Re: Question about xserve G5
"Brandon Bergren" <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.ppc |
|---|---|
| Message-ID | <[email protected]> |
On Fri, Oct 30, 2020, at 10:02 AM, Javi Hotmail wrote: > Is there any documentation that I could read about this? Also why is not > possible from the kernel to run functions from the DT?. I just started > looking at the code now; It seems to me that depends on some sort of > openfirmware functionality. Why is this? > > Regards, > It's not possible because we don't have an implementation of the platform function interpreter written. If someone were to write a BSD-licensed platform function interpreter, it would be pretty easy to hook it in. The (GPL) linux interpreter is an example of a platform function interpreter. https://github.com/torvalds/linux/blob/master/arch/powerpc/platforms/powermac/pfunc_core.c Darwin has one as well but when I looked at it it was a bunch of Objective C that would be less work to just reimplement rather than trying to use. (I think the license wasn't BSD either) The device tree has a series of platform functions that contain bytecode that the kernel runs to do a function like change the cpu clockrate, etc. It's done this way so it can be run without having to context-switch, and have platform drivers that automatically work on all Mac99 machines. I'm not sure off the top of my head what documentation there is available. _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-ppc To unsubscribe, send any mail to "[email protected]"