Re: Sun4/110 "Panic: Crazy Interrupts"

[Samuel Furtaw <samfurtaw%gmail.com@localhost>]

Hi!

The panic DDB isn't wanting to take input for me, so I added printf's
to find the line number. It looks like we crash at line 304:
```
bt->bt_addr = 0
```

I was able to get a video capture of the traceback, at least:
https://www.youtube.com/watch?v=9g2g0rYFGqc

Thanks,
Samuel

On Tue, Apr 16, 2024 at 2:23 PM Julian Coleman <jdc%coris.org.uk@localhost> wrote:
>
> Hi,
>
> I wrote:
>
> > > I assume here that the CG4 driver doesn't handle something on the 4/110.
>
> and the crash is:
>
> > > 0: data fault: pc=0xf0012090 addr=0xfe04800 ser=0x8002<WRITE,SZERR>
>
> and if we look at the log message for R1.31 of the BW2 driver:
>
>   http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/dev/sun/bwtwo.c?only_with_tag=MAIN
>
> I made a change to only write 32 bits at a time to avoid WRITE,SZERR crashes
> on P4 framebuffers.  We must be writing more than 32 bits somewhere, maybe
> when we initialise the Brooktree DAC.  As I wrote in the earlier mail, it
> would be good to get the backtrace/line number.
>
> Regards,
>
> Julian