[OpenBIOS] [PATCH v2] Implement copy-resolutions-property

[G 3]

On Oct 1, 2016, at 9:05 PM, Tarl Neustaedter wrote:

> On 2016-Oct-1 20:47 , G 3 wrote:
>>
>> Actually the Mac OS gets all its information from the VGA driver. It
>> would be
>> the VGA driver that would read the list in OpenBIOS. Currently the  
>> VGA
>> driver
>> needs the list to an array of integers.
>
>
> O.k. - misunderstood. The new VGA driver is a MacOS driver, not a
> OpenBIOS driver. So we aren't booting standard MacOS, but a modified
> version.

Actually we are booting a standard (unmodified) Mac OS.


> The traditional way information is passed (for IEEE1275 in Sun/Oracle
> style) from the outside world into drivers/operating systems is with
> properties in either /chosen or /options. Properties in /options mimic
> NVRAM variables, looking like they might have been set by the previous
> iteration of an operating system - that's probably not ideal, it might
> appear that the client OS could set them, which wouldn't be the case.
> Properties in /chosen are places where firmware stores anything it
> determines at startup for use by later clients.
>
> I would suggest in this case that /chosen would be your better  
> location
> than a device node.

I so wanted to use the /options node, but there is some bug between
OpenBIOS, QEMU, or Mac OS X that prevents Mac OS X from seeing
anything in the NVRAM. When Mac OS 9 boots it always displays this
error message pertaining to the NVRAM. So far no one knows how to
fix this problem, so using a property in the QEMU,VGA node is what
works.