checkstop processing

Oliver oohall at
Tue Nov 14 16:15:59 AEDT 2017

On Tue, Nov 14, 2017 at 2:42 PM, Joel Stanley <joel at> wrote:
> On Tue, Nov 14, 2017 at 8:04 AM, Sergey Kachkin <s.kachkin at> wrote:
>> Hi all,
>> i'm investigating the checkstop processing and looking for a way to isolate
>> a faulty component with OpenBmc.
>> So far SEL logs available via REST are not really helpful.
>> Is there any data source in the openbmc to troubleshoot checkstops?
>> I guess eSEL binary data parsed with can be more informative but do
>> we have any procedure to grab the binary sel data and parse it with the
>> latest obmc?
>> Currently it seems that IPL checkstop analysis is not really working. i mean
>> that faulty component is not deconfigured on the next boot and gard list is
>> empty.
>> It can be easily duplicated by injecting an error manually via putscom.
> I think you've identified an area that would be great for improvement.
> I'd like to expand the scope beyond just checkstop to other boot
> failures: I've tried to boot machines recently that have failed to
> even start hostboot, and I haven't known what has failed.
> A tool that inspects recent error logs, and the state of the SBE would
> be useful. We can leverage libpdbg to talk to the host.

The SBE stores some state information in cfam 2809 that we can use to
find out the currents istep. I think we can also dump the SBE trace
buffer out of PIB memory on non-secure systems too. Parsing the trace
buffer requires the tracehash file from the SBE build, but we can
probably able to add that to the squashfs file for the host firmware.

> Cheers,
> Joel

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