3Com 3CRWDR100A-72
The device is based on Texas Instrument AR7, so you need the target.ar7 in OpenWrt trunk.
OpenWrt status
Untested, probably unsupportable due to limited RAM.
Hardware Highlights
| CPU | Ram | Flash | Network | USB | Serial | JTag |
|---|---|---|---|---|---|---|
| AR7 TNETD7300AGDW | ??MB | 2MiB | 4 x 1 | No | Yes | Yes |
Basic hardware info
The device has the following connectors on the rear (left to right).
- Auxiliary antenna.
- ADSL input connector.
- Power connector (12V 1.2A).
- Reset button.
- Large On/Off button.
- 4 numbered RJ45 10/100 MBit connectors.
- Main antenna.
Hardware
Main processor
The main processor is a Texas Instruments TNETD7300AGDW Processor, an AR7 that should work with the target.ar7 of OpenWrt (yet untested).
Memory
Onboard is a PSC A2V28S40BTP SDRAM Memory chip.
Flash
The flash chip is an Intel TE28F160C3-B 16Mbit (2MiB) 3.0V Flash memory.
Switch chip
The internal switch is a Marvell 88E6060-RCJ 6-port (4 external, 1 to the router itself, 1 unused) 10/100 switch with autosensing.
Wireless card
The wireless chip in mini-pci card is a Texas Instruments TNETW1130GVF, also known as ACX111 chipset.
Photos
Serial
A serial console can be connected to J4.
The serial signals are at a 3.3V level, so you need to use a level convertor, see serial.console
The serial signal itself is 115200 baud, 8 databits, 1 stopbit, no parity (8N1).
The pinout for the serial is
| pin | signal |
|---|---|
| 1 | Not Connected |
| 2 | Not Connected |
| 3 | RX |
| 4 | Not Connected |
| 5 | TX |
| 6 | Not Connected |
| 7 | Not Connected |
| 8 | Not Connected |
| 9 | GND |
| 10 | VCC +3.3V |
Disposition on the board:
| 9 | 7 | 5 | 3 | 1 |
| 10 | 8 | 6 | 4 | 2 |
TODO add output log
JTAG
To enable JTAG functionality, you must short-circuit SHORT pins or put 100R resistor. (At your own risk)
I couldn't write (nor read properly) my flash because I suspect it was broken. But not sure.
But AR7 prom's was read properly.
The AR7 chip has a small memory banks on the chip : 4Kb PROM (@0xBFC00000) and 4Kb RAM (@0x80000000)
The FLASH is located at 0x90000000 (CS0) and RAM is located at 0x94000000 (CS1)
These address extracted from http://www.linux-mips.org/wiki/AR7#Memory+map:http://www.linux-mips.org/wiki/AR7#Memory map
See port.jtag and JTAG tools for more JTAG details.
toh/3com/3crwdr100a-72.txt · Last modified: 2012/03/29 23:16 by orca

