Merge from bittboy/buildroot@26c91a9

board/firefly/roc-rk3399-pc/extlinux.conf

@@ -0,0 +1,4 @@
+label RK3399RocPC linux
+  kernel /boot/Image
+  devicetree /boot/rk3399-roc-pc.dtb
+  append earlycon=uart8250,mmio32,0xff1a0000 root=/dev/mmcblk0p1 rootwait

board/firefly/roc-rk3399-pc/genimage.cfg

@@ -0,0 +1,22 @@
+image sdcard.img {
+	hdimage {
+	}
+
+	partition u-boot-tpl-spl-dtb {
+		in-partition-table = "no"
+		image = "idbloader.img"
+		offset = 32K
+	}
+
+	partition u-boot-dtb {
+		in-partition-table = "no"
+		image = "u-boot.itb"
+		offset = 8M
+		size = 30M
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

board/firefly/roc-rk3399-pc/post-build.sh

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+#!/bin/sh
+
+BOARD_DIR="$(dirname $0)"
+
+install -m 0644 -D $BOARD_DIR/extlinux.conf $TARGET_DIR/boot/extlinux/extlinux.conf

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