Re: [Gumstix-users] c++ library size/ serial woes remain

[Sean W. <mod...@ho...>]

Thanks, Ryan.  I actually do have an o-scope here on my desk.  I'll give it 
a try tomorrow.  Perhaps my findings will be illuminating.

-Sean


>From: Ryan Rapetti <rjr...@uc...>
>Reply-To: "General mailing list for gumstix users." 
><gum...@li...>
>To: "General mailing list for gumstix users." 
><gum...@li...>
>Subject: Re: [Gumstix-users] c++ library size/ serial woes remain
>Date: Tue, 25 Jul 2006 16:10:06 -0700
>
>1st point- u-boot and root exist on separate partitions of flash.  I
>don't know how it's allocated but if you're unlucky it won't fit.  As
>for the serial ports, you could write up a little program to
>continuously write 0xFFs to the port, and using the schematics find the
>FFUART TxD pin (on the hirose) and see if it's held at 3.3v (logic 1).
>An o-scope would be nice here, but not required.  If that fails I know
>that there was a discussion a while back (few weeks, maybe less) about
>reflashing the root filesystem over ssh.  It seems to me that the same
>procedure could be done with bluetooth since all that's required is
>console access.  The serial thing is flatly weird, and I can't figure
>what's up except that maybe there's a bad trace somewhere, though that
>would be likely to only affect one data direction.
>
>Ryan
>Sean Wheeler wrote:
>
> >Hey, guys.  It seems that I do in fact have 4MB of flash on my card (it's 
>a
> >basix 400-bt).  When I built buildroot with c++ enabled, my
> >root_fs_arm_nofpu is 3,447,424 bytes and the uboot.bin is only 145,836 
>bytes
> >for a grand total of 3,593,260 leaving just over 400k free.  If I'm not
> >mistaken, by looking in /gumstix-buildroot/build_arm_nofpu/root I should
> >find all the files/folders I am to expect to appear on the gumstix once I
> >load it with uboot, correct?
> >
> >Well, if this is true then this should mean that I'm good on space.  
>Hurray.
> >  My problem is going to be actually loading this image.  I've still not
> >managed to hunt down the serial connection problem I was having a couple 
>of
> >weeks ago despite all the help I received.  Whether using hyperteminal on 
>a
> >windows machine or ckermit on linux, it still acts like I'm not even
> >connected.  The only way I can communicate with the gumstix is over
> >bluetooth, but, as I understand, I need to be able to connect over serial
> >cable to utilize uboot.
> >
> >I was able to determine that the problem does not rest with the host
> >computer or the cable however I was getting inconsistent results when
> >probing the tweener serial port for idle voltages.  Sometimes I'd have a
> >strong voltage... other times I'd have around 0.  I even switched 
>tweeners
> >out, but wasn't getting anything there either.  I wonder now if it's not 
>a
> >problem with the hi-rose connector pins.  At a glance, nothing seems
> >broken/bent out of whack.  Any thoughts?  Thanks.
> >
> >-Sean
> >
> >
> >
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