RE: [Gumstix-users] Dummy level questions

[Klemmack, J. <JKlemmack@BlueCube.Com>]

A blanket answer is that no data- or address-bus lines are exposed, only
a very small number of lines used by the WaySmall "top board", mostly
basic level communications.  A list of exposed pins is available at
http://www.gumstix.com/interdes.html.=20

1) Can't answer - haven't gotten mine in the mail yet (Gordon??).
However, since Gordon has had them available for less than 1 month, I'm
betting its < 30 days uptime :)

2) The LCD pins of the PXA250 controller are not exposed b/c of the
incredibly small board space.  If you can interface an LCD controller
via the UART or I2C, then you can take that approach, but you'd have to
code from the top down. =20

3) The PXA250 several UARTS, and Gordon has exposed several RX and TX
lines.  To the best of my knowledge they are for RS-232 only, and can
support (according to the PXA250 doc) 230.4kbps.  Someone please correct
me if other "RS" standards are supported.

4) I dunno, but I do know that the PXA250 supports several watchdog
timers.  I'm not sure about specific implementation in Linux. =20

5) Why would you want to add/connect a PCI board to something 1/6th the
size of the PCI board itself?  Again, you can create an interface to a
hardware audio codec though I2C or UART (though I'm not particularly
fond of this option).  I think Zach (?) managed to hook up a speaker to
the UART, but that would be to generate basic buzzes, not reproduce
voice, music, etc.

6) Zach has been using Gnalm, which is a patch on top of the 2.6 kernel.
You can get to his branch from http://gnalm.superlucidity.net/. =20


Unfortunately, a lot of possibilities had to be sacrificed to get the
itty-bitty board design.  Maybe if we begged him enough, Gordon would
create a more full-featured board or daughterboard where we can do more.
For now, though, we have to accept the Gumstix for what they are -
awesome, itty bitty ARM PCs with little input & output capabilities
(barring serial and the upcomming bluetooth).

-----Original Message-----
From: gum...@li...
[mailto:gum...@li...] On Behalf Of Matt
Tharma
Sent: Tuesday, March 16, 2004 1:55 PM
To: gum...@li...
Subject: [Gumstix-users] Dummy level questions


Hey guys, what's up?

I just got to know about this great product last week and I have added
myself to this list. The way you guys are responding to some of the
questions here are amazing! Being just a Linux user and real dummy on
the embedded side, I like to ask you guys some basic question.

1) What is the longest uptime that is recoded on one of these boards?
2) Does it have any LCD/touch screen support off the board or do I need
a custom daughter board?
3) How about RS485 support & what is the limitation in terms of
bandwidth?
4) Any hardware level watchdog support available at this point?
5) Since on board sound is not an option, is it possible to add some
sort of PCI controller and get a PCI sound card added to it?
6) What flavor of Linux are you guys suggest for the gumstix?

Thanks for your time guys and thanks for the wonderful job!


Matt

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