1、目前使用的flash为128M，比较小，使用AB升级方式感觉空间不够，所以使用recovery升级linux

2、添加recovery分区

全志提供的SDK本来是不支持打包recovery分区的，需要修改sys_partition.fex，size也需要修改，否则编译失败

+++ b/configs/evb1/linux-5.4/sys_partition.fex
@@ -71,6 +71,6 @@ size = 252[partition]name         = recovery
-    size         = 23184
-    ;downloadfile = "recovery.fex"
+    size         = 44032
+    downloadfile = "recovery.fex"user_type    = 0x8000

3、编译recovery分区

需要执行swupdate_make_recovery_img编译recovery.img

如果使用./build.sh recovery编译、打包、烧录固件后，OTA升级失败，执行完upgrade_recovery后reboot卡在uboot无法进入kernel

[00.695]line:703 init_clocks
[00.698]drv_disp_init
[00.703]handle_num : 6
request pwm success, pwm7:pwm7:0x2000c00.
[00.714]drv_disp_init finish
[00.812]Loading Environment from SUNXI_FLASH... OK
[00.833]boot_gui_init:start
[00.836]set disp.dev2_output_type fail. using defval=0

4、升级失败

[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     mbr
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     boot-resource
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     env
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     env-redund
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     boot
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     rootfs
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     private
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     recovery
[TRACE] : SWUPDATE running :  [scan_ubi_volumes] : mtd3:    Volume found :     UDISK
[TRACE] : SWUPDATE running :  [install_single_image] : Found installer for stream recovery raw
[ERROR] : SWUPDATE failed [0] ERROR core/cpio_utils.c : copy_write : 97 : cannot write 16384 bytes: Operation not permitted
[TRACE] : SWUPDATE running :  [install_single_image] : Installer for raw not successful !
Software updated failed

根本原因：升级包中文件的介质与当前板子的介质不对应，不能操作分区

可以在设备端确认当前介质，执行ll /dev/by-name确认（例：当前为emmc介质，为mmc*，如果为nand ubi介质为ubi* 或 nand*）

打包OTA包时需要根据存储介质添加参数，如

$ swupdate_pack_swu -ubi

5、OTA包不需要包含recovery

固件已经包含recovery系统了，后续不修改的话OTA包可以不用包含recovery分区

需要修改sw-description-ubi和sw-subimgs-ubi.cfg两个文件

sw-subimgs-ubi.cfg：不打包recovery分区

+++ b/t113s2-evb1/swupdate/sw-subimgs-ubi.cfg
@@ -1,6 +1,6 @@swota_file_list=(openwrt/target/t113s2/t113s2-evb1/swupdate/sw-description-ubi:sw-description
-${LICHEE_PLAT_OUT}/recovery.img:recovery
+#${LICHEE_PLAT_OUT}/recovery.img:recovery${LICHEE_PLAT_OUT}/uboot.img:uboot${LICHEE_PLAT_OUT}/boot0.img:boot0${LICHEE_PLAT_OUT}/boot.img:kernel

sw-description-ubi：升级时不检测recovery分区文件

+++ b/t113s2-evb1/swupdate/sw-description-ubi
@@ -9,11 +9,11 @@ software =upgrade_recovery = {/* upgrade recovery */images: (
-                {
+                /*{filename = "recovery";volume = "recovery"installed-directly = true;
-                },
+                },*/{filename = "uboot";type = "awuboot";