On 07/14/2010 08:01 AM, Alex Hornung wrote: > It seems that the first jtag scan works successfully, but subsequent > scans fail miserably. The 'reset' command works (the device *is* reset) > but it throws an error: > > JTAG scan chain interrogation failed: all ones. > Check JTAG interface, timings, target power, etc. > error: -100 > > I'm a bit late to this discussion, but FWIW, I have never seen this problem using a plain ol' wiggler plugged into a legacy parallel port to debug a pxa270. The only thing I have in my config file for reset_config is...
reset_config trst_and_srst reset_config separate If I'm not mistaken regarding the wiggler hardware, "trst_open_drain" and "srst_open_drain" would also be correct for my case (both resets are pulled up on my board), but again works fine for me when omitted (or even if specified as push_pull). If you're still banging on this, the Intel app note entitled "Recommended JTAG Circuitry for Debug with Intel Xscale Microarchitecure" may help. Fig 3 is a timing diagram showing JTAG signals during reset. Maybe playing with *adapter_nsrst_delay, **jtag_ntrst_assert_width*, etc, vis-a-vis this diagram would help. Also, don't know if you quoted your config files in their entirety, but I don't see where imote2.cfg is sourced. Hope this adds something. -Mike _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
