brcm2708: rename target to bcm27xx

This change makes the names of Broadcom targets consistent by using
the common notation based on SoC/CPU ID (which is used internally
anyway), bcmXXXX instead of brcmXXXX.
This is even used for target TITLE in make menuconfig already,
only the short target name used brcm so far.

Despite, since subtargets range from bcm2708 to bcm2711, it seems
appropriate to use bcm27xx instead of bcm2708 (again, as already done
for BOARDNAME).

This also renames the packages brcm2708-userland and brcm2708-gpu-fw.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bcm27xx/base-files/lib/preinit/05_set_preinit_iface_brcm2708

@@ -0,0 +1,22 @@
+#!/bin/sh
+# Copyright (C) 2015-2016 OpenWrt.org
+# Copyright (C) 2017 LEDE project
+
+set_preinit_iface() {
+	. /lib/functions.sh
+
+	case "$(board_name)" in
+	raspberrypi,2-model-b |\
+	raspberrypi,2-model-b-rev2 |\
+	raspberrypi,3-model-b |\
+	raspberrypi,3-model-b-plus |\
+	raspberrypi,4-model-b |\
+	raspberrypi,model-b |\
+	raspberrypi,model-b-plus |\
+	raspberrypi,model-b-rev2)
+		ifname=eth0
+		;;
+	esac
+}
+
+boot_hook_add preinit_main set_preinit_iface

target/linux/bcm27xx/base-files/lib/preinit/79_move_config

@@ -0,0 +1,20 @@
+#!/bin/sh
+# Copyright (C) 2015 OpenWrt.org
+
+. /lib/upgrade/common.sh
+
+BOOTPART=/dev/mmcblk0p1
+
+move_config() {
+	if [ -b $BOOTPART ]; then
+		insmod nls_cp437
+		insmod nls_iso8859-1
+		insmod fat
+		insmod vfat
+		mkdir -p /boot
+		mount -t vfat -o rw,noatime $BOOTPART /boot
+		[ -f "/boot/$BACKUP_FILE" ] && mv -f "/boot/$BACKUP_FILE" /
+	fi
+}
+
+boot_hook_add preinit_mount_root move_config

target/linux/bcm27xx/base-files/lib/upgrade/keep.d/platform

@@ -0,0 +1 @@
+/boot/config.txt

target/linux/bcm27xx/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,99 @@
+. /lib/functions.sh
+
+REQUIRE_IMAGE_METADATA=1
+
+# copied from x86's platform.sh
+
+platform_check_image() {
+	local diskdev partdev diff
+
+	[ "$#" -gt 1 ] && return 1
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
+
+	get_partitions "/dev/$diskdev" bootdisk
+
+	#extract the boot sector from the image
+	get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
+
+	get_partitions /tmp/image.bs image
+
+	#compare tables
+	diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+
+	rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
+
+	if [ -n "$diff" ]; then
+		echo "Partition layout has changed. Full image will be written."
+		ask_bool 0 "Abort" && exit 1
+		return 0
+	fi
+
+	return 0;
+}
+
+platform_do_upgrade() {
+	local diskdev partdev diff
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
+
+	sync
+
+	if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
+		get_partitions "/dev/$diskdev" bootdisk
+
+		#extract the boot sector from the image
+		get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
+
+		get_partitions /tmp/image.bs image
+
+		#compare tables
+		diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+	else
+		diff=1
+	fi
+
+	if [ -n "$diff" ]; then
+		get_image "$@" | dd of="/dev/$diskdev" bs=2M conv=fsync
+
+		# Separate removal and addtion is necessary; otherwise, partition 1
+		# will be missing if it overlaps with the old partition 2
+		partx -d - "/dev/$diskdev"
+		partx -a - "/dev/$diskdev"
+
+		return 0
+	fi
+
+	#iterate over each partition from the image and write it to the boot disk
+	while read part start size; do
+		if export_partdevice partdev $part; then
+			echo "Writing image to /dev/$partdev..."
+			get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
+		else
+			echo "Unable to find partition $part device, skipped."
+	fi
+	done < /tmp/partmap.image
+
+	#copy partition uuid
+	echo "Writing new UUID to /dev/$diskdev..."
+	get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
+}
+
+platform_copy_config() {
+	local partdev
+
+	if export_partdevice partdev 1; then
+		mkdir -p /boot
+		[ -f /boot/kernel.img ] || mount -t vfat -o rw,noatime "/dev/$partdev" /boot
+		cp -af "$UPGRADE_BACKUP" "/boot/$BACKUP_FILE"
+		tar -C / -zxvf "$UPGRADE_BACKUP" boot/config.txt
+		sync
+		unmount /boot
+	fi
+}