New Life in Openmoko Phones

GNUtoo GNUtoo at
Wed May 20 02:57:58 CEST 2009

On Wed, 2009-05-20 at 02:11 +0200, Rask Ingemann Lambertsen wrote:
> On Tue, May 19, 2009 at 10:52:22AM -0400, Stefan Monnier wrote:
> > That still doesn't explain why removing one of the two accelerometers is
> > a good idea.  What is the benefit?  Why not remove them both?
> > Is it that all the programs that use the accelerometers (as of now) only
> > use one of the two?  Is it that having two accelerometers introduces
> > layout difficulties?  Is it that there aren't enough interrupt lines on
> > the SoC to properly support the two accelerometers? ...
>    I don't think so. We already have both EINT8/GPG0 and EINT16/GPG8
> reserved for the second accelerometer, but not connected it to EINT16/GPG8
> (R1547 = NC). Last time I counted[1], there wasn't a shortage of interrupt
> or GPIO pins.
> [1]
>    If we're really going to mess with the accelerometers, why not move them
> off the SPI1 bus and onto GPIO pins? We're currently using the bitbanging
> GPIO_SPI driver anyway. That way, we could keep a GTA01/GTA02 compatible
> debug connector (because WLAN could use SPI1 instead of SPI0).
> > I actually have the same question for the audio-amp: why remove it?
> > But that one is a bit more complicated, because I'm not sure what is
> > this "audio-amp" anyway (is it the thing that drives the
> > headphone plug?)
>    It drives either the headphone speakers or the bottom handset speaker,
> depending on the presence of the headphone plug. It's the LM4853 (U4101 on
> page 7 of the schematics). IIUC, the GTA03 was going to drive both from the
> WM8753L sound chip directly as suggested in the WM8753L datasheet. I wanted
> to compare the output power of the two, but I can't find the exact LM4853
> variant we're using.
I've some questions:
*will the sound quality be ok(is there a plan to correct the problematic
capacitor that is between the sound card and the audio connector)? and
will it fit into the same case than the GTA02...because if I understood
well the sound problem can't or is too difficult to fix well(otherwise
it's dangerous...) on the GTA02
*Does everything fit into the buses(GPIO,SPI etc...) because the
removing the glamo removes some GPIO if I remember well
*I bet I will need to buy the debug board if I buy such phone...because
I'm afraid of bricking it(no NOR means only one bootloader...and I could
have rendered mine unbootable if the nor was not present: I typed bad
uboot command and that prevented the nand uboot from beeing used(no more
usb-serial access and no more booting))


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