Bump buidlroot version to 2018.02.6

bsp/buildroot/board/qemu/x86_64/linux-4.15.config

@@ -1,4 +1,5 @@
 CONFIG_SYSVIPC=y
+CONFIG_CGROUPS=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_SMP=y
@@ -8,6 +9,9 @@ CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y
 CONFIG_INET=y
+# CONFIG_WIRELESS is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_VIRTIO_BLK=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_SCSI_VIRTIO=y
@@ -17,14 +21,15 @@ CONFIG_NETDEVICES=y
 CONFIG_VIRTIO_NET=y
 CONFIG_NE2K_PCI=y
 CONFIG_8139CP=y
+# CONFIG_WLAN is not set
 CONFIG_INPUT_EVDEV=y
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_VIRTIO_CONSOLE=y
 CONFIG_HW_RANDOM_VIRTIO=m
 CONFIG_DRM=y
-CONFIG_DRM_BOCHS=y
 CONFIG_DRM_QXL=y
+CONFIG_DRM_BOCHS=y
 CONFIG_DRM_VIRTIO_GPU=y
 CONFIG_SOUND=y
 CONFIG_SND=y
@@ -41,5 +46,7 @@ CONFIG_VIRTIO_INPUT=y
 CONFIG_VIRTIO_MMIO=y
 CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
 CONFIG_EXT4_FS=y
+CONFIG_AUTOFS4_FS=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_UNWINDER_FRAME_POINTER=y

bsp/buildroot/board/qemu/x86_64/readme.txt

@@ -1,9 +1,9 @@
 Run the emulation with:
 
-  qemu-system-x86_64 -M pc -kernel output/images/bzImage -drive file=output/images/rootfs.ext2,if=virtio,format=raw -append root=/dev/vda -net nic,model=virtio -net user
+  qemu-system-x86_64 -M pc -kernel output/images/bzImage -drive file=output/images/rootfs.ext2,if=virtio,format=raw -append "root=/dev/vda" -net nic,model=virtio -net user
 
 Optionally add -smp N to emulate a SMP system with N CPUs.
 
 The login prompt will appear in the graphical window.
 
-Tested with QEMU 2.5.0
+Tested with QEMU 2.9.0