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List:       openocd-development
Subject:    Re: [OpenOCD-devel] ftdi/xds100v2 connection issues
From:       Alex_Züpke <alexander.zuepke () hs-rm ! de>
Date:       2013-11-17 22:09:51
Message-ID: 52893EAF.5000602 () hs-rm ! de
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Hi Andreas,

Am 17.11.2013 20:05, schrieb Andreas Fritiofson:
>
>
>
> On Fri, Nov 15, 2013 at 11:19 AM, Alex Züpke <alexander.zuepke@hs-rm.de
> <mailto:alexander.zuepke@hs-rm.de>> wrote:
>
>     Hi,
>
>     I'm currently testing the FTDI based variant of the xds100v2 driver
>     with a TMS570 target using these scripts: http://openocd.zylin.com/1788
>
>     When using the FTDI-based driver for an initial connnect (target
>     powered down), I cannot connect using the fdti/xds100v2 driver, the
>     scan of the JTAG chain fails:
>
>        Error: JTAG scan chain interrogation failed: all zeroes
>        Error: Check JTAG interface, timings, target power, etc.
>        Error: Trying to use configured scan chain anyway...
>        Error: tms570.jrc: IR capture error; saw 0x00 not 0x01
>        Warn : Bypassing JTAG setup events due to errors
>
>
> I get something similar when using adapters which doesn't have a well
> defined pin state after power-up, such as the JTAGkey-Tiny. But if I'm
> not mistaken, it only happens if I power up the adapter before the
> target board. Or the other way around. I don't really remember. And I
> don't have to use the ft2232 driver to fix it.

It happens regardless of the order I connect power or USB.

>     However, I can connect using the ft2232-based driver. After such an
>     initial connect, the FTDI-based driver also works flawlessly.
>
>     I attached the -d 3 debug output of the three tries:
>     1. FDTI driver fails initially
>     2. ft2232 driver, connects
>     3. FDTI driver connects as well
>
>     Any ideas?
>
>
> Have you tried 1 followed by 3? I mean restarting with the FTDI driver
> after the first failed attempt?
>
> /Andreas

Yes, the state remains "broken" until I have a successful connect using 
the ft2232 driver.



Thanks,
Alex

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