- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

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

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

Trim read/write sizes to 128 bytes. Pages are only 128 bytes in size.
Writes larger than this will wrap to the same page. Reads larger than
this are permitted, but why take chances.

Update partitions to reflect "sam9 demo" defaults.
Update i2c devices to just include the eeprom.
Update dataflash chip select to be CS 1 (this doesn't work yet and
needs changes to at91_spi and the spibus infrastructure).
Fix typo in comment.

Add preliminary support for Atmel SAM9260-EK evaluation kit.
Initially identical to the Ethernut5, but will diverge shortly before
I refactor...

- Correct the comments regarding the sizes of some partitions in the
DataFlash.
- Add a mapping for the Nut/OS configuration DataFlash partition according
to the board manual (but not known to either Linux or U-Boot (patches).

Add glue/support for the SAM9XE512-based Ethernut 5 boards. Currently,
all integrated and on-board peripherals except the DataFlash (at91_spi(4)
and at45d(4) still need to be unb0rken) and NAND Flash (missing NAND
framework) are working.
AFAICT, this makes FreeBSD the first operating system besides Nut/OS
supporting Ethernut 5 out of tree.