Re: [jornada] Re: Jornada Flashboard

whygee:

Great! I'm still trying to finish up my other projects (having problems with early-userspace on a 2.6 kernel :( ). Once I do that, I'll have time to finalize the flashboard design and then we'll be talking....

Regards,
-Mark Gollahon

whygee wrote ..
> Mark Gollahon <golly <at> stellarwerx.com> writes:
> > All:
>
> Hi there !
>
> i'm a new J680 + J720 owner and want to *play* with it :-)
> so i'm googling around...
>
>
> > Thank you for all of your thoughts for my new addition! This is actually
> our
> second - our first is now four
> > years old.
> >
> > Anyway, to answer some of your questions: Yes, I am pretty sure that
> I can
> "squeeze" 64Megs of RAM onto the
> > flashboards. All I need to do is to read the part numbers off of the
> chips on
> my fried daughtercard as the J728
> > has 64Megs RAM. Actually, I am going to try and get as much RAM and
> flash on
> it as I can, barring any problems
> > with the Jornada's memory map (i.e. what is RAM and what is flash, etc.).
> Also, I want to put at least 32Megs
> > of flash on it, but I need to review the memory map and be sure I'm not
> clobbering anything.
> >
> > The hardest part of the whole process is figuring out how to program
> the flash
> for the first time. There are
> > two possiblities:
> >
> > 1. program the flash, then solder it to the board, or
> > 2. solder it to the board, then program the flash.
> >
> > Programming the flash first makes logistics a little easier as I can
> simply
> find the nearest standard flash
> > programmer and have at it. However, if I (or anyone else for that matter)
> bricks a board, the board is pretty
> > much dead unless the flash chips are removed and reprogrammed - and removing
> SMT chips is *not* fun.
> >
> > Programming the flash after the chips are on the board means that I need
> to
> design and build a special
> > programmer, but makes the whole process easier and bricking a board is
> "no big
> deal". This is the option I am
> > currently exploring. I am fairly certain I can use a USB interface to
> a PIC
> microcontroller and let the PIC
> > handle the programming. However, I don't have any PIC experience, but
> I do
> know someone who does.
>
> 'I' have a PIC experience :-P
>
> look at the guy with the red pullover, that's me :
> http://whygee.club.fr/drosephylia/index.html
> and i have done all the electronics there.
>
> oh, and now i know how to solder 0.5mm pitch components :-)
>
> > Anyway, that is where I am currently. Any and all ideas are welcome.
> >
> > Regards,
> > -Mark Gollahon
>
>
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Received on Tue Jul 05 2005 - 22:11:23 EDT