Re: Sun4/110 "Panic: Crazy Interrupts"

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

Hello!

I'm not sure exactly how (if at all) these commands translate into
Sunmon commands... not having access to OpenBoot in the PROM does
impact my options a little. I will see if I can find a resource on how
this could be done from SunOS 4 since I'm not sure Sunmon can do this
at all.

No rush on the 4/330 though - this is my hobby project after all! I
appreciate all the help from you folks on the SPARC mailing list.

Thanks,
Samuel


On Fri, May 3, 2024 at 9:46 AM Julian Coleman <jdc%coris.org.uk@localhost> wrote:
>
> Hi,
>
> > I'm not sure I understand the P4 register readout - but here's what it is:
> > `P4 register = 0x4261699584x`
>
> That should have been in hex - 0xfe046000.  However, I'm puzzled by this.
> We already identified the CG4 and resolution of 1152x900.  So, I would
> expect that the value starts 0x41 (the top 8 bits are model and resolution
> if I'm reading pfourreg.h correctly).  Video is currently on (obviously!) so
> I would also expect the that bit to be set.  With my guess of interrupts
> enabled, I was expecting to see something like 0x41000022.  So, I must be
> missing something or we're not actually referencing the correct location in
> cgfourattach().
>
> > We still panic on the same line (bt->bt_addr[0]):
> > `cpu0: data fault: pc=0xf00122cc addr=0xfe048000 ser=0x8020<WRITE,TIMEOUT>`
>
> I wonder if this is related to the above and we need to check the addresses
> that we're actually reading/writing.
>
> Unfortunately, I'll not have access to my 4/330 for a few weeks, so I'll
> not be able to run some comparisons on the BW2 that I have there.
>
> > No such luck commenting out the cmap lines unfortunately; still just
> > stray interrupts.
>
> Presumably because we weren't able to disable them earlier.
>
> It might be possible to get some information from the PROM prompt.  Instead
> of booting, can you try something like the following - guessing because I
> don't know how the 4/110 PROM behaves - it might be too old for these to
> work.
>
>   cd /
>   cd obio
>   cd bwtwo
>   .attributes   # this might be .properties
>   cd ..
>   cd cgfour
>   .attributes   # this might be .properties
>
> You should also be able to use `ls` in case I have the names of some of the
> device tree wrong.  For example, on my SS2, I have a BW2 framebuffer and it
> appears as "/sbus@1,f8000000/bwtwo@3,0" but I can type "cd /sbus/bwtwo".
>
> Regards,
>
> Julian
>
> --