From: Ash Charles <ash@gu...> - 2011-02-05 19:59:27
Gumstix publishes this Signals document (
http://www.gumstix.net/images//gumstix_overo_signals_v1.4.pdf ) which
explains the signals on all the lines brought out from the Overo COM
modules as well as the high-level internals of the COMs. Judging by
the numerous expansion board designs based on the COM, I estimate that
this document supplies the details required to design an Overo COM
based expansion board. If this doesn't provide some information that
you feel is imperative, let us know so we can improve this document.
Gumstix is not willing to publish full schematics for the COM modules
however we do endeavour to be as open as possible and it is of course
in our best interest that you have the information you need to make a
successful Gumstix-based product.
For your specific questions:
> how to adapt/design a proper driver for the BT and the WIFI module of the
> OVERO FIRE Board?
The BT and Wifi module is a W2CBW003 module which contains a Marvell
chip-set (including the 88W8686 chip IIRC). The firmware on the
device is closed-source from Marvell however there is a substantial
effort within the Linux kernel community to improve the Libertas
driver which interacts with this module. Others on this list and on
the libertas mailing list would know far more than me about the
details and current challenges.
> How is adapted the microphone in line?
There are two audio input lines broken out from the Overo COMs, a
mic-in (as per the reference design for analog psuedo-differential
mode in the TPS65950 manual) and a standard line-in.
> How is handle the microphone bias signal ?
The mic-bias signal is handled by the alsa driver in the kernel.
Please see the note here:
> Are the reference design of TI chip followed exactly, if not what are the
> significant differences
I'm not actually privy to the design of the Overo COM. That said, I
suspect that the reference designs from TI were followed pretty
Get latest updates about Open Source Projects, Conferences and News.