[PATCH v5.5] of/fdt: export fdt blob as /sys/firmware/fdt

[Geoff Levand]

Hi Ian,

On Wed, 2014-11-19 at 13:09 +0000, Ian Campbell wrote:
> On Tue, 2014-11-18 at 22:11 +0000, Grant Likely wrote:
> > > > * It also helps with exposing the reserved map to userspace, but kexec
> > > >   has done without that feature for years, and it is in the process of
> > > >   being deprecated in favour of /reserved-memory anyway.
> > > 
> > > This is the first I'd heard of the reserve map being deprecated, and
> > > we're going to have DTs with reserved map entries for a long time going
> > > forwards.
> > 
> > Deprecated, not removed or disabled. It will still work pretty much
> > forever, but users should be encouraged to move to the reserve-memory
> > tree.
> 
> I'm curious why that should be for the "OS should never touch this, here
> be dragons" type memory, what are the benefits of the new scheme in that
> case?

/memreserve/ device tree entries are not available in /proc/device-tree,
but reserved-memory nodes are.  Some solution is needed to get all
reserved memory info into the dtb passed to the second stage kernel
during a kexec re-boot.

-Geoff