Added boot files for raspberry pi 3.

test/circle/README.txt

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+TESTING SAMPLES ON RASPBERRY PI 3
+
+To test a sample on Raspberry Pi 3, for example "slaveinfo", you need to:
+
+- compile the slaveinfo sample, using "make",
+  you need arm-none-eabi- toolchain being in your PATH;
+  this will generate the kernel8-32.img file.
+  
+- copy all content of the "boot/" directory into an empty SD-card;
+
+- copy "kernel8-32.img" into the SD-card;
+
+Now your SD-card should be bootable.

test/circle/boot/LICENCE.broadcom

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+Copyright (c) 2006, Broadcom Corporation.
+Copyright (c) 2015, Raspberry Pi (Trading) Ltd
+All rights reserved.
+
+Redistribution.  Redistribution and use in binary form, without
+modification, are permitted provided that the following conditions are
+met:
+
+* This software may only be used for the purposes of developing for, 
+  running or using a Raspberry Pi device.
+* Redistributions must reproduce the above copyright notice and the
+  following disclaimer in the documentation and/or other materials
+  provided with the distribution.
+* Neither the name of Broadcom Corporation nor the names of its suppliers
+  may be used to endorse or promote products derived from this software
+  without specific prior written permission.
+
+DISCLAIMER.  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
+

test/circle/boot/Makefile

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+#
+# Download the firmware files to be required for boot (requires wget)
+#
+# These files must be copied along with the generated kernel.img
+#     onto a SD(HC) card with FAT file system.
+#
+
+all: clean
+	wget -q -O LICENCE.broadcom https://github.com/raspberrypi/firmware/blob/master/boot/LICENCE.broadcom?raw=true
+	wget -q -O bootcode.bin https://github.com/raspberrypi/firmware/blob/master/boot/bootcode.bin?raw=true
+	wget -q -O fixup.dat https://github.com/raspberrypi/firmware/blob/master/boot/fixup.dat?raw=true
+	wget -q -O start.elf https://github.com/raspberrypi/firmware/blob/master/boot/start.elf?raw=true
+
+clean:
+	rm -f bootcode.bin fixup.dat start.elf LICENCE.broadcom

test/circle/boot/config.txt

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+kernel=kernel8-32.img
+kernel_address=0x00000000
+enable_uart=1
+init_uart_baud=115200
+init_uart_clock=3000000