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] http://lists.openmoko.org/pipermail/gta03/2009-April/000074.html > > 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))
Denis. _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community