Python3 to lib_hw.so connection problem on ZynqMP (aarch64) , "python3: unhandled alignment fault (7)"

[xilinx]

Python3 to lib_hw.so connection problem on ZynqMP (aarch64) , "python3: unhandled alignment fault (7)"

[giuliogamba]

Official support to Ultrascale+ PYNQ boards (Ultra96/ZCU104) will be added soon.

[feolcn]

Official support to Ultrascale+ PYNQ boards (Ultra96/ZCU104) will be added soon.

Good news,and when it release?

[Pe3ucTop]

Is there any news ?

[giuliogamba]

Just pushed the update to PYNQ 2.3 and support to Ultra96 PYNQ board (with Ultrascale+ Zynq)

[giuliogamba]

Please let me know if this works for you

[feolcn]

hi @giuliogamba when will support ZCU104?

[Pe3ucTop]

@giuliogamba
Sorry for long reply, was out of the office.
Update did not solve problem, still getting "Bus error" with "unhandled alignment fault (7)"

[giuliogamba]

It seems odd, we were able to compile everything on Ultra96 board. Are you sure you pulled the latest version? On which board are you experiencing this?

[Pe3ucTop]

Yes, I tried the latest version too, without success.
Yes, It's odd, because app_hw work without problems, but lib_hw fail , both use same functions.
But I find problem source, it is "memset" which is for (char *)type buffer , in file "qnn/src/library/host/offload-utils.cpp" , it is used in "padTo" function.
It failing when zeroing testBuffer provided in singleInference() under lib_hw . If it is executed on additional buffer, it do not fail.
But final solution I use is in file "qnn/src/library/host/offload-utils.cpp" line 40 :
"OffloadUtils::memset(bufferPadded, 0, outputSize); "
need replace with
"OffloadUtils::memset((ExtMemWord *)bufferPadded, 0, outputSize);"

I testing on 2 different boards: Xilinx ZCU102 and Enclustra Mars XU3 .
And using lib_hw from Python3.6 for quicker prototyping.

[giuliogamba]

You are correct, the problem is in the memset when used on non-cacheable memory with -O3 as optimization strategy.
That's why we changed the optimization strategy here to -O2 and avoid the problem.

[Pe3ucTop]

Thanks for pointing to exact changes relayed to problem. I will recheck once again if I recompile all correctly and give report.

[Pe3ucTop]

Yes, you are right, optimization strategy changes result working lib_hw.
Thanks.