[OpenPower-Firmware] [POWER8] OCC Firdata over IPMI

[Artem Senichev]

On Wed, May 29, 2019 at 09:59:54AM +0930, Andrew Jeffery wrote:
> On Wed, 29 May 2019, at 07:03, Douglas Gilbert wrote:
> > Everything I have observed so far has the correct ecc calculation. 
> > Another thing that could cause the symptom being see is that the pnor 
> > as not been erased. If the existing value of a pnor 8 byte field is ff 
> > ff ff ff ff ff ff ff 00 and new data is written w/o an "erase" then the 
> > new data would look fine, except the ecc byte would not be changed from 
> > 00.
> > When does the erase happen?
> > 
> 
> mboxd performs the erase when flushing changed regions to flash.
> 
> Artem: It might be interesting to capture the DBus traffic when the OCC FIR data
> write occurs. It might help determine whether it's the protocol parameters or
> the data that is broken. This can be done with:
> 
> # busctl capture > /tmp/dbus.pcap
> 
> Separately, was there a github issue open for this? I think it's probably time
> we tracked the problem somewhere more convenient than on a mailing list.

Guys, I think we did not understand one another :)

OCC doesn't use IPMI to send FIRDATA, despite it has support for this.
This is the problem. Using SFC for writing causes ECC errors.

Other components of OpenPOWER firmware work with PNOR flash over IPMI,
only OCC cannot do it this way.

I created issue on github:
https://github.com/open-power/occ/issues/24

-- 
Regards,
Artem Senichev
Software Engineer, YADRO.