Hi, I'm trying to set up DCI OOB with Intel System Studio 2020 (target CPU i9-9900K, host CPU i5-1035G1, both running Linux). I can establish a DCI connection both via System Studio and via ipccli (green light from the CCA, the CPU microarchitecture and stepping is recognised correctly, and I can enumerate a range of devices with ipccli), but in both cases I get an error that there are "no available CPU threads" when I try to use System Trace or the System Debugger. When I try to run an ipccli command affecting the CPU cores like ipc.halt() I get the error message "There are no GPC cores available to halt". Does anyone have any ideas what could be causing this - is there perhaps another BIOS setting I need to change, or is it more likely to be an OpenIPC configuration problem? I'm using the default 9th Gen Intel Core Processor (Coffee Lake S Refresh) / Cannon Lake PCH-H configuration.
These are the changes I've made so far to enable DCI: on the target, IA32_DEBUG_INTERFACE reports it's enabled, and HDCIEN is also set. I've set PCH Trace Hub Enable Mode to Host/Target Debugger respectively on the two systems, and both have Platform Debug Consent set to 0x1 (DCI OOB+[DbC]). I've also enabled CPU Run Control and Intel Enhanced Debug on the target, and disabled CPU Run Control Lock. I haven't set the CPU Trace Hub Enable Mode for the i9-9900K, as it wasn't present in the UEFI Setup variables.
