This one seems to have JTAG and serial port so worth exploring.
I couldn't find direct support for WRT54G2 v1.5
Soldering iron is warming up...
After holding the reset button during power up for about 10sec and then releasing, I'm seeing this VxWorks banner
auto-booting...
boot device : tffs:
unit number : 0
processor number : 0
host name : host
file name : /fl/vxWorks.bin
inet on ethernet (e) : 192.168.1.1:ffffff00
host inet (h) : 192.168.1.100
user (u) : target
flags (f) : 0x8
target name (tn) : targetname
Attaching to TFFS... done.
Loading /fl/vxWorks.bin...1171568
Starting at 0x80501a24...
usrNetDevNameGet: no network device
Attaching interface lo0... done
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]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]] Development System
]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]] VxWorks version 5.5
]]]]]]]]]]]]]]]]]]]]]]]]]] KERNEL: WIND version 2.6
]]]]]]]]]]]]]]]]]]]]]]]]] Copyright Wind River Systems, Inc., 1984-2002
/fl/ - Volume is OK
-> LLTD: wireless interface argument is ath0.
ath0: IEEE 802.11 Fetching hardware channel/rate support not supported.
Serial port is at 115200
Serial pins:
GND
NC
Rx
Tx
VCC ?
-> help
help Print this list
ioHelp Print I/O utilities help info
dbgHelp Print debugger help info
nfsHelp Print nfs help info
netHelp Print network help info
spyHelp Print task histogrammer help info
timexHelp Print execution timer help info
h [n] Print (or set) shell history
i [task] Summary of tasks' TCBs
ti task Complete info on TCB for task
sp adr,args... Spawn a task, pri=100, opt=0x19, stk=20000
taskSpawn name,pri,opt,stk,adr,args... Spawn a task
td task Delete a task
ts task Suspend a task
tr task Resume a task
d [adr[,nunits[,width]]] Display memory
m adr[,width] Modify memory
mRegs [reg[,task]] Modify a task's registers interactively
pc [task] Return task's program counter
-> version
VxWorks (for WRT54G2) version 5.5.
Kernel: WIND version 2.6.
Made on Feb 21 2012, 17:22:35.
Boot line:
tffs:(0,0) host:/fl/vxWorks.bin h=192.168.1.100 e=192.168.1.1:ffffff00 u=target tn=targetname f=0x8
value = 111 = 0x6f = 'o'