On Sep 20, 2016, at 8:41 PM, Benjamin Herrenschmidt wrote:

On Tue, 2016-09-20 at 20:35 -0400, G 3 wrote:

When I use the -prom-env option I can easily add properties to the
options node.
Can something like this be done with the chosen node?

We can make it so. That or we can add code to OpenBIOS to copy the list
of resolutions into the device-node of the VGA device. The latter is
probably the best, that way we can also have all the default ones in
OpenBIOS and remove the hard coded list completely.

You really want to remove the included list of resolutions? I was thinking about adding a lot more built-in resolutions in another patch. A built-in list is very convenient.

As for the options node problem. We need a way to add resolutions from the command-line for a Mac OS X guest. Using "-prom-env" isn't an option because of some unknown bug. I suppose it is possible to fix this bug - if it is a bug. Another idea I have is to add a completely different command-line option to QEMU just for resolutions. The user could specify resolutions like this: -video- resolutions 640x480,1024x768,1280x700.... This feature could place the list of resolutions inside a property of the VGA device node. I am betting the VGA driver could access this node and parse the list of resolutions. So this: qemu -video-resolutions ---> OpenBIOS VGA device node ---> VGA driver

Would anyone have another idea they would like to share?

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