[openfirmware] Can't get /pci/display ihandle under vbox&laptop

[Mitch Bradley]

svn revision 2222 adds a VESA linear framebuffer driver.  To enable it, 
start with config-usbkey.fth and comment-out "create use-ega" and 
uncomment "create use-vesa".

The device node is named "/display".  It has the rectangular graphics 
extensions.  It uses 32 bits-per-pixel if it can find a suitable mode
with that depth, otherwise it uses 16 bits-per-pixel.

On 5/24/2011 7:11 PM, Mitch Bradley wrote:
> Here's a recipe for accessing VESA graphics from OFW in VirtualBox.
>
> Make a bootable USB stack with OFW, using pre-v4 syslinux (it might work
> with v4 syslinux but I haven't tried it).
>
> Follow the instructions at
> http://www.pendrivelinux.com/boot-a-usb-flash-drive-in-virtualbox/ to
> make VirtualBox boot from the USB stick. Those instructions did not work
> exactly for me - the Create Virtual Machine - Virtual Hard Disk dialog
> could not find usb.vmdk . I solved that by using the Settings menu to
> replace the default IDE drive with usb.vmdk .
>
> Your virtual machine must have at least 245M of memory.
>
> Set up a piped serial port as described in section 3.9 of the VirtualBox
> manual.
>
> Start the virtual machine. When the ok prompt comes up, type "com1 io"
> to send the console to the virtual serial port.
>
> Type this:
>
> ok hex 142 set-linear-mode
>
> That should put the virtualbox emulator window into graphics mode
>
> ok 142 vesa-lfb-adr 10000 ff0000 lfill
>
> That should make part of the screen turn red.
>
>
> On 5/24/2011 5:15 PM, Mitch Bradley wrote:
>>
>>
>> On 5/24/2011 4:10 PM, 胡松涛 wrote:
>>> Hi,
>>>
>>> When I learn http://www.openfirmware.org/1275/practice/#graphics
>>> I found that: I Can't get /pci/display ihandle under vbox,
>>
>> That is because there is no suitable driver in the demo build.
>>
>> VirtualBox emulates a linear frame buffer that is managed with VESA BIOS
>> extensions. The demo build, when running under syslinux, has some words
>> to access VESA BIOS functions - they are defined in
>> cpu/x86/pc/biosload/callvbe.fth . You could use them to put the display
>> into VESA linear framebuffer mode, then access the framebuffer with the
>> functions in dev/video/common/rectangl.fth .
>>
>> You would need to use a serial console for this, because as soon as you
>> switched to VESA linear mode, you would lose the text-mode console
>> display.
>>
>> when I boot
>>> up with usb-disk on my laptop, I can't get ihandle as well.
>>
>> Again, the problem is the lack of a driver for the graphics card on your
>> laptop. Modern PC graphics cards are very complex, and often
>> undocumented.
>>
>> If your laptop has a conventional BIOS that supports VESA, you could use
>> the VESA technique outlined above to access its display in graphics
>> mode. If it has an EFI BIOS, some other technique would be required.
>>
>>>
>>> but I can get /pci/vga ihandle under qemu. And it works fine with
>>> graphics.
>>
>> qemu emulates an old Cirrus logic display controller for which OFW has a
>> driver (the source code is in dev/video/cirrus.bth).
>>
>> Which graphics methods are you using with /pci/vga ?
>>
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