[OpenBIOS] Probing the PCI bus for Option ROMs.

[Jd Lyons]

Joe, if it would be something that interests you, and you have the time, we could work on adding proper PCI Probing to Openbios.

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 <http://www.mediafire.com/download/wy5xgj2hwjp8k4k/AWOS_Cross-Compilers.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

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