Re: X problem on PMAGB-B

On 11/17/25 14:11, David Brownlee wrote:
>>>     But there is a strange offset to the video.  I've attached two pics
>>> which show what I mean.  See where my pointer has grabbed the window
>>> title bar in the second picture; I've actually grabbed the window and am
>>> dragging it, so that's where the X server thinks the window is.  But the
>>> actual displayed objects are shifted to the left.
>>
>> Hmm, sfb_common_init() adds another 4096 to the VRAM address, let's do
>> the same:
>>
>> Index: sfb.c
>> ===================================================================
>> RCS file: /cvsroot/src/sys/dev/tc/sfb.c,v
>> retrieving revision 1.89
>> diff -u -w -r1.89 sfb.c
>> --- sfb.c       6 Dec 2021 16:00:07 -0000       1.89
>> +++ sfb.c       17 Nov 2025 10:45:52 -0000
>> @@ -485,9 +485,9 @@
>>   {
>>          struct sfb_softc *sc = v;
>>
>> -       if (offset >= SFB_SIZE || offset < 0)
>> +       if (offset >= SFB_FB_SIZE || offset < 0)
>>                  return (-1);
>> -       return machine_btop(sc->sc_vaddr + offset);
>> +       return machine_btop(sc->sc_vaddr + SFB_FB_OFFSET + 4096 + offset);
>>   }
> 
> Updated builds with the + 4096 at https://sync.absd.org/pmax/  -
> should only need to update the kernel :)

   That's it, it works!  Pic attached.  Thank you to everyone involved 
for your input, and especially to Michael and David who did all the legwork.

   This -260 is now on permanent public exhibit at the Large Scale 
Systems Museum in Pittsburgh, dual-booting Ultrix-32 and NetBSD 10.1, 
for everyone to use and enjoy.

               Thanks,
               -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA