Bump buidlroot version to 2018.02.6

bsp/buildroot/board/freescale/imx6-sabresd/linux_qt5.fragment

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+# Currently mx6sabresd exhibits touchscreen issues when running cpufreq as
+# ondemand governor with a mainline kernel.
+# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
+CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
+CONFIG_VIDEO_CODA=m

bsp/buildroot/board/freescale/imx6-sabresd/readme.txt

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+*******************************
+Freescale i.MX6 Sabre SD boards
+*******************************
+
+This file documents the Buildroot support for the Freescale i.MX6 Sabre SD
+boards based on i.MX6Q, i.MX6DL and iMX6QP.
+
+Thanks to the SPL support in U-Boot it is possible to run a single
+sdcard.img in all i.MX6 Sabre SD board variants.
+
+This configuration uses U-Boot mainline and kernel mainline.
+
+Build
+=====
+
+First, configure Buildroot for the i.MX6 Sabre SD board:
+
+  make imx6-sabresd_defconfig
+
+Build all components:
+
+  make
+
+You will find the following files in output/images/ :
+  - imx6q-sabresd.dtb
+  - imx6dl-sabresd.dtb
+  - imx6qp-sabresd.dtb
+  - rootfs.ext4
+  - rootfs.tar
+  - sdcard.img
+  - u-boot.imx
+  - zImage
+
+Create a bootable SD card
+=========================
+
+To determine the device associated to the SD card have a look in the
+/proc/partitions file:
+
+  cat /proc/partitions
+
+Buildroot prepares a bootable "sdcard.img" image in the output/images/
+directory, ready to be dumped on a SD card. Launch the following
+command as root:
+
+  dd if=output/images/sdcard.img of=/dev/<your-sd-device>
+
+*** WARNING! This will destroy all the card content. Use with care! ***
+
+For details about the medium image layout, see the definition in
+board/freescale/common/imx/genimage.cfg.template.
+
+Boot the i.MX6 Sabre SD board
+=============================
+
+To boot your newly created system:
+- insert the SD card in the SD3 slot of the board (close to the HDMI connector);
+- put a micro USB cable into the Debug USB Port and connect using a terminal
+  emulator at 115200 bps, 8n1;
+- power on the board.
+
+Testing graphics on the i.MX6 Sabre SD board
+============================================
+
+The imx6-sabresd_qt5_defconfig allows to quickly test the graphics
+capabilities of i.MX6 using the opensource Etnaviv graphics stack
+and kernel mainline.
+
+In order to build it:
+
+make imx6-sabresd_qt5_defconfig
+make
+
+Then flash the SD card as explained above.
+
+Running kmscube application:
+
+# kmscube
+
+Running Qt5 Cinematic Demo:
+
+# export QT_QPA_EGLFS_KMS_CONFIG=/root/sabresd.json
+# /usr/share/Qt5/CinematicExperience/Qt5_CinematicExperience
+
+Running gl2mark benchmark:
+
+# glmark2-es2-drm
+
+Testing video playback on the i.MX6 Sabre SD board
+==================================================
+
+As the mx6sabresd has two display outputs (LVDS and HDMI), it is necessary to
+know what is the connector that corresponds to the HDMI output.
+
+This information can be found by running:
+
+# modetest
+
+And search for the HDMI connector number. In our case it shows up as 37.
+
+In the mx6sabresd prompt run the following Gstreamer pipeline:
+
+# gst-launch-1.0 filesrc location=/root/trailer_1080p_h264_mp3.avi ! avidemux ! \
+h264parse ! v4l2video1dec capture-io-mode=dmabuf ! kmssink connector-id=37    \
+name=imx-drm sync=0
+
+(The video used on this example was retrieved from:
+http://linode.boundarydevices.com/videos/trailer_1080p_h264_mp3.avi)
+
+Enjoy!

bsp/buildroot/board/freescale/imx6-sabresd/rootfs_overlay/root/sabresd.json

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+{
+  "device": "/dev/dri/card0",
+  "hwcursor": false,
+  "pbuffers": true,
+  "outputs": [
+    {
+      "name": "HDMI-1",
+      "mode": "off"
+    },
+    {
+      "name": "LVDS-1",
+      "mode": "1024x768"
+    }
+  ]
+}