufacture"
mtd6: 00010000 00010000 "backup"
mtd7: 00050000 00010000 "storage"
mtd8: 00010000 00010000 "caldata"
# cat /proc/partitions
major minor  #blocks  name

  31        0       4096 mtdblock0
  31        1        192 mtdblock1
  31        2         64 mtdblock2
  31        3       3328 mtdblock3
  31        4       1984 mtdblock4
  31        5         64 mtdblock5
  31        6         64 mtdblock6
  31        7        320 mtdblock7
  31        8         64 mtdblock8
# cat /proc/mounts
rootfs / rootfs rw 0 0
/proc /proc proc rw,relatime 0 0
/dev/mtdblock7 /storage jffs2 rw,relatime 0 0
/dev/mtdblock4 /apps squashfs ro,relatime 0 0
Layer 0 Layer 1 Layer 2
ALL mtd0 4096 Bootloader mtd1 192
Config mtd2 64
Kernel mtd3 3328 vmlinux 1344
app mtd4 1984
manufacture mtd5 64
backup mtd6 64
storage mtd7 320
caldata mtd8 64

This in an experimantal build of OpenWrt. Use this firmware at own risk.

Version Date Type Notes Download
0.1 07-12-2016 Initramfs Build with default packages + USB + LUCI Firmware externally hosted on OneDrive
0.1 07-12-2016 Patch Not a quilt patch file Patch file externally hosted on OneDrive
Version 0.1
- First experimental build for OpenWrt on WLR-2100 V2.
- Based on OpenWrt trunk (9d64efa1a23f31847f4a9bef9f3474a9cf3fadb3).
- The white OPS led serves as status led.
- OPS button needs configuration, does not work out of the box.
- Not intended for flashing.

This section describes actions that might damage your device or firmware. Proceed with care!

Currently, loading the firmware via TFTP is the only possible way of running OpenWrt on the WLR-2100 V2. Permanent flashing will be available soon. Grab the Precompiled binaries, or apply the patch and build your own firmware with the OpenWrt Buildroot.

This part can be skipped if you want to use the precompiled binaries. Prior knowledge is required to build your own firmware. Please check out the documentation for more information on installing and using the OpenWrt Buildroot.

  1. Install the OpenWrt Buildroot.
  2. Apply the patch file to your OpenWrt buildroot (this modifies your OpenWrt source code, quilt patches will be available soon).
  3. Configure your buildroot. A target profile for the WLR-2100 V2 should be available after applying the patch. For now, create a ramdisk to run OpenWrt on the WLR-2100 V2. Flashable images will be available soon.
  4. Build your OpenWrt firmware.

Currently, no flashable images are available. However, you are able to load the OpenWrt firmware via serial and TFTP.

  1. Create a TFTP server to serve the firmware file as 'ap.bin'.
  2. Assign the static IP address to the server and make sure the server is accessible for the router.
  3. Connect the WLR-2100 V2 via serial, and load up a console to see the output.
  4. During boot, keep tapping '1' to load system code to the SDRAM via TFTP.
  5. OpenWrt should now boot!

For now, please report bugs on the forum thread. Maybe some day the device profile will be added to the OpenWrt master branch.

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  • Last modified: 2021/10/15 09:06
  • by bobafetthotmail