On 03/04/2013 10:16:10 AM, Stuart Yoder wrote:
On Mon, Mar 4, 2013 at 2:40 AM, Jia Hongtao <b38...@freescale.com>
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.
If the instruction was a load, we probably at least want to fill the
destination register with 0xffffffff or similar.
And if the core is already hung, due to the PCI link going down, isn't
it too late? How does skipping help?
Maybe the machine check unhangs the core?
Is there an erratum number for this?
-Scott
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