Re: lpt0 disappear (ppc related)

Warner Losh wrote this message on Wed, May 03, 2006 at 15:59 -0600:
> In message: <200605032151.k43Lpjg2009960_at_ns.init-main.com>
>             takawata_at_jp.freebsd.org writes:
> : In message <20060501.222743.32503989.imp_at_bsdimp.com>, "M. Warner Losh" ?$B$5$s$$$o
> : ?$B$/:
> : >In message: <200605020815.31012.doconnor_at_gsoft.com.au>
> : >            "Daniel O'Connor" <doconnor_at_gsoft.com.au> writes:
> : >: On Tuesday 02 May 2006 01:23, M. Warner Losh wrote:
> : >: > : However you wouldn't expect that using it as a module would result in
> : >: > : reduced functionality. (The same as how you wouldn't expect compiling
> : >: > : something into your kernel would result in reduced functionality)
> : >: >
> : >: > At the same time, you'd expect it to behave like every other 'bus' in
> : >: > the tree.  We omit the attachments for drivers to that bus when the
> : >: > kernel is built w/o that bus.  This is why if you have, say, ep in the
> : >: > kernel, but pccard loaded as a module, the 3c589 you just inserted
> : >: > into the pccard slot won't work.
> : >: >
> : >: > It is a minor imperfection in the config system that no one has taken
> : >: > on as a Problem To Solve.  Solving it turns out to be somewhat tricky.
> : >: 
> : >: Hmm, but I load acpi as a module and get acpi attachments.. (for sio and ppc
> : >)
> : >: 
> : >: <shrugs> it's black magic to me anyway :)
> : >: 
> : >: I didn't mean to belittle Marcel's work, I was just suprised that it would 
> : >: cause a functionality loss like that.
> : >
> : >I think it just points out a weakness in the underlying system...
> : 
> : Is it time to hide isa_dma interface under isa_if ?
> : All acpi capable archictectures links isa_if.c, I think.
> 
> Yes.  I think it would be worthwhile to have all the ISA symbols
> hidden, like we do for PC Card.  This would be a step in that
> direction...  Maybe the last step?

Yeh, it'd be good..  I don't plan on adding support for ISA to sun4v
till I don't have to define anoying symbols like isa_init just to get
it running.. :(

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."