tegra: add new target

New target introduces initial support for NVIDIA Tegra SoC based devices.
It focuses on Tegra 2 CPUs, for successors supporting NEON instruction
set the target should be split in two subtargets.
This initial commit doesn't create any device image, it's groundwork
for further additions.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

2 files changed, 125 insertions, 0 deletions

diff --git a/target/linux/tegra/base-files/lib/preinit/79_move_config b/target/linux/tegra/base-files/lib/preinit/79_move_config
new file mode 100644
index 0000000000..2a451a5efd
--- /dev/null
+++ b/target/linux/tegra/base-files/lib/preinit/79_move_config
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+move_config() {
+	local partdev
+
+	. /lib/upgrade/common.sh
+
+	if export_bootdevice && export_partdevice partdev 1; then
+		mkdir -p /boot
+		if mount -o ro,noatime "/dev/$partdev" /boot; then
+			if [ -f /boot/sysupgrade.tgz ]; then
+				mount /boot -o remount,rw,noatime
+				mv -f /boot/sysupgrade.tgz /
+			fi
+			umount /boot
+			rm -fR /boot
+		fi
+	fi
+}
+
+boot_hook_add preinit_mount_root move_config
+
diff --git a/target/linux/tegra/base-files/lib/upgrade/platform.sh b/target/linux/tegra/base-files/lib/upgrade/platform.sh
new file mode 100644
index 0000000000..be453bdf9f
--- /dev/null
+++ b/target/linux/tegra/base-files/lib/upgrade/platform.sh
@@ -0,0 +1,103 @@
+REQUIRE_IMAGE_METADATA=1
+
+get_magic_at() {
+	local pos="$2"
+	get_image "$1" | dd bs=1 count=2 skip="$pos" 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
+}
+
+platform_check_image() {
+	local diskdev partdev diff
+
+	[ "$#" -gt 1 ] && return 1
+
+	case "$(get_magic_at "$1" 510)" in
+		55aa) ;;
+		*)
+			echo "Failed to verify MBR boot signature."
+			return 1
+		;;
+	esac
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
+
+	get_partitions "/dev/$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 "$diff" ]; then
+		echo "Partition layout has changed. Full image will be written."
+		ask_bool 0 "Abort" && exit 1
+		return 0
+	fi
+}
+
+platform_copy_config() {
+	local partdev
+
+	if export_partdevice partdev 1; then
+		mount -o rw,noatime "/dev/$partdev" /mnt
+		cp -af "$CONF_TAR" /mnt/
+		umount /mnt
+	fi
+}
+
+platform_do_upgrade() {
+	local diskdev partdev diff
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
+
+	sync
+
+	if [ "$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=4096 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
+}