Hi,
Today I have been attempting to get the JTAG port on my H10 working in an effort to figure out more about the PP5020.
I've successfully built a cable based on the instructions here:
http://openwince.sourceforge.net/jtag/iPAQ-3600/ and used it to hook my H10 up to the parallel port on my computer. I
connected to the TCK, TDO, TDI, TMS, TRST, VDD33 and DGND points on the
H10 (centre-left of this image: http://www.rockbox.org/twiki/pub/Main/IriverH10Info/pcb_back.jpg).
It looks like the cable works at least. I used the jtag tools (http://openwince.sourceforge.net/jtag/) software and it was able to detect my H10. That's about all I was able
to do though, since the software doesn't have any support for the PP5020.
I was able to get some output from the detect and discovery commands (http://barrywardell.net/assets/files/h10-jtag.txt), but that's all so far.
It detects two parts, both with the same device Id. Could these be the two ARM cores in the PP5020 chip? Does anyone know of any other software that may be useful for working with JTAG and ARM? Or how i could adapt the jtag tools to work with the PP5020?
If I can get this working, I think it could be a very useful tool for generally debugging PortalPlayer hardware.
Barry
