SRST is signal name in OpenOCD.
Schematics show TARGET_RESET(_INTERNAL) connected ok, you can test it by 
logic probe on TP301.

If SAMD firmware is not doing something insane, SWD should connect 
without a reset anyway.
What ASF example do you use? Modified or not? ASF version? Does the 
example  work?

Tomas

On 23.10.2015 4:01, Dario Alcocer wrote:
> Tomas Vanek writes:
>
>      Tomas> Check if SRST is connected to RESETN
>
> I found the schematic for the D20 Xplained board; it's contained within the 
> following design documents archive, available at:
>
>      
> http://www.atmel.com/Images/Atmel-42102-SAMD20-Xplained-Pro_User-Guide.zip
>
> The schematic does not use SRST as a label. The SWD interface refers to 
> TARGET_RESET_SENSE, which is connected to RESET_SENSE_INTERNAL via a level 
> shifter.
>
> I'm not sure this is the information you requested. Please let me know if 
> there's something else I should look for in the schematic.
>
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