Re: Debian install on NSLU2 restarts when I copy lots of data
NSLU2 Linux wiki has an extensive list of options for 3.3V to RS232 or
USB conversion:
http://www.nslu2-linux.org/wiki/HowTo/AddASerialPort
Also, check out FOX console board using just a couple of transistors and
diods: http://www.acmesystems.it/?id=106
Thanks,
Sergey
> On Mon, Apr 7, 2008 at 11:16 AM, Giles Thomas <giles.thomas@gmail.com>
> wrote:
>
> >
> > On 02/04/2008, Rod Whitby <rod@whitby.id.au> wrote:
> >
> > > Giles, it looks like you're really going to need a serial console to
> > debug this one ...
> >
> > What would I look for with a serial console? I assume that would
give me
> > the console output and persist over a reboot, so perhaps I'm looking for
> > kernel panic messages or the like?
> > If so, I assume (as per <
> > http://www.nslu2-linux.org/wiki/HowTo/AddASerialPort>) that I'll need to
> > start doing a bit of hardware hacking to enable the internal serial
port, is
> > that right?
> >
> >
> Regarding the serial port, I made my own, using a MAX3232 and bunch of
> caps/resistors on the NSLU2 itself (actually by superglueing the MAX3232
> upside down and soldering the components to pins directly), then soldering
> the RS232 signals directly to a cable and hot-glue the whole thing behind
> the ethernet connector. I wouldn't suggest everyone do this. This is the
> datasheet for the MAX3232:
>
> http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1068
>
> What you need is a TTL-to-RS232 converter. I don't know if the
> USB-to-serial adapters will work, as serial EIA232 is specified
negative and
> positive voltages (single-ended not differential), whereby TTL is just
3.3V
> and ground. The MAX3232 has a charge pump to get the negative and
positive
> voltages higher than VCC. Not sure if you can use something that's
> RS(EIA)422 capable.
>
> Googling for "TTL RS232" I saw these links:
>
> http://www.ecrater.com/product.php?pid=1750384
>
http://www.compsys1.com/workbench/On_top_of_the_Bench/Max233_Adapter/max233_adapter.html
>
> Some of the prices for these things is extremely outrageous... $75-$200
> I've seen. Ridiculous. I looked on ebay for "rs232 TTL" and saw several
> candidates. Just make sure the one you get will support 3.3V. The MAX232
> is 5V and MAX3232 is 3.3V (what you need). It shouldn't cost more
than $15,
> and that's being generous.
>
> Next, you'll need some way to interface this to the NSLU2 (see page you
> mention above). If you're good at soldering, I'd recommend some
header test
> pins, 1x4, but I don't know the pin spacing (is it 0.1"? - if so someone
> please update the wiki - I don't have access to my NSLU2 right now to
> measure). Then you'll need to get some kind of female socket, 1x4 jacks,
> soldered to wire to the board you bought.
>
> Let us know what stage you feel comfortable attacking this console
project.
>
> -Rob
>
>
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