Re: Problem with JTAG and h5450

Phil Blundell wrote:

>You could try using jflash_pxa_linux (from CVS). I think that's what I
>used last time I needed to debrick an h5400. I have no idea what the
>status is with the openwince bits.
>
>If that fails, I guess you will need to watch the JTAG signals with an
>oscilloscope to make sure that they are all connected properly and doing
>the right thing.
>
>
>
openwince should work, but you need to enable flash_vpp.
jflash_pxa_linux from CVS on handhelds.org will also work.

JTAG TCK is the signal to look at most carefully. If it is ringing,
JTAG will not work. It doesn't help to slow down the clock frequency --
you need to dampen echos and/or reduce the slew rate of the TCK signal.
This is sometimes a major headache.

Jamey
Received on Tue Apr 26 2005 - 08:01:48 EDT