Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC 263301

In kernel config files, it is supposed to be 'options<space><tab>' not
'options<tab><tab>', per long standing (but recently not so strictly
enforced) convention.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Back out r253779 & r253786.

Decouple yarrow from random(4) device.

* Make Yarrow an optional kernel component -- enabled by "YARROW_RNG" option.
The files sha2.c, hash.c, randomdev_soft.c and yarrow.c comprise yarrow.

* random(4) device doesn't really depend on rijndael-*. Yarrow, however, does.

* Add random_adaptors.[ch] which is basically a store of random_adaptor's.
random_adaptor is basically an adapter that plugs in to random(4).
random_adaptor can only be plugged in to random(4) very early in bootup.
Unplugging random_adaptor from random(4) is not supported, and is probably a
bad idea anyway, due to potential loss of entropy pools.
We currently have 3 random_adaptors:
+ yarrow
+ rdrand (ivy.c)
+ nehemeiah

* Remove platform dependent logic from probe.c, and move it into
corresponding registration routines of each random_adaptor provider.
probe.c doesn't do anything other than picking a specific random_adaptor
from a list of registered ones.

* If the kernel doesn't have any random_adaptor adapters present then the
creation of /dev/random is postponed until next random_adaptor is kldload'ed.

* Fix randomdev_soft.c to refer to its own random_adaptor, instead of a
system wide one.

Submitted by: arthurmesh@gmail.com, obrien
Obtained from: Juniper Networks
Reviewed by: obrien

Migrate the AR71xx UART (an 8250 derivative) to hide behind uart_ar71xx.

The AR9330/AR9331 UART is a totally different thing, so having it included
with 'uart' is not going to work out.

Remove duplicated GEOM_PART_* options.

PR: 170931
Approved by: adrian

Begin modifying the PB92 config file to actually generate a flashable,
bootable image.

The kernel has to fit inside an 896KiB area in a 4MB SPI flash.
So a bunch of stuff can't be included (and more is to come), including
(unfortunately) IPv6.

TODO:

* GPIO modules need to be created
* Shrink the image a bit more by removing some of the CAM layer debugging
strings.

Flip on these debugging options by default. This is -HEAD after all.

Use new option names for NFS client and NFS server

See UPDATING entry for 20110427

Add nvram2env (untested) and geom_map (tested) to PB92.

An example configuration file for the Atheros PB92.

TODO:

* pcie doesn't yet work properly, I'm working on it.
* if_arge doesn't work - it's likely the phy mask is wrong; again I'm working on it.