Hi,
I get the error message as below for a bare metal debug
### prints from the command window
interrupt
ERROR(TAD9-NAL52):
! Unable to stop device Cortex-A9
! Cannot attain state requested.
More information: http://ds.arm.com/msgcode/ds5/ME-TAD9-NAL52
### DS - 5 version info
ARM DS-5 Professional Edition
Version: 5.20.0
Build number: 5200024
Full product installation (linux, x86)
Java HotSpot(TM) Server VM, version: 1.7.0_60
Did you follow the "more information" link to see if that helps? The error is described in more detail:
ERROR(TAD9-NAL52): Why is DS-5 unable to control my target when debugging the Linux kernel via JTAG?
Feel free to add to that thread if it doesn't fully answer your question.
Thanks,
Joe