qinwei2004 commented on PR #6478: URL: https://github.com/apache/incubator-nuttx/pull/6478#issuecomment-1185097313
> I would like to say Congratulations on this HUGE PR! > > In the Single Core case, `ostest` is running successfully for me. > > In the SMP case, it seems that `ostest` fails or hangs in different places, but my system is ancient and I am running QEMU 3.1.0 (!!!), so it is possible that I am seeing old bugs in QEMU. I would need to upgrade my system and try the latest QEMU before I could draw any conclusions. > > Anyway, this PR is a very good starting point for NuttX on Arm64 and I look forward to seeing NuttX on real Arm64 hardware! Yes, for SMP，the PR in qemu seem behave very different!! In the beginning, I debug the PR with Ubuntu which is running in VMware. For Single Core, everything is OK, but for SMP, ostest hangs in different places just like your description. After fix some cache sync issue, the crash is occurred at signal testing every time, I check the crash with GDB and see a very strange phenomenon that data is different between CPU register and seeing with GDB, so it seem a data sync issue. I try different cache sync operation at this crash point but not work at all things change when I debug the PR with a real Ubuntu PC, the crash not occurs anymore in that environment. I cannot explain why I see the phenomenon, but I cannot say it's certain a bug in qemu. because maybe with different speed it have different execution order between these two environment. My real Ubuntu environment Ubuntu 18.04.6 LTS QEMU emulator version 4.0.1 (v4.0.1) Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz memory: 16GB I have a IMX8 porting patch but some change need to be done, I will testing it and submit ASAP -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
