On Mon, Mar 4, 2013 at 2:40 AM, Jia Hongtao [off-list ref] wrote:

A PCIe erratum of mpc85xx may causes a core hang when a link of PCIe
goes down. when the link goes down, Non-posted transactions issued
via the ATMU requiring completion result in an instruction stall.
At the same time a machine-check exception is generated to the core
to allow further processing by the handler. We implements the handler
which skips the instruction caused the stall.

Can you explain at a high level how just skipping an instruction solves
anything?   If you just skip a load/store and continue like nothing is
wrong, isn't your system possibly in a really bad state.

And if the core is already hung, due to the PCI link going down, isn't
it too late?   How does skipping help?

Stuart