[OpenBIOS] [PATCH] Add resolutions via the command-line
programmingkidx at gmail.com
Thu Sep 22 01:18:53 CEST 2016
On Sep 21, 2016, at 5:53 PM, Benjamin Herrenschmidt wrote:
> On Wed, 2016-09-21 at 14:26 -0400, G 3 wrote:
>> Nodes like chose, aliases, openprom are of class IOService. options
>> is of class IODTNVRAM. It looks like this class has problems. I'm
>> thinking since Alexander Graf did work in the mac_nvram.c file, he
>> might know what is wrong.
> What is wrong is purely that MacOS X limits how you do things on that
> node. Have a look at the OS X kernel source :-) The implementation of
> the support libraries to run NDRVs is all there (module
> IOGraphicsFamily iirc).
I will check the IOGraphicsFamily kernel extension source code.
>> I found another way to access the options
>> node in Mac OS X. Use this command: ioreg -c IODTNVRAM. It stops at
>> the options node and prints this error message: "ioreg: error: can't
>> obtain properties" in QEMU. On a real Power Mac the command prints
>> all the properties of the options node just fine.
> Correct, part of the problem is that I think we don't emulate the
> in a format that OS X understands, a problem for another day.
If you know any more info please share. I would like to help fix this
>> I don't know about using binary. The way we do it now seems just
> ASCII parsing in a driver sucks.
All the code needed parse ASCII is already in the patch. But I will
try to see things your way.
>> I just need to figure out how to write to the /chosen node from the
>> QEMU command line. I found a function called OpenBIOS_set_var() in
>> openbios_firmware_abi.h, but it would require an address to write to.
>> So where do I find the address of the /chosen node....
> No, you don't. Do as I said. Have OpenBIOS construct the list of
> resolutions and put it in the node of the device itself.
That can be done, but I was hoping to be able to do this via a
That would make things so much easier on the user. Altering
OpenBIOS can be challenging using forth. OpenBIOS does support using
scripts so maybe someone could make a script that adds user
resolutions to the
QEMU,VGA node from the options node.
I'm hoping you had a look at version three of my patch. If there are
any other issues
with it, I would like to know before making version 4.
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