Re: Re: Getting JTAG working on the iPAQ h2210...

On Thursday 15 April 2004 21:40, Joshua Wise wrote:
> > The trick is very simple: with JTAG, write a program to RAM and run it.
> > That program connects somehow to a port (serial, USB or a custom
> > protocol over JTAG!) and reflashes the NAND.
>
> JTAG cannot write to SDRAM. Remember that JTAG boundary-scan is VERY SLOW
> ... way too slow to refresh the RAM properly! You can try loading to
> instruction cache, but you still need a stub in flash to jump to the
> appropriate area.
>

Hmmm does the SDRAM need the CPU running to refresh? Maybe I'm too much
spoiled with SRAM designs :-)

> > The only point is that I don't have a proper JTAG device. So I'm toying
> > around with a Wiggler device :-(
>
> Ah, Wiggler is fine. It's pretty standard. I'm using an Insight IJC-2 here,
> which is pretty much the same thing, albeit with a different pinout.
>

Also on the h2210? I lack the time to find out what is going wrong and I'm
even having an oscilloscope at my desk...

> > Hopefully, I get that to work soon.
>
> Best of luck
>

Thanks!

Bas.
Received on Thu Apr 15 2004 - 20:57:05 EDT