Linksys E3000 serial unbrick, Exception 8, endless boot loop

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MaximumXC
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Joined: 15 Feb 2015
Posts: 31

PostPosted: Sat Jul 18, 2015 4:25    Post subject: Linksys E3000 serial unbrick, Exception 8, endless boot loop Reply with quote
Received a bricked E3000, not sure what happened to it, and hooked it up with a serial connection (big thanks to Malachi for pointing me in the right direction on how to do that). The output is below, but basically it returns "Exception 8" and then boot loops endlessly. I can't Ctrl-C to get to the CFE prompt. I even had my wife turn it on for me while I was already hitting the keyboard like crazy, but no go.

I stumbled onto the below post, and it looks like Malachi encountered this, too, with a previous router. Did you ever find a solution to it or was it, as barryware suggested, completely kaput with no hope?

http://ww2.dd-wrt.de/phpBB2/viewtopic.php?t=175564&start=0&sid=6ef6deeae77c03425b820c07221706a8

----------
Output (1 iteration of the loop):

CFE version 1.0.37 for BCM947XX (32bit,SP,LE)
Build Date: Mon Nov 8 16:22:24 CST 2010 (lzh@team2-complier)
Copyright (C) 2000-2008 Broadcom Corporation.

Init Arena
Init Devs.

No DPN
This is a Parallel Flash
Boot partition size = 262144(0x40000)
CPU type 0x19740: 133MHz
Tot mem: 65536 KBytes

CFE mem: 0x80700000 - 0x8079DAC0 (645824)
Data: 0x80732A20 - 0x80737080 (18016)
BSS: 0x80737080 - 0x80737AC0 (2624)
Heap: 0x80737AC0 - 0x8079BAC0 (409600)
Stack: 0x8079BAC0 - 0x8079DAC0 (8192)
Text: 0x80700000 - 0x80732A1C (207388)

Boot version: v4.2
The boot is CFE

mac_init(): Find mac [C0:C1:C0:4F:8B:40] in location 0
Nothing...
country_init(): Find country code in location 0
The country is same
**Exception 8: EPC=80715648, Cause=80008008 (TLBMissRd)
RA=80715650, VAddr=0000000C

0 ($00) = 00000000 AT ($01) = 807300A8
v0 ($02) = 00000000 v1 ($03) = 00000000
a0 ($04) = 80738C80 a1 ($05) = 8072CAB9
a2 ($06) = 00000001 a3 ($07) = 80737AD8
t0 ($0Cool = 8079D654 t1 ($09) = 00000000
t2 ($10) = 807322B0 t3 ($11) = 00000000
t4 ($12) = 00000000 t5 ($13) = 48534C46
t6 ($14) = 9FC036BC t7 ($15) = B9EBFFDE
s0 ($16) = 00000000 s1 ($17) = 00000000
s2 ($1Cool = 8072CA8C s3 ($19) = 8072CA68
s4 ($20) = 8079D880 s5 ($21) = 8079D880
s6 ($22) = 00004716 s7 ($23) = 00000001
t8 ($24) = 04000000 t9 ($25) = 00000000
k0 ($26) = CAD1CAD1 k1 ($27) = CAD1CAD1
gp ($2Cool = 8073AA20 sp ($29) = 8079D858
fp ($30) = 00000000 ra ($31) = 80715650
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MaximumXC
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Joined: 15 Feb 2015
Posts: 31

PostPosted: Sat Jul 18, 2015 4:28    Post subject: Reply with quote
Oh, and I did also try a 30-30-30 as suggested by buddee in this thread:

http://www.dd-wrt.com/phpBB2/viewtopic.php?p=719096
MaximumXC
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Joined: 15 Feb 2015
Posts: 31

PostPosted: Sat Jul 18, 2015 5:01    Post subject: Reply with quote
Just tried pin-shorting it but it's still boot-looping and returning "Exception 8".

http://www.dd-wrt.com/phpBB2/viewtopic.php?t=63371&postdays=0&postorder=asc&start=0
MaximumXC
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Joined: 15 Feb 2015
Posts: 31

PostPosted: Tue Jul 21, 2015 2:54    Post subject: Reply with quote
Bumping in hopes of getting a response.
Murrkf
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Joined: 22 Sep 2008
Posts: 12676

PostPosted: Tue Jul 21, 2015 4:06    Post subject: Reply with quote
Is there jtag support for that router?
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MaximumXC
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Joined: 15 Feb 2015
Posts: 31

PostPosted: Tue Jul 21, 2015 5:17    Post subject: Reply with quote
From what I've read elsewhere, it seems like there's a factory-crippled or disabled JTAG port on the board that would need to have some resistors or other components plugged into it to make it work. Enabling it would be well beyond my capabilities.
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