Thought I'd report back. I found out why I wasn't able to get console
with the serial
adapter. Long story short, it seems the TX line of my Archer C6 v2 has
something like
500 ohms impedance to ground and to VCC! Very strange.
The RX measures about 10K both to gnd and VCC, like you'd expect.
Adding a 10K pull
up won't get the TX high enough to work, adding a 1k won't either, you
have to go a bit
lower than that. An 820 ohm did the trick. I thought I had a bad
serial adapter, chased
that for a while. Even bought another C7, a v3, thinking the first
was really unrecoverable,
and that one needed a pull up as well, but a 20K was enough pull up to
work fine.
I have no idea why that particular C7 has such low value pullups, on TX
only... But, I now
have got the console, done the manual TFTP, erase, and load, and yea
verily... it frikin' works now.
I didn't learn much about WHY loading the custom FW build caused it to
get stuck, the same FW
has since loaded and run. I did use pins stuck in the holes, no
soldered header on the port
the first time, so possibly there was a break in connection and the FW
load was corrupted.
Wanted to pass this along, for those who might have a similar problem
of not being able
to get into the console with the serial adapter. Measure from the
signal pin to 3.3V and
ground with an ohmmeter, if it's below 1K, you need to grab a lower
value pull up.
Hello all, am having a similar problem with a boot loop. After an
attempted flash of a LEDE build, my router is in a 5-6 second loop.
Am 20.08.2016 um 23:35 schrieb Jochen Demmer:
>//>/> yesterday I bricked an Archer C7 v2 by installing some homebrew />/(buildroot) lede firmware. > It got stuck in a boot loop and it's also />/not reachable on 192.168.1.1 on any time during > boot whatsoever. No />/failsafe mode. Archer C7 v2 can be un-brick with TFTP and U-Boot of />/the router. If you try it with the serial console, you need a program />/which hits 'tpl' for you. > I don't know how to debug this. Could />/someone give me a hint? Is maybe something wrong > within lede for />/Archer C7 ? Did you connect a UART adapter to the router? My Lede />/build for Archer C7 v2 works perfectly. I did never use the />/pre-compiled images and I'm using sysupgrade images only. Regards,
Hartmut / I've progressed thru successful serial terminal configuration, and am
observing the loop, as well as the TFTP firmware loads attemps.
I seem to be failing a check of product ID and version. Then, the
router attempts to boot the firmware with the same failure that I see in
the regular boot loop:
>/#Example of firmware TFTP load, and subsequent problem leading to reboot />//>/dup 1 speed 1000
/>/Using eth1 device />/TFTP from server 192.168.0.66; our IP address is 192.168.0.86 />/Filename
'ArcherC7v2_tp_recovery.bin'. />/Load address: 0x80060000 />/Loading: T
/>/################################################################# />/#######################
/editing out hashtags
>/#################################################################
/>/#################################################################
/>/####################################################### />/done />/Bytes transferred = 16252928 (f80000 hex)
/>/original_product_id = ffffffff />/original_product_ver = ffffffff />/recovery_product_id = c7000002
/>/recovery_product_ver = 01 />/auto update firmware: product id verify fail! />/Autobooting in 1 seconds />/##
Booting image at 9f020000 ... />/Uncompressing Kernel Image ... Stream with EOS marker is not />/supportedLZMA ERROR 1 -
must RESET board to recover />//>/U-Boot 1.1.4 (Oct 14 2015 - 13:34:14) /
The last part starting at the "Autobooting in 1 seconds", is the end of
the boot loop, where it complains, then U-Boot starts again. The
regular loop is much longer, culminating in the image boot and the same
error.
My problem is, I can't seem to catch it with tpl, to stop it and get
to console. Have seen another method of erasing and writing from the
console, but either I need to type faster, or something's wrong with my
console config. Are there any other ways to stop a boot and go to console?
Thanks...
Jon
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