ppc fails to attach to puc on 9.1-STABLE, 7.4-STABLE works

[Bruce Evans]

On Thu, 17 Jan 2013, John Baldwin wrote:

> On Wednesday, January 16, 2013 10:10:34 pm Bruce Evans wrote:
>> On Wed, 16 Jan 2013, Andre Albsmeier wrote:
>>
>>> On Tue, 15-Jan-2013 at 21:27:07 +0100, John Baldwin wrote:

>>>>> [reading flags in the driver]
>>>> This should not be needed for "flags".  Look for 'devflags' in
>>>> sys/kern/subr_bus.c.  The kernel always reads the current 'flags' hint during
>>>> device probe and stores them in dev->devflags and leaves them there after a
>>>> successful probe (so they should be seen by attach).  Specifically, note:
>>>>
>>>> 		/* Set the winning driver, devclass, and flags. */
>>
>> So the flags interface is unusable before some driver "wins".
>
> No, we set it twice.  Specifically, it is set before each probe, then it is
> set again after a winning driver is chosen so that the proper flags exist
> during attach as well.

Why didn't it work for Andre then?

It might be a layering problem, with the flags not working because the
hint says that they are for ppc but the bus name being puc.  I thought
that this problem was fixed.  In FreeBSD-~5.2, I had to add flags
reading to sio_pci.c and sio_puc.c to get flags for sio actually seen
by sio when the bus is not isa.  subr_bus.c does the 2 settings of the
flags much the same in FreeBSD-~5.2, but this certainly doesn't work.

Bruce