<div dir="auto"><div dir="auto">Hi Peter,<div dir="auto"> Thanks for your thoughts. It's reassuring to know that it's unlikely I've caused any permanent damage with any inverted NVRAM. I know I've done it at least once in my SS20 and that has remained solid as a rock.</div><div dir="auto"><br></div><div dir="auto"> I have indeed run through the diagnostic suite in the EPROM when I can get to that point and everything checks out fine.</div><div dir="auto"><br></div><div dir="auto">I've just realised that that diagnostic result in fact supports the idea that it is the PCIO-ASIC at fault. When it is working, all diagnostic tests should pass and the computer would function normally.</div><div dir="auto"><br></div><div dir="auto">When it is in a failure state, none of the peripherals on the EBus would be accessible. That's serial console, keyboard and mouse, Ethernet and a few other bits. The CPU would probably still be capable of processing instructions until the watchdog kicks in. Video output would still work, which correlates exactly with what I see.</div><div dir="auto"><br></div><div dir="auto">However, it doesn't get me closer to knowing what might have caused the PCIO-ASIC to fail. I think I'll just attempt to replace it as they're reasonably cheap and certainly cheaper than sourcing a replacement mobo.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">Cheers!</div><div dir="auto"><br></div><div dir="auto">Ray</div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 24 Aug 2022, 16:30 Peter Stokes, <<a href="mailto:peter@ashlyn.co.uk" rel="noreferrer noreferrer" target="_blank">peter@ashlyn.co.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Hi Ray<div><br></div><div>I would not be too hung up on plugging the NVRAM in backwards, I would think a lot of us have done it at one time or another and it has never been an ongoing issue, even for the NVRAM, just tends to blank it out.</div><div><br></div><div>The U5/10 motherboards were always relatively high failure rate especially compared to most Sun boards.</div><div><br></div><div>Sorry no idea on suggestions what may be causing it however. We always just replaced the boards. You could try serial connection and enable NVRAM diagsto give it a good run through. </div><div><br></div><div>Peter<br><br><div dir="ltr">Sent from my iPad</div><div dir="ltr"><br><blockquote type="cite">On 24 Aug 2022, at 15:11, Ray Brooks <<a href="mailto:ray.userinterface@gmail.com" rel="noreferrer noreferrer noreferrer" target="_blank">ray.userinterface@gmail.com</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Hi team,<div> 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.</div><div><br></div><div> To date, I've tried replacing all the socketed stuff on the mobo (RAM, CPU, NVRAM) without success.</div><div><br></div><div>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 <a href="https://support.oracle.com/handbook_partner/data/805/805-0423/pdf/805-0423-11.pdf" rel="noreferrer noreferrer noreferrer" target="_blank">service manua</a>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.</div><div><br></div><div>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.</div><div><br></div><div>Thanks in advance for any insight!</div><div><br></div><div>Ray</div><div> </div></div>
<span>_______________________________________________</span><br><span>rescue list - <a href="http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org" rel="noreferrer noreferrer noreferrer" target="_blank">http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org</a></span><br></div></blockquote></div></div>_______________________________________________<br>
rescue list - <a href="http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org" rel="noreferrer noreferrer noreferrer noreferrer" target="_blank">http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org</a><br>
</blockquote></div></div>