As it stands the Qemu_VGA is a pci device, and Qemu loads an Option rom, but it’s the VGA Bios and Opennbios doesn’t probe for option roms. Openbios has the Fcode for the Qemu-Vga device and there is a NDRV that gets loaded from a file.

What we really need is to make a proper FCode Rom image with the NDRV for the Qemu_VGA device, we could make a hybrid Bios/Fcode rom and not have to change the code in Qemu at all, I don’t think.

Here are some instructions on setting up and building Openbios on OS X Intel.

There is an effective tutorial on the openbios site. If you run OSX, you nee to install the fcode utils and use the awos cross compiler linked to: http://www.mediafire.com/download/wy5xg ... pilers.zip

This is my script to build the OpenBIOS binary:
PATH=:/usr/local/ppcelf/ppcelf/bin:/users/hsp/src/fcode-utils-devel/toke:$PATH
export PATH
cd openbios
CROSS_COMPILE=ppc-elf- ./config/scripts/switch-arch ppc
#(remove -Werror from CFLAGS in Makefile.target in top directory)
make

Best,
Cat_7

I forget the file that has the Forth for the Qemu_VGA device, Mark?

Also SLOF has some code for probing option roms for at least the GeForce 6600 PCI-E card, so that maybe something we can use to add support for option roms to OB.

\ *****************************************************************************

\ * Copyright (c) 2004, 2008 IBM Corporation

\ * All rights reserved.

\ * This program and the accompanying materials

\ * are made available under the terms of the BSD License

\ * which accompanies this distribution, and is available at

\ * http://www.opensource.org/licenses/bsd-license.php

\ *

\ * Contributors:

\ *     IBM Corporation - initial implementation

\ ****************************************************************************/

my-space pci-class-name type

my-space pci-device-generic-setup

pci-io-enable

pci-mem-enable

30 config-l@  pci-find-fcode execute-rom-fcode

: check-display ( nodepath len -- true|false ) \ true if display found and "screen" alias set

\ check if display available, set screen alias

2dup find-node \ ( path len phandle|0 ) find node

?dup IF

   \ node found, get "display-type" property

   s" display-type" rot get-property ( path len true|propaddr proplen 0 )

   0= IF

      ( path len propaddr proplen ) \ property found, check if the value is not "NONE"

      s" NONE" 0 char-cat ( path len propaddr proplen str strlen ) \ null-terminated NONE string

      str= 0= IF

         ( path len ) \ "display-type" property is not "NONE" so we can set "screen" alias

         s" screen" 2swap set-alias 

         true ( true ) \  return true

      ELSE

         2drop false ( false ) \ return false

      THEN

   THEN

THEN

;

get-node node>path s" /NVDA,DISPLAY-A" $cat check-display

0= IF

   \ no display found on DISPLAY-A ... check DISPLAY-B

   get-node node>path s" /NVDA,DISPLAY-B" $cat check-display

   drop \ drop result 

THEN

s" name" get-my-property drop s"  ( " type type s"  ) " type cr