Congratulations!
At 23:09 +0200 20/04/11, Dr. H. Nikolaus Schaller wrote:
Dear all,
after all the previous announcements that were certainly not encouraging
and making everybody happy, I have this time really good news. And hope
that there are only good news to report in the future...
We have finally found a way to patch the power supply issue of our first
engineering sample board and are since this morning able to boot Linux and
demonstrate LXDE on Debian. We will present this unique unit during
LinuxTag on 11-14th May in Berlin. So please come!
This power supply hack was to solder an additional 1.2V LDO chip
(TPS73601DCQ) to give the CPU more supply power [1]. Apparently this
is sufficient to solve the spurious shutdown issue, which was coming from
a very suboptimal PCB layout of our engineering board.
Anyway, the new GTA04A3 boards (which are already in production) have a
heavily improved board layout so that I expect that they will never
show this problem and are much more robust. After knowing how much
the layout can and should be improved, I am still surprised that hacking the
hardware with a 2 ยค LDO chip was a sufficient work-around...
Its possibly because of those "heavy duty" (at
least?) 0,5mm dia copper wires - compared to the
35um ultra-thin and narrow PCB tracks? ;-)
Here is finally a brand new video showing the
device in (battery!) operation: [2]
So we are looking forward to get the new GTA04A3 boards from SMD
assembly (in approx. 4 weeks), connecting a display, inserting a SD card
and a battery ...
Happy easter time to everyone,
Nikolaus Schaller
[1]: http://download.goldelico.com/gta04/images/DSC00784.jpeg
[2]: http://www.youtube.com/watch?v=3KnJc7eImQ4
_______________________________________________
Gta04-owner mailing list
gta04-ow...@goldelico.com
http://lists.goldelico.com/mailman/listinfo/gta04-owner
Happy easter to you too.
Glenn
_______________________________________________
Openmoko community mailing list
community@lists.openmoko.org
http://lists.openmoko.org/mailman/listinfo/community
