Re: Xwsfb on DECstation 5000/133 with PMAGB-B

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

> I've tried a few more permutations:
> 
> NetBSD 7.2 X11R6 sets on a 9.99.92 system, X starts then immediately quits, monitor shows:
> 
> XdecNetBSD: screen 0: HX (SFB), 1280x1024
> X connection to :0.0 broken

I saw this several times. Could you confirm your settings?

- make sure 'ldd /usr/X11R6/bin/XdecNetBSD' shows all linked shlibs
  are available
- make sure to extract a whole X11R6 (NetBSD 7.2) xfonts.tgz set
  (xfonts in /usr/X11R7 don't work)
- 'ktrace /usr/X11R6/bin/XdecNetBSD' then check kdump(1) output

> Is there any debug I can enable that might help with finding out
> why Xorg on 10.0 doesn't work on my PMAGB-B?

The current Xorg server with xf86-video-wsfb requires
mmap(2) with WSDISPLAY_MODE_DUMBFB set by WSDISPLAYIO_SMODE ioctl(2):
 https://github.com/NetBSD/xsrc/blob/698f741c39b8267f3e3af22cea83f06c4e5e6996/external/mit/xf86-video-wsfb/dist/src/wsfb_driver.c#L870
 https://github.com/NetBSD/xsrc/blob/698f741c39b8267f3e3af22cea83f06c4e5e6996/external/mit/xf86-video-wsfb/dist/src/wsfb_driver.c#L929

However looks src/sys/dev/sfb.c (and other traditional DEC derived
framebuffer drivers) doesn't provide it for generic wsfb driver
(i.e. dumb fb only access without accelerations via device registers).
 https://github.com/NetBSD/src/blob/635c4e7ee7570e1e42d915233cface78a330cd48/sys/dev/tc/sfb.c#L483

I guess implementing WSDISPLAY_MODE_DUMBFB might be trivial, like this:
 https://github.com/NetBSD/src/blob/635c4e7ee7570e1e42d915233cface78a330cd48/sys/dev/pci/machfb.c#L2031

I'll dig out my 5000/125 from closet later.
 https://dmesgd.nycbug.org/index.cgi?do=view&id=6179

---
Izumi Tsutsui