[openfirmware] Troubleshooting VGA under qemu?

[James Cameron]

On Wed, Sep 30, 2015 at 10:04:36AM +0000, Marcin Cieslak wrote:
> 1) Would that be possible to have a dual-console mode (similar to
> what FreeBSD early bootloader has) so that both vga and serial
> console are active? ofw prints messages on the serial console even
> if disabled, only input is not working.

I'm surprised serial console doesn't take input, but I haven't used
OFW for QEMU for a long time.  Add ofw/core/muxdev.fth to build?

> 2) Initially I thought ofw is completely dead and I have run it
> under gdb, only to figure out I am running in the Forth inner
> interpreter:
> 
>    0xff9fc000:  lods   %ds:(%esi),%eax
> => 0xff9fc001:  jmp    *(%eax)
> 
> Is there any way to have "symbol table" to map word addresses to the
> word names? (I figured out I can tick the word to get its address).

Nothing obvious springs to mind.

A variant of "words" that prints addresses?

A replacement of ":" that prints name and address during build?

On Wed, Sep 30, 2015 at 11:53:46AM +0000, Marcin Cieslak wrote:
> So, I got it working.
> 
> The solution was:
> 
> Index: cpu/x86/pc/emu/emuofw.bth
> ===================================================================
> --- cpu/x86/pc/emu/emuofw.bth   (wersja 3782)
> +++ cpu/x86/pc/emu/emuofw.bth   (kopia robocza)
> @@ -25,6 +25,7 @@
>  in: ${BP}/dev/video/build/vmsvga.fc
>  in: ${BP}/dev/ne2000/build/ne2kpci.fc
>  in: ${BP}/dev/amd79970/build/vmlance.fc
> +in: ${BP}/dev/video/build/bga.fc
>  \ in: ${BP}/dev/video/build/video.fc
>  in: ${BP}/cpu/x86/pc/biosload/linux.fth
>  
> @@ -58,6 +59,7 @@
>  \ Just use a driver targeted at the specific chipset that QEMU emulates
>     " ${BP}/dev/video/build/cirrus.fc"           " pci1013,b8"      $add-deflated-dropin
>     " ${BP}/dev/video/build/vmsvga.fc"           " pci15ad,405"     $add-deflated-dropin
> +   " ${BP}/dev/video/build/bga.fc"              " pci1234,1111"    $add-deflated-dropin
>  
>     " ${BP}/dev/ne2000/build/ne2kpci.fc"         " pci10ec,8029"    $add-deflated-dropin
>     " ${BP}/dev/amd79970/build/vmlance.fc"       " pci1022,2000"    $add-deflated-dropin
> 
> 
> Newer QEMU offers Bochs VGA adapter

Thanks.  Want me to commit?

Do you happen to know which version of QEMU switched to Bochs?

-- 
James Cameron
http://quozl.linux.org.au/