Bump buildroot to version 2017-02

TG-3 #closed

bsp/buildroot/board/digilent/zybo/readme.txt

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+Digilent Zybo
+=============
+
+This is the Buildroot board support for the Digilent Zybo. The Zybo is
+a development board based on the Xilinx Zynq-7000 based All-Programmable
+System-On-Chip.
+
+Zybo information including schematics, reference designs, and manuals are
+available from http://store.digilentinc.com/zybo-zynq-7000-arm-fpga-soc-trainer-board/ .
+
+If you want a custom FPGA bitstream to be loaded by U-Boot, copy it as
+system.bit in board/digilent/zybo/.
+
+Steps to create a working system for Zybo:
+
+1) make zynq_zybo_defconfig
+2) make
+3) write your SD Card with the sdcard.img file using dd by doing
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+4) insert the SD Card and power up your Zybo
+5) Expect serial console on the second USB serial port exposed by the board
+
+The expected output:
+
+ U-Boot SPL 2016.05 (May 20 2016 - 16:16:24)
+ mmc boot
+ Trying to boot from MMC1
+ reading system.dtb
+ spl_load_image_fat_os: error reading image system.dtb, err - -1
+ reading u-boot-dtb.img
+ reading u-boot-dtb.img
+
+
+ U-Boot 2016.05 (May 20 2016 - 16:16:24 +0200)
+
+ Model: Zynq ZYBO Development Board
+ Board: Xilinx Zynq
+ I2C:   ready
+ DRAM:  ECC disabled 512 MiB
+ MMC:   sdhci@e0100000: 0
+ SF: Detected S25FL128S_64K with page size 256 Bytes, erase size 64 KiB, total 16 MiB
+ In:    serial@e0001000
+ Out:   serial@e0001000
+ Err:   serial@e0001000
+ Model: Zynq ZYBO Development Board
+ Board: Xilinx Zynq
+ Net:   ZYNQ GEM: e000b000, phyaddr 0, interface rgmii-id
+ I2C EEPROM MAC address read failed
+
+ Warning: ethernet@e000b000 (eth0) using random MAC address - 56:64:dd:a7:6d:94
+ eth0: ethernet@e000b000
+ ...
+
+Resulting system
+----------------
+Once the build process is finished you will have an image called "sdcard.img"
+in the output/images/ directory.
+
+The first partition is a FAT32 partition created at the beginning of the SD Card
+that contains the following files :
+    /BOOT.BIN
+    /zynq-zybo.dtb
+    /uEnv.txt
+    /system.bit
+    /uImage
+    /u-boot-dtb.img
+
+The second partition is an ext4 partition that contains the root filesystem.
+
+You can alter the booting procedure by modifying the uEnv.txt file
+in first partition of the SD card. It is a plain text file in format
+<key>=<value> one per line:
+
+kernel_image=myimage
+modeboot=myboot
+myboot=...