Haciendo un bucle en el numero de instruccion desde 1 hasta 1F me da las siguientes lineas:
sh-3.1$ wrt54g -probeonly /skipdetect /instrlen:5 /nocwd

====================================
WRT54G/GS EJTAG Debrick Utility v4.8
====================================

Probing bus ... Instruccion: 00000001
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000002
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000003
Done

Instruction Length set to 5

CPU Chip ID: 00000000110000000101001010001000 (00C05288)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000004
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000005
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000006
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000007
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000008
Done

Instruction Length set to 5

CPU Chip ID: 11111111001000000000001000000000 (FF200200)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000009
Done

Instruction Length set to 5

CPU Chip ID: 00001000000000000000000000000100 (08000004)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000000a
Done

Instruction Length set to 5

CPU Chip ID: 00000000000001001000000100001000 (00048108)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000000b
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000000c
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000000d
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000000e
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000000f
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000010
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000011
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000012
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000013
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000014
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000015
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000016
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000017
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000018
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 00000019
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000001a
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000001b
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000001c
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000001d
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

Instruccion: 0000001e
Done

Instruction Length set to 5

CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** CHIP DETECTION OVERRIDDEN ***

- EJTAG IMPCODE ....... : 00000000110000000101001010001000 (00C05288)
- EJTAG Version ....... : 1 or 2.0
- EJTAG DMA Support ... : No

Issuing Processor / Peripheral Reset ... Done
Enabling Memory Writes ... Done
Halting Processor ... <Processor Entered Debug Mode!> ... Done
Clearing Watchdog ... Skipped

Probing Flash at (Flash Window: 0x1fc00000) ... Done

*** Unknown or NO Flash Chip Detected ***

*** REQUESTED OPERATION IS COMPLETE ***

La 3 es ya conocida, y la 8, 9 y A dan otras cosas, por si ayuda.