Review request -- splitting OF enumeration from nexus

[Justin Hibbits]

On Mon, Nov 1, 2010 at 11:04 AM, Justin Hibbits <jrh29 at alumni.cwru.edu>wrote:

> On Sun, Oct 31, 2010 at 4:44 PM, Nathan Whitehorn <nwhitehorn at freebsd.org>wrote:
>
>> Nexus on OF platforms doesn't behave like nexus on x86, which generates
>> some periodic difficulty with cryptosoft or syscons attaching to all devices
>> and taking over the system when someone makes a wrong assumption. I have
>> done some work to split out OF enumeration into a new, acpi(4)-like bus
>> called ofwbus that does all of the OF enumeration previously done by
>> nexus(4). The patch can be found at
>> http://people.freebsd.org/~nwhitehorn/ofwbus.diff.
>>
>> Doing this also provides a number of other benefits: it shares code
>> between PowerPC and sparc64, unifies the AIM and Book-E nexus
>> implementations on PPC, and makes it easier to have non-Open Firmware
>> platforms on PPC (the original motivation for the work). I have tested this
>> code with no obvious problems on a variety of Apple PPC machines and a Sun
>> Ultra 5. More testing and comments would be much appreciated. If no has any
>> objections, I will commit these changes in 2 weeks.
>> -Nathan
>>
>
> Building world now, and will test when I get home this evening.
>
> A note to others:  powerpc/powerpc/nexus.c is a resurrected file, so I
> needed to copy it from powerpc/aim/nexus.c before the patch would apply.
>
> - Justin
>
>
It's been up for 13 hours now with no problems.  Machine: G4 1.25GHz MDD.

- Justin