octeontx: add support for OCTEON TX target

The Cavium OCTEON TX is an ARM 64-bit SoC leveraging CPU cores and
periperhals from the Cavium ThunderX SoC.

This initial support provides a 4.14 kernel and kernel+initramfs that is
bootable on the Gateworks Newport GW630x as well as the Cavium sff8104
reference board.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

target/linux/octeontx/base-files/lib/octeontx.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+#
+# Copyright (C) 2018 OpenWrt.org
+#
+
+octeontx_board_detect() {
+	local machine
+	local name
+
+	machine=$(cat /proc/device-tree/model)
+	board=$(cat /proc/device-tree/board)
+
+	case "$machine" in
+	"Cavium ThunderX CN81XX board")
+		name="cn81xx"
+		;;
+
+	*)
+		name="generic"
+		;;
+	esac
+
+	case "$board" in
+	GW630*)
+		name="gw630x"
+		;;
+	esac
+
+	[ -e "/tmp/sysinfo" ] || mkdir -p "/tmp/sysinfo"
+
+	echo "$name" > /tmp/sysinfo/board_name
+	echo "$machine" > /tmp/sysinfo/model
+}
+
+octeontx_board_name() {
+	local name
+
+	[ -f /tmp/sysinfo/board_name ] || octeontx_board_detect
+	[ -f /tmp/sysinfo/board_name ] && name=$(cat /tmp/sysinfo/board_name)
+	[ -z "$name" ] && name="unknown"
+
+	echo "$name"
+}