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

[Peter Maydell]

There's now a new docs section on debugging multicore (including multi-
cluster) machines:

https://qemu-project.gitlab.io/qemu/system/gdb.html#debugging-multicore-
machines

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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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