The DSL-2500U is made by Dlink, and is an ADSL modem with an ethernet port.

Model Number

Front:

Photo of front of the casing

Back:

Photo of back of the casing

Note: This will void your warranty!

• To remove the cover simply pull off the two rubber feet, then undo the screws beneath them. Run a fingernail along the crack between the two pieces, and the case will pop off easily.
• There is one screw holding the PCB to the bottom cover.

Main PCB

Photo of PCB

The serial port is marked as J2 and looks like:

xoxxx where x is a pin, and o is a vacant position with no pin.

Currently, the known pins are:

RoxGT

where G = ground, T = the device's Tx pin (connected to your terminal's Rx pin, obviously), R = the device's Rx pin.

Auto-negotiation timed-out
10 MB Half-Duplex (assumed)
CPU type 0x29010: 240MHz
Total memory: 8388608 bytes (8MB)

Total memory used by CFE:  0x80401000 - 0x80527930 (1206576)
Initialized Data:          0x8041D020 - 0x8041F160 (8512)
BSS Area:                  0x8041F160 - 0x80425930 (26576)
Local Heap:                0x80425930 - 0x80525930 (1048576)
Stack Area:                0x80525930 - 0x80527930 (8192)
Text (code) segment:       0x80401000 - 0x8041D014 (114708)
Boot area (physical):      0x00528000 - 0x00568000
Relocation Factor:         I:00000000 - D:00000000

Board IP address                  : 192.168.1.1:ffffff00
Host IP address                   : 192.168.1.100
Gateway IP address                :
Run from flash/host (f/h)         : f
Default host run file name        : vmlinux
Default host flash file name      : bcm963xx_fs_kernel
Boot delay (0-9 seconds)          : 1
Board Id (0-12)                   : 96332
Number of MAC Addresses (1-32)    : 12
Base MAC Address                  : 00:24:01:06:dd:cd
PSI Size (1-64) KBytes            : 24

*** Press any key to stop auto run (1 seconds) ***
Auto run second count down: 0
Code Address: 0x80010000, Entry Address: 0x80181018
Decompression OK!
Entry at 0x80181018
Closing network.
 Starting program at 0x80181018
Linux version 2.6.8.1 (jenny@BS5) (gcc version 3.4.2) #1 Wed Mar 4 2 1:10:17 CST 2009
Serial flash device: name S25FL016A, id 0x0114, size 2048KB
96332 prom init
CPU revision is: 00029010
Determined physical RAM map:
 memory: 007a0000 @ 00000000 (usable)
On node 0 totalpages: 1952
 DMA zone: 1952 pages, LIFO batch:1
 Normal zone: 0 pages, LIFO batch:1
 HighMem zone: 0 pages, LIFO batch:1
Built 1 zonelists
Kernel command line: root=31:0 ro noinitrd console=ttyS0,115200
brcm mips: enabling icache and dcache...
Primary instruction cache 16kB, physically tagged, 2-way, linesize 16 bytes.
Primary data cache 8kB 2-way, linesize 16 bytes.
PID hash table entries: 32 (order 5: 256 bytes)
Using 120.000 MHz high precision timer.
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory: 6024k/7808k available (1287k kernel code, 1764k reserved,  184k data, 64k init, 0k highmem)
Calibrating delay loop... 239.20 BogoMIPS
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Checking for 'wait' instruction...  unavailable.
NET: Registered protocol family 16
Total Flash size: 2048K with 32 sectors
File system address: 0xbfc10100
Can't analyze prologue code at 80150754
PPP generic driver version 2.4.2
NET: Registered protocol family 24
Using noop io scheduler
bcm963xx_mtd driver v1.0
brcmboard: brcm_board_init entry

======= GPIO CONFIG_BCM96338 inited ========
Serial: BCM63XX driver $Revision: 3.00 $
ttyS0 at MMIO 0xfffe0300 (irq = 10) is a BCM63XX
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 512 bind 1024)
NET: Registered protocol family 1
NET: Registered protocol family 17
Ebtables v2.0 registered
NET: Registered protocol family 8
NET: Registered protocol family 20
802.1Q VLAN Support v1.8 Ben Greear <greearb@candelatech.com>
All bugs added by David S. Miller <davem@redhat.com>
VFS: Mounted root (squashfs filesystem) readonly.
Freeing unused kernel memory: 64k freed
init started:  BusyBox v1.00 (2009.03.04-13:11+0000) multi-call  binary
Algorithmics/MIPS FPU Emulator v1.5


BusyBox v1.00 (2009.03.04-13:11+0000) Built-in shell (msh)
Enter 'help' for a list of built-in commands.


Loading drivers and kernel modules...

atmapi: module license 'Proprietary' taints kernel.
adsl: adsl_init entry
blaadd: blaa_detect entry
Broadcom BCMPROCFS v1.0 initialized
Broadcom BCM6338A2 Ethernet Network Device v0.3 Mar  4 2009 21:09:19
Config Internal PHY Through MDIO
BCM63xx_ENET: Auto-negotiation timed-out
BCM63xx_ENET: 10 MB Half-Duplex (assumed)
eth0: MAC Address: 00:24:01:06:DD:CD
BcmAdsl_Initialize=0xC0068A08, g_pFnNotifyCallback=0xC00816D4
AnnexCParam=0x7FFF7EB8 AnnexAParam=0x00000980 adsl2=0x00000000
pSdramPHY=0xA07FFFF8, 0x64905 0xDFADBFFF
AdslCoreHwReset: AdslOemDataAddr = 0xA07EF96C
AnnexCParam=0x7FFF7EB8 AnnexAParam=0x00000980 adsl2=0x00000000
dgasp: kerSysRegisterDyingGaspHandler: dsl0 registered
ATM proc init !!!

==>   Bcm963xx Software Version: RU_1.50   <==

device eth0 entered promiscuous mode
br0: port 1(eth0) entering learning state
br0: topology change detected, propagating
br0: port 1(eth0) entering forwarding state

##############status LED blink now##################
br0: port 1(eth0) entering disabled state  

The original GPL sourcecode v1.00 can be downloaded Here Here Here. It consist on a Linux 2.? kernel with binary Broadcom tools&drivers and sourcecode of the kernel and the rest of tools.

• CategoryModel 100MB Network with 1 port