[source] sunxi: add sysupgrade support

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/5ece16fd237688f8f8d33cd4bbc5137733365215

commit 5ece16fd237688f8f8d33cd4bbc5137733365215
Author: Yousong Zhou <yszhou4tech at gmail.com>
AuthorDate: Wed Jan 4 22:19:29 2017 +0800

    sunxi: add sysupgrade support
    
    Enalbe builtin support for FAT filesystem as we need to mount boot
    partition to store sysupgrade.tgz there
    
    Signed-off-by: Yousong Zhou <yszhou4tech at gmail.com>
---
 .../sunxi/base-files/lib/preinit/79_move_config    | 20 +++++++
 .../linux/sunxi/base-files/lib/upgrade/platform.sh | 67 ++++++++++++++++++++++
 target/linux/sunxi/config-4.4                      |  4 ++
 3 files changed, 91 insertions(+)

diff --git a/target/linux/sunxi/base-files/lib/preinit/79_move_config b/target/linux/sunxi/base-files/lib/preinit/79_move_config
new file mode 100644
index 0000000..c112588
--- /dev/null
+++ b/target/linux/sunxi/base-files/lib/preinit/79_move_config
@@ -0,0 +1,20 @@
+#!/bin/sh
+# Copyright (C) 2012-2015 OpenWrt.org
+
+move_config() {
+	local partdev
+
+	. /lib/upgrade/common.sh
+
+	if export_bootdevice && export_partdevice partdev -1; then
+		if mount -t vfat -o rw,noatime "/dev/$partdev" /mnt; then
+			if [ -f /mnt/sysupgrade.tgz ]; then
+				mv -f /mnt/sysupgrade.tgz /
+			fi
+			umount /mnt
+		fi
+	fi
+}
+
+boot_hook_add preinit_mount_root move_config
+
diff --git a/target/linux/sunxi/base-files/lib/upgrade/platform.sh b/target/linux/sunxi/base-files/lib/upgrade/platform.sh
new file mode 100644
index 0000000..f2cd970
--- /dev/null
+++ b/target/linux/sunxi/base-files/lib/upgrade/platform.sh
@@ -0,0 +1,67 @@
+platform_check_image() {
+	true
+}
+
+platform_copy_config() {
+	local partdev
+
+	if export_partdevice partdev -1; then
+		mount -t vfat -o rw,noatime "/dev/$partdev" /mnt
+		cp -af "$CONF_TAR" /mnt/
+		umount /mnt
+	fi
+}
+
+platform_do_upgrade() {
+	local diskdev partdev ibs diff
+
+	if export_bootdevice && export_partdevice diskdev -2; then
+		sync
+		if [ "$SAVE_PARTITIONS" = "1" ]; then
+			get_partitions "/dev/$diskdev" bootdisk
+
+			#get block size
+			if [ -f "/sys/block/$diskdev/queue/physical_block_size" ]; then
+				ibs="$(cat "/sys/block/$diskdev/queue/physical_block_size")"
+			else
+				ibs=512
+			fi
+
+			#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)"
+			if [ -n "$diff" ]; then
+				echo "Partition layout is changed.  Full image will be written."
+				ask_bool 0 "Abort" && exit
+
+				get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+				return 0
+			fi
+
+			#write uboot image
+			get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 conv=notrunc
+			#iterate over each partition from the image and write it to the boot disk
+			while read part start size; do
+				part="$(($part - 2))"
+				if export_partdevice partdev $part; then
+					echo "Writing image to /dev/$partdev..."
+					get_image "$@" | dd of="/dev/$partdev" ibs="$ibs" obs=1M skip="$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
+		else
+			get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+		fi
+
+		sleep 1
+	fi
+}
diff --git a/target/linux/sunxi/config-4.4 b/target/linux/sunxi/config-4.4
index 816f44a..2253afa 100644
--- a/target/linux/sunxi/config-4.4
+++ b/target/linux/sunxi/config-4.4
@@ -162,6 +162,7 @@ CONFIG_F2FS_FS=y
 # CONFIG_F2FS_FS_SECURITY is not set
 CONFIG_F2FS_FS_XATTR=y
 CONFIG_F2FS_STAT_FS=y
+CONFIG_FAT_FS=y
 CONFIG_FB=y
 CONFIG_FB_CFB_COPYAREA=y
 CONFIG_FB_CFB_FILLRECT=y
@@ -347,6 +348,8 @@ CONFIG_NET_FLOW_LIMIT=y
 CONFIG_NET_PTP_CLASSIFY=y
 CONFIG_NET_VENDOR_ALLWINNER=y
 CONFIG_NLS=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y
 CONFIG_NO_BOOTMEM=y
 CONFIG_NO_HZ=y
 CONFIG_NO_HZ_COMMON=y
@@ -526,6 +529,7 @@ CONFIG_USERIO=y
 CONFIG_USE_OF=y
 CONFIG_VDSO=y
 CONFIG_VECTORS_BASE=0xffff0000
+CONFIG_VFAT_FS=y
 CONFIG_VFP=y
 CONFIG_VFPv3=y
 CONFIG_VHOST=y