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GlobalScale Dreamplug

Posted by rayknight 
GlobalScale Dreamplug
July 23, 2016 08:14AM
Anyone have a clue how to gain serial access to this without purchasing GlobalScale's expensive UART/JTAG module? The pin-out to the UART might be enough.

Ray
Re: GlobalScale Dreamplug
July 23, 2016 10:28AM
The UART port is clearly labeled as such on the manual http://dreamplug.googlecode.com/files/DreamPlug%20User%20Guide_US_v1.1.pdf

and as the wiki says here, http://www.plugcomputer.org/Documentation/all-categories/categorydreamplug/dreamplug/
its pinout is the same as guruplug as the JTAG/UART thingy is the same.

so you can get all info about it from the other page of the same wiki http://www.plugcomputer.org/Documentation/all-categories/categoryguruplug/guruplug/#Serial

As for the pinout, grab a multimeter and figure out what is the power pin (3.3v or 5v) while the box is powered on.

Then you can simply try connecting the other pins until you find the right combination. Serial communication and ground pins don't damage the device (or the TTL dongle you are using) if reversed or placed wrong.

The only pin that can damage your device is the power pin, once that is isolated you can proceed.

In most cases you shouldn't need to connect the ground pin either during testing as the TTL dongle has a ground source already (the usb ground line).

If you cannot find easy sources of 4-pin tiny connectos you can also take 3-pin ones that seem to be more common, as you will need to connect only tx, rx and maybe ground, not 3.3v as the TTL dongle is powered by USB.
Re: GlobalScale Dreamplug
September 26, 2016 07:19AM
bobafetthotmail Wrote:
-------------------------------------------------------
> The UART port is clearly labeled as such on the
> manual
> http://dreamplug.googlecode.com/files/DreamPlug%20
> User%20Guide_US_v1.1.pdf
>
> and as the wiki says here,
> http://www.plugcomputer.org/Documentation/all-cate
> gories/categorydreamplug/dreamplug/
> its pinout is the same as guruplug as the
> JTAG/UART thingy is the same.
>
> so you can get all info about it from the other
> page of the same wiki
> http://www.plugcomputer.org/Documentation/all-cate
> gories/categoryguruplug/guruplug/#Serial
>
> As for the pinout, grab a multimeter and figure
> out what is the power pin (3.3v or 5v) while the
> box is powered on.
>
> Then you can simply try connecting the other pins
> until you find the right combination. Serial
> communication and ground pins don't damage the
> device (or the TTL dongle you are using) if
> reversed or placed wrong.
>
> The only pin that can damage your device is the
> power pin, once that is isolated you can proceed.
>
> In most cases you shouldn't need to connect the
> ground pin either during testing as the TTL dongle
> has a ground source already (the usb ground
> line).
>
> If you cannot find easy sources of 4-pin tiny
> connectos you can also take 3-pin ones that seem
> to be more common, as you will need to connect
> only tx, rx and maybe ground, not 3.3v as the TTL
> dongle is powered by USB.

Looks like the 3 links you've posted are all dead links! has anybody tried those or just me?

-bodhi
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Re: GlobalScale Dreamplug
September 26, 2016 03:56PM
bodhi Wrote:
-------------------------------------------------------
>
> Looks like the 3 links you've posted are all dead
> links! has anybody tried those or just me?

Yep, the whole site is down and stuff was removed from google code too.

But with the powers granted me by the WABAC, I resurrect them here
http://wayback.archive.org/web/20160104002530/https://dreamplug.googlecode.com/files/DreamPlug%20User%20Guide_US_v1.1.pdf

http://wayback.archive.org/web/20160304093637/http://www.plugcomputer.org/Documentation/all-categories/categorydreamplug/dreamplug/

http://wayback.archive.org/web/20160611101911/http://www.plugcomputer.org/Documentation/all-categories/categoryguruplug/guruplug/#Serial

For those wondering: they are coming from the "wayback machine internet archive project" a large non-profit org that backups stuff from around the internet to save it from oblivion, and in the last decade grew to be pretty damn big.
These links shouldn't go dead again. :)



Edited 2 time(s). Last edit at 09/26/2016 04:13PM by bobafetthotmail.
Re: GlobalScale Dreamplug
September 26, 2016 04:34PM
The important part is as follows:

Serial

This is the smaller, 4-pin connector. The layout is:
Pin Line
1 GND
2 RX (pulled up to 3.3V)
3 TX
4 3.3V

What is meant by pulled up to 3.3V for RX? I have tried connecting to pins 1 thru 3 with the same PL2303 based USB Serial adapter I've used with multiple other Marvell based hardware and I get no output. I now have 3 DreamPlugs and a SMILE Plug that use this same connector, so it would be great to figure this out!

Ray
Re: GlobalScale Dreamplug
September 26, 2016 05:13PM
rayknight Wrote:
-------------------------------------------------------
> The important part is as follows:
>
> Serial
>
> This is the smaller, 4-pin connector. The layout
> is:
> Pin Line
> 1 GND
> 2 RX (pulled up to 3.3V)
> 3 TX
> 4 3.3V
>

Orientation? ie. rear facing, top looking down,..

-bodhi
===========================
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Edited 1 time(s). Last edit at 09/26/2016 06:56PM by bodhi.
Re: GlobalScale Dreamplug
September 27, 2016 01:47AM
bobafetthotmail Wrote:
-------------------------------------------------------
> bodhi Wrote:
> --------------------------------------------------
> -----
> >
> > Looks like the 3 links you've posted are all
> dead
> > links! has anybody tried those or just me?
>
> Yep, the whole site is down and stuff was removed
> from google code too.
>
> But with the powers granted me by the WABAC, I
> resurrect them here
> http://wayback.archive.org/web/20160104002530/http
> s://dreamplug.googlecode.com/files/DreamPlug%20Use
> r%20Guide_US_v1.1.pdf
>
> http://wayback.archive.org/web/20160304093637/http
> ://www.plugcomputer.org/Documentation/all-categori
> es/categorydreamplug/dreamplug/
>
> http://wayback.archive.org/web/20160611101911/http
> ://www.plugcomputer.org/Documentation/all-categori
> es/categoryguruplug/guruplug/#Serial
>
> For those wondering: they are coming from the
> "wayback machine internet archive project" a large
> non-profit org that backups stuff from around the
> internet to save it from oblivion, and in the last
> decade grew to be pretty damn big.
> These links shouldn't go dead again. :)

Thanks!

-bodhi
===========================
Wiki
latest Kirkwood kernel builds and rootfs
latest u-boot-kirkwood builds
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Re: GlobalScale Dreamplug
January 05, 2017 04:23PM
I got the Dreamplug and will support this plug.

UART booting works fine with this box. It is a normal serial header, just get the right small JST header and it will work.

Serial consolse pinouts
Small 4-pin connector (I think it is on the left side)
Left-to-Right (outside looking in, the port is exposed as one of the connectors, no modd needed)
1 GND 	
2 RX

3 TX
4 3.3V

-bodhi
===========================
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latest Oxnas kernel builds and rootfs
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Edited 3 time(s). Last edit at 03/10/2017 02:27AM by bodhi.
Raz
Re: GlobalScale Dreamplug
January 16, 2017 04:19PM
bodhi,

I just got a Dream Plug, and I downloaded and decompressed your jessie rootfs on its micro SD card, and it booted
fine and all, but when I did an apt-get upgrade it made the rootfs unmountable, thus failed to boot afterwards
Any reason why? or how to recover from it?
Re: GlobalScale Dreamplug
January 16, 2017 07:04PM
Raz
Re: GlobalScale Dreamplug
January 18, 2017 11:46AM
Thanks for the reply. But no, /boot isn't and the first partition which holds the uImage is left untouched.
And my uboot doesn't load initrd.
I am very puzzled by this. Apt-get update on wheezy rootfs works fine though, but on the jessie rootfs makes
the rootfs unmountable.

Has anybody else tried it? (on dreamplug, I mean)
Re: GlobalScale Dreamplug
January 18, 2017 03:59PM
Raz

> Thanks for the reply. But no, /boot isn't and the
> first partition which holds the uImage is left
> untouched.

Now this is a hint where the problem might be. Do you have serial console? if you do post the log.

If you don't have serial console post the this log with the rootfs that working:
dmesg
mount
fw_printenv

It's easier to see the problem when you post more information!.

-bodhi
===========================
Wiki
latest Kirkwood kernel builds and rootfs
latest u-boot-kirkwood builds
latest Oxnas kernel builds and rootfs
latest u-boot-oxnas builds
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