增加ota文件系统编译方法；（注意每次swupdate_make_recovery_img需要删除根目录和./lichee/linux下的.config和.config.old）

target/allwinner/v851s3-fastboot_sl100_front/busybox-init-base-ota-files/etc/udhcpd.conf

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+# Sample udhcpd configuration file (/etc/udhcpd.conf)
+# Values shown are defaults
+
+# The start and end of the IP lease block
+start		172.168.10.100
+end		172.168.10.254
+
+# The interface that udhcpd will use
+#interface	wlan0
+interface	usb0
+
+# The maximum number of leases (includes addresses reserved
+# by OFFER's, DECLINE's, and ARP conflicts). Will be corrected
+# if it's bigger than IP lease block, but it ok to make it
+# smaller than lease block.
+#max_leases	254
+
+# The time period at which udhcpd will write out a dhcpd.leases
+# file. If this is 0, udhcpd will never automatically write a
+# lease file. Specified in seconds.
+#auto_time	7200
+
+# The amount of time that an IP will be reserved (leased to nobody)
+# if a DHCP decline message is received (seconds)
+#decline_time	3600
+
+# The amount of time that an IP will be reserved
+# if an ARP conflict occurs (seconds)
+#conflict_time	3600
+
+# How long an offered address is reserved (seconds)
+#offer_time	60
+
+# If client asks for lease below this value, it will be rounded up
+# to this value (seconds)
+#min_lease	60
+
+# The location of the leases file
+#lease_file	/var/lib/misc/udhcpd.leases
+
+# The location of the pid file
+#pidfile	/var/run/udhcpd.pid
+
+# Every time udhcpd writes a leases file, the below script will be called
+#notify_file			# default: no script
+#notify_file	dumpleases	# useful for debugging
+
+# The following are bootp specific options
+# next server to use in bootstrap
+#siaddr		192.168.0.22	# default: 0.0.0.0 (none)
+# tftp server name
+#sname		zorak		# default: none
+# tftp file to download (e.g. kernel image)
+#boot_file	/var/nfs_root	# default: none
+
+# Static leases map
+#static_lease 00:60:08:11:CE:4E 192.168.0.54
+#static_lease 00:60:08:11:CE:3E 192.168.0.44
+
+# The remainder of options are DHCP options and can be specified with the
+# keyword 'opt' or 'option'. If an option can take multiple items, such
+# as the dns option, they can be listed on the same line, or multiple
+# lines.
+# Examples:
+opt	dns	172.168.10.2 172.168.10.10
+option	subnet	255.255.255.0
+opt	router	172.168.10.1
+opt	wins	172.168.10.1
+option	dns	129.219.13.81	# appended to above DNS servers for a total of 3
+option	domain	local
+option	lease	864000		# default: 10 days
+# Arbitrary option in hex form:
+option	0x08	01020304	# option 8: "cookie server IP addr: 1.2.3.4"
+
+# Currently supported options (for more info, see options.c):
+#opt lease      NUM
+#opt subnet     IP
+#opt broadcast  IP
+#opt router     IP_LIST
+#opt ipttl      NUM
+#opt mtu        NUM
+#opt hostname   STRING		# client's hostname
+#opt domain     STRING		# client's domain suffix
+#opt search     STRING_LIST	# search domains
+#opt nisdomain  STRING
+#opt timezone   NUM		# (localtime - UTC_time) in seconds. signed
+#opt tftp       STRING		# tftp server name
+#opt bootfile   STRING		# tftp file to download (e.g. kernel image)
+#opt bootsize   NUM		# size of that file
+#opt rootpath   STRING		# (NFS) path to mount as root fs
+#opt wpad       STRING
+#opt serverid   IP		# default: server's IP
+#opt message    STRING		# error message (udhcpd sends it on success too)
+# Options specifying server(s)
+#opt dns        IP_LIST
+#opt wins       IP_LIST
+#opt nissrv     IP_LIST
+#opt ntpsrv     IP_LIST
+#opt lprsrv     IP_LIST
+#opt swapsrv    IP
+# Obsolete options, no longer supported
+#opt logsrv     IP_LIST	# 704/UDP log server (not syslog!)
+#opt namesrv    IP_LIST	# IEN 116 name server, obsolete (August 1979!!!)
+#opt cookiesrv  IP_LIST	# RFC 865 "quote of the day" server, rarely (never?) used
+#opt timesrv    IP_LIST	# RFC 868 time server, rarely (never?) used