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 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 NVRAM in a format that OS X understands, a problem for another day. > I don't know about using binary. The way we do it now seems just fine. ASCII parsing in a driver sucks. > 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. Cheers, Ben.
