RE: [Gumstix-users] New Gumstix Stuck at GUM> prompt

[David S. <dav...@nt...>]

OK I=92ve had a multimeter on the cable which is attached to my host=85I =
have
found 2 pins (one with +9ish V and one with -9ish V).  Im not entirely =
sure
which pins I should be checking though as I couldn=92t tell from the =
schematic
on http://www.gumstix.org/tikiwiki/tiki-index.php?page=3DUART_Schematics =
.
I=92m guessing this means the cable is ok=85is there anything I can do =
to try
and test the STUART board?

=20

Dave

=20

  _____ =20

From: gum...@li...
[mailto:gum...@li...] On Behalf Of Craig =
Hughes
Sent: 07 February 2006 20:33
To: Gumstix List
Subject: Re: [Gumstix-users] New Gumstix Stuck at GUM> prompt

=20

Most likely failure is actually in the STUART board I'd guess, or in the
cable.  If you have a voltmeter/oscilloscope you can check the voltage =
level
on the pin in question by connecting it to your host, running Hyperterm =
or
whatnot, and leaving the other end unplugged.  Probe the pins on what =
would
be the gumstix end of the cable, and the gumstix's Rx/host Tx should not =
be
GND, it should have a voltage as long as you're not transmitting from =
the
host.  If you're transmitting, it should be wobbling accordingly.

=20

If the cable is good, let me know, and we'll just mail you a replacement
STUART under RMA.  No need to send the one you have back if it's broken
anyway; it's cheaper and easier to just give you a new one than to get =
the
old back.

=20

C

=20

On Feb 7, 2006, at 12:24 PM, David Scanlan wrote:





Yes this sounds exactly the problem=85but obviously because I=92ve =
=93never=94 had
it running just wanted to check I wasn=92t missing anything.  The cable =
is
null-modem (well it says it is!) and the fact I get some output makes me
think the rest of the serial settings are correct.  Is this likely to be =
a
problem with the cable, STUART board or gumstix itself...I could really =
do
with being able to fix it myself as postage to America is a bit =
expensive
and time consuming as we=92re using it for a university project in =
England.
Thanks for the replys,

=20

Dave

=20

  _____ =20

From: gum...@li...
[mailto:gum...@li...] On Behalf Of Craig =
Hughes
Sent: 07 February 2006 16:57
To: gum...@li...
Subject: Re: [Gumstix-users] New Gumstix Stuck at GUM> prompt

=20

On Feb 7, 2006, at 5:10 AM, J=E9r=F4me Multrier wrote:






hello !
are you shure you're using a nul modem cable, and you turned off hard =
and
soft flux control ?
Try to power gumstix and wait 5~10 seconds befor pluging serial on it ..

2006/2/7,  <mailto:dav...@nt...> dav...@nt... <
<mailto:dav...@nt...> dav...@nt...>:

Hi,

Can someone just clarify something for me. I have just recieved my =
gumstix
and have read it comes preloded with a kernel. I have followed the =
"Getting
Started" instructions and get output on HyperTerminal? up to the point =
where
(in the instructions) it says to login. I don't seem to get to this =
prompt
I'm stuck with the GUM> prompt. Also the bootloader countdown is already =
at
0 remaining which seemed unusual. Am I missing something or is this the
prompt it is referring to? When I type things at this prompt nothing =
seems
to happen-no output and I cant type the help command etc.  I have not =
tried
anything fancy like flashing the image or the bootloader etc I just want =
to
check its working!! Sorry if this is really simple, thanks in advance.=20

=20

The behavior you're describing sounds a lot like the Rx line on the =
gumstix
serial port is being tied to GND, which means the gumstix is =
interpreting
this as a continuous "BRK" signal, which interrupts the countdown.  You =
then
can't type anything, because the short to GND is "eating" your keypress
signals.

=20

C





=20