read probe broken on mvme2700 (at least)

[mdavidsaver]

At least with the mvme2700 BSP read probe always returns success, even when the underlying VME operation ends with a bus error (verified with VME bus analyzer). It does work with the mvme6100 and 3100.

[till-s]

bspExt relies on VME bus errors being propagated from the VME bridge to the host (PCI) bridge. Some boards have even a MCP exception wired up. If this is not the case then bspExt polls the host bridge after the probe.
I'd recommend to first check that you can see a bus error flagged in the universe chip and then troubleshoot the propagation to the pci bridge and interrupt controller.