[Bug 1921092] Re: gdbstub debug of multi-cluster machines is undocumented and confusing

[Martin Schönstedt]

qemu-system-arm -cpu cortex-m33 -machine mps2-an521 -nographic -m 16
-vga none -net none -chardev stdio,id=con,mux=on -serial chardev:con
-mon chardev=con,mode=readline -icount shift=7,align=off,sleep=off -rtc
clock=vm -device loader,file=<remote_dir>/zephyr.elf -s -S -kernel
<master_dir>/zephyr.elf

i've included both .elf files in a zip. That should be enough for
running the sample

** Attachment added: "zephyr_sample.zip"
   
https://bugs.launchpad.net/qemu/+bug/1921092/+attachment/5480969/+files/zephyr_sample.zip

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https://bugs.launchpad.net/bugs/1921092

Title:
  gdbstub debug of multi-cluster machines is undocumented and confusing

Status in QEMU:
  Confirmed

Bug description:
  Working with Zephyr RTOS, running a multi core sample on mps2_an521 works 
fine. Both cpus start.
  Trying to debug with options -s -S the second core fails to boot.

  Posted with explanation also at: https://github.com/zephyrproject-
  rtos/zephyr/issues/33635

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