Merge from bittboy/buildroot@26c91a9

board/firefly/roc-rk3399-pc/readme.txt

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+Libre Computer Board ROC-RK3399-PC
+===================================
+
+Build:
+
+  $ make roc_pc_rk3399_defconfig
+  $ make
+
+Files created in output directory
+=================================
+
+output/images
+
+├── bl31.elf
+├── idbloader.img
+├── Image
+├── rk3399-roc-pc.dtb
+├── rootfs.ext2
+├── rootfs.ext4 -> rootfs.ext2
+├── rootfs.tar
+├── sdcard.img
+├── u-boot.bin
+└── u-boot.itb
+
+Creating bootable SD card:
+==========================
+
+Simply invoke (as root)
+
+sudo dd if=output/images/sdcard.img of=/dev/sdX && sync
+
+Where X is your SD card device
+
+Serial console
+--------------
+
+Baudrate for this board is 1500000
+
+Wiki link:
+https://wiki.amarulasolutions.com/bsp/rockchip/rk3399/roc-rk3399-pc.html