[rescue] sun ultra 10 ethernet controller

[Ray Brooks]

Hi team,
  A strange issue I'm having. I've recently acquired a Sun Ultra 10 and am
doing my best to get it working without much luck. I'm able to get it to
netboot, which is great, but only for a bit. Invariably, at some point
during the installation process, the computer completely hangs. If I'm
lucky I get an ok> prompt from OBP but whatever happens, the keyboard and
serial console remain unresponsive.

 To date, I've tried replacing all the socketed stuff on the mobo (RAM,
CPU, NVRAM) without success.

I have noticed that the CPIO-ASIC (dp83840avce) is getting very hot. This
would normally indicate to me that this IC is probably borked. According to
the functional description of the mobo in the service manua
<https://support.oracle.com/handbook_partner/data/805/805-0423/pdf/805-0423-11.pdf>l
(page C-2) for the Ultra 10, the NVRAM is controlled by the PCIO-ASIC, as
well as the serial comms controllers, and the SuperIO chip (which handles
kb/mouse/parallel port/diskette interface). It is possible that at some
point I plugged an NVRAM chip in backwards and I'm wondering if this might
have been the cause of the issue.

Essentially, I'd like to know if my understanding is correct. Could a blown
NVRAM short current across the EBus? If so, will replacing the CPIO-ASIC IC
fix the issue, or is it likely to recur in the case that my assumption
relating to the incorrect NVRAM insertion is false? I would be extremely
grateful for a second opinion on the matter.

Thanks in advance for any insight!

Ray
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sunhelp.org/pipermail/rescue_sunhelp.org/attachments/20220824/a60c18e1/attachment.html>