[OPAE] hello_fpga hangs forever for xeon with integrated fpga

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Hello,

accidentally, I got a skylake-sp with integrated fpga.

After some investigations, I find I could not drive it for anything. I am a
little surprising and not sure if your guys can give some lights?

1. default shipped stuff does not work although basic cmds works:

under centos 7.4:
---------- fpgainfo fme ----------
Board Management Controller, microcontroller FW version unavailable
Last Power Down Cause: unavailable
Last Reset Cause: unavailable (can't open)
//****** FME ******//
Object Id                     : 0xEF00000
PCIe s:b:d:f                  : 0000:7E:00:0
Device Id                     : 0xBCC0
Socket Id                     : 0x00
Ports Num                     : 01
Bitstream Id                  : 0x6400002FC614BB9
Bitstream Version             : 0x558900000406
Pr Interface Id               : 1a422218-6dba-448e-b302-425cbcde1406

---------- fpgainfo bmc ----------
Board Management Controller, microcontroller FW version unavailable
Last Power Down Cause: unavailable
Last Reset Cause: unavailable (can't open)
//****** BMC SENSORS ******//
Object Id                     : 0xEF00000
PCIe s:b:d:f                  : 0000:7E:00:0
Device Id                     : 0xBCC0
Socket Id                     : 0x00
Ports Num                     : 01
Bitstream Id                  : 0x6400002FC614BB9
Bitstream Version             : 0x560000000406
Pr Interface Id               : 1a422218-6dba-448e-b302-425cbcde1406

---------- fpgainfo port ----------
//****** PORT ******//
Object Id                     : 0xEC00000
PCIe s:b:d:f                  : 0000:7E:00:0
Device Id                     : 0xBCC0
Socket Id                     : 0x00
Ports Num                     : 01
Bitstream Id                  : 0x6400002FC614BB9
Bitstream Version             : 6.4.0
Pr Interface Id               : 1a422218-6dba-448e-b302-425cbcde1406
Accelerator Id                : d8424dc4-a4a3-c413-f89e-433683f9040b
Accelerator GUID              : d8424dc4-a4a3-c413-f89e-433683f9040b

hello_fpga hangs forever:
...
run on bus 0x7e
(hangs forever here)

And nlb0 output like this:
[2860][ERROR][nlb0] test timeout at 1 cachelines.


under kernel 4.20.x with upstreaming DFL driver:
the output is same like below (except that the Socket Id is show as 0xFF,
in fact there seems no "Socket Id" exposed under DFL driver).


now my question is: how to further debug for this case?(assumed the cpu
should work)


2. the downloadable acceleration-stack[1] is just for PAC, not
for intg_xeon.
So I can not use this tool to re-generate/re-config a new gbs in that the
bbs for intg_xeon does not exist. And so the naming of "Intel=C2=AE Acceler=
ation
Stack for Intel Xeon=C2=AE CPU with FPGAs" is a little deceptive. Or (hopef=
ully)
am I wrong about this tool?



best regards,
Jin Mingjian

[1]
https://www.intel.com/content/www/us/en/programmable/solutions/acceleration=
-hub/acceleration-stack.html

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