[OE-core] image.bbclass: USE_DEVFS is now useless

[Richard Purdie]

On Tue, 2014-04-01 at 13:01 -0500, Mark Hatle wrote:
> On 4/1/14, 12:51 PM, Richard Purdie wrote:
> > On Tue, 2014-04-01 at 18:48 +0100, Phil Blundell wrote:
> >> Also note that the default for USE_DEVFS was (and is) 1, so the lack
> >> of this check is actually causing a difference in the default
> >> behaviour.  If there's no appetite for reinstating the USE_DEVFS
> >> mechanism per se then it seems like it would be a good idea to make
> >> the default IMAGE_DEVICE_TABLE be blank in order to restore the
> >> previous default of no /dev in the rootfs.
> >>
> >> At present you get a somewhat arbitrary-seeming smattering of devices
> >> from meta/files/device_table-minimal.txt, including such anachronisms
> >> as /dev/ttySA0 and /dev/apm_bios.  It's hard to imagine that anybody
> >> actually wants this stuff in their rootfs in this day and age.
> >
> > Can we kill apmd at the same time? Please? :)
> 
> Isn't this still used on some ARM and MIPS targets?  (they emulate apm for basic 
> power management.)

Its not gone as far as I know but whether we need the userspace portion,
I'm not so sure, it just does suspend/resume event notifuication afaik
these days and I doubt much uses that now. The battery interfaces were
long since replaced with proper sysfs ones.

Cheers,

Richard