Hello,
I purchased a TUMPA board to debrick my Linksys E3000 router. As this router did not have the JTAG resistors installed, I bridged the lines (TUMPA has current limiting resistors already).
I have confirmed each of the JTAG pins on the E3000 has 3.3V showing and not shorted to each other, etc. There's a short pulse, presumably coming from the micro, when power is turned on.
Running zjtag -probeonly shows:
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zJTAG EJTAG Debrick Utility v1.0
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Set I/O speed to 30000 KHz
USB TAP device has been initialized. Please confirm VREF signal connected!
Press any key to continue... ONCE target board is powered on!
Probing bus ... Done
Detected IR chain Length is 1
CPU Chip ID: 00101011010110110110100000001000 (2B5B6808)
CPU Manufacturer :Unknown(id=808)
CPU Device ID :B5B6
CPU Revision :2
*** Detected a CPU but not in build-in list ***
*** You can set /skipdetect let operate continue ***
The above results seem random and change every time I run it
If I run zjtag -probeonly /L1:4 I get:
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zJTAG EJTAG Debrick Utility v1.0
==============================================
Set I/O speed to 6000 KHz
USB TAP device has been initialized. Please confirm VREF signal connected!
Press any key to continue... ONCE target board is powered on!
Probing bus ... Done
Detected IR chain Length is 0
CPU Chip ID: 00000000000000000000000000000000 (00000000)
*** Unknown or NO CPU Chip ID Detected ***
*** Possible Causes:
1) Router/Modem is not Connected.
2) Router/Modem is not Powered On.
3) Improper JTAG Cable.
4) Unrecognized CPU Chip ID.
With a reduced clock I always get the above results (ie: no CPU detection)
Does zJTAG support the E3000 router? Any switches or options I need to add? Is my only option here to purchase the parallel JTAG board and use TJTAG or something similar? Thanks.