lpt0 disappear (ppc related)

[takawata at jp.freebsd.org]

In message <20060501.222743.32503989.imp at bsdimp.com>, "M. Warner Losh" $B$5$s$$$o(B
$B$/(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.