The BR6104 is based on the ADM5106 SoC (ARM7TDMI) and Broad Net Technology real-time OS (SOHO.BIN).
The BR6104K has one WAN Ethernet port and a 4 port LAN switch. The firmware contains the usual: Linux, Firewall, NAT, dhcp client and server, etc.
BR6104K is actually the same model as BR6104KP, but without USB connector, 48MHz oscillator e.t.c. soldered on the board, and without printer support in the firmware. It is possible to add missed USB parts and have a full BR6104KP model. The instructions are there. Edimax BR6104K/KP is rebranded Sweex LB000021 so PCBs are identical (PCB REV B. uses one DRAM chip, REV A two ones).
The BR6104KP is the same as the BR6104K but has two USB ports that can be used to connect a printer and use it as a print server. Also you can use USB Flash disk for root filesystem (needed patch for usb root device).
BR6104P is based on the ADM5106 ARM7 SoC.
BR6104S is based on the Samsung ARM SoC.
BR6104W is based on the ARM7 SoC.
The BR6104WB is based on the Realtec RTL8181 SoC.
The BR6014WP is based on ARM7 CPU.
Adding a serial port
On the board there is a 8pin connector called JP2 that can be used as serial port. You can connect a serial level shifter (such as the MAX232 familly) to these pins. Its pins are:
1.RX 2.+3.3V 3.nc 4.nc 5.nc 6.nc 7.TX 8.GND
Use the 3.3V as supply for the MAX chip, don't use the 5V from the USB. (You wan't to convert to the processors' levels, not the USBs')
It is possible to use Siemens mobile phone datacable as converter.
Set you terminals' speed to 115200 (8N1). When powering press SPACE three times to get into the boot menu.
ADM5120 Boot: Linux Loader Menu ==================== (a) Download vmlinuz to flash ... (b) Download vmlinuz to sdram (for debug) ... (c) Exit Please enter your key :
Here you can choose to:
- Upload new firmware to Flash (option a), this might be dangerous. Image must be with CSYS header.
- Upload new vmlinuz to RAM (option b), nice for trying your own. Image must be usual vmlinuz.
- Exit (option c), continue to load the vmlinuz already in Flash.
The uploading is done with the XModem protocol.
When experimenting with the ADM5120, you will find that powering off and on is the only way to reboot the switch. This can be annoying. Luckily, adding a reset switch is easy. Locate the 7414 chip (U3 on Edimax). Connecting pen 1 of this chip to GND will reset the board. (Please note: most likely you can reset the board by connecting a whole lot of other pens to GND, some of which will reset the board for good. Be careful.) The 7414 forms the official reset circuit, with a resistor and a condensor (and a diode that I don't understand, BTW).
Edimax recently released the sources to their kernel sources (2.4.18) and other tools such as Busybox.
- http://www.edimax.co.uk/download/Linux-SC.zip (slow as hell)
- http://obm.edimax.com.tw/Edimax-Tools.tgz Toolchains