diff --git a/Makefile b/Makefile
index 2af0707c..07a2ff9d 100644
--- a/Makefile
+++ b/Makefile
@@ -2,23 +2,25 @@
 #
 .NOTPARALLEL:
 
-# SDK version NodeMCU is locked to
-SDK_VER:=2.2.0
+# SDK base version, as released by Espressif
+SDK_BASE_VER:=2.2.0
 
-# no patch: SDK_BASE_VER equals SDK_VER and sdk dir depends on sdk_extracted
-SDK_BASE_VER:=$(SDK_VER)
-SDK_DIR_DEPENDS:=sdk_extracted
-# with patch: SDK_BASE_VER differs from SDK_VER and sdk dir depends on sdk_patched
-#SDK_BASE_VER:=1.5.4
-#SDK_DIR_DEPENDS:=sdk_patched
+# no patch: SDK_VER equals SDK_BASE_VER and sdk dir depends on sdk_extracted
+#SDK_VER:=$(SDK_BASE_VER)
+#SDK_DIR_DEPENDS:=sdk_extracted
+
+# with patch: SDK_VER differs from SDK_BASE_VER and sdk dir depends on sdk_patched
+SDK_PATCH_VER:=f8f27ce
+SDK_VER:=$(SDK_BASE_VER)-$(SDK_PATCH_VER)
+SDK_DIR_DEPENDS:=sdk_patched
 
 SDK_FILE_VER:=$(SDK_BASE_VER)
 SDK_FILE_SHA1:=8b63f1066d3560ff77f119e8ba30a9c39e7baaad
-#SDK_PATCH_VER:=$(SDK_VER)_patch_20160704
-#SDK_PATCH_SHA1:=388d9e91df74e3b49fca126da482cf822cf1ebf1
+SDK_PATCH_SHA1:=0bc21ec77b08488f04d3e1c9d161b711d07201a8
 # Ensure we search "our" SDK before the tool-chain's SDK (if any)
 TOP_DIR:=$(abspath $(dir $(lastword $(MAKEFILE_LIST))))
-SDK_DIR:=$(TOP_DIR)/sdk/esp_iot_sdk_v$(SDK_VER)
+SDK_REL_DIR=sdk/esp_iot_sdk_v$(SDK_VER)
+SDK_DIR:=$(TOP_DIR)/$(SDK_REL_DIR)
 CCFLAGS:= -I$(TOP_DIR)/sdk-overrides/include -I$(TOP_DIR)/app/include/lwip/app -I$(SDK_DIR)/include
 LDFLAGS:= -L$(SDK_DIR)/lib -L$(SDK_DIR)/ld $(LDFLAGS)
 
@@ -202,38 +204,41 @@ $(BINODIR)/%.bin: $(IMAGEODIR)/%.out
 # Should be done in top-level makefile only
 #
 
-all:	$(SDK_DIR_DEPENDS) pre_build .subdirs $(OBJS) $(OLIBS) $(OIMAGES) $(OBINS) $(SPECIAL_MKTARGETS)
+all:	sdk_pruned pre_build .subdirs $(OBJS) $(OLIBS) $(OIMAGES) $(OBINS) $(SPECIAL_MKTARGETS)
 
 .PHONY: sdk_extracted
 .PHONY: sdk_patched
+.PHONY: sdk_pruned
 
 sdk_extracted: $(TOP_DIR)/sdk/.extracted-$(SDK_BASE_VER)
 sdk_patched: sdk_extracted $(TOP_DIR)/sdk/.patched-$(SDK_VER)
+sdk_pruned: $(SDK_DIR_DEPENDS) $(TOP_DIR)/sdk/.pruned-$(SDK_VER)
 
 $(TOP_DIR)/sdk/.extracted-$(SDK_BASE_VER): $(TOP_DIR)/cache/v$(SDK_FILE_VER).zip
 	mkdir -p "$(dir $@)"
-	(cd "$(dir $@)" && rm -fr esp_iot_sdk_v$(SDK_VER) ESP8266_NONOS_SDK-$(SDK_VER) && unzip $(TOP_DIR)/cache/v$(SDK_FILE_VER).zip ESP8266_NONOS_SDK-$(SDK_VER)/lib/* ESP8266_NONOS_SDK-$(SDK_VER)/ld/eagle.rom.addr.v6.ld ESP8266_NONOS_SDK-$(SDK_VER)/include/* ESP8266_NONOS_SDK-$(SDK_VER)/bin/esp_init_data_default_v05.bin)
-	mv $(dir $@)/ESP8266_NONOS_SDK-$(SDK_VER) $(dir $@)/esp_iot_sdk_v$(SDK_VER)
+	(cd "$(dir $@)" && rm -fr esp_iot_sdk_v$(SDK_VER) ESP8266_NONOS_SDK-$(SDK_BASE_VER) && unzip $(TOP_DIR)/cache/v$(SDK_FILE_VER).zip ESP8266_NONOS_SDK-$(SDK_BASE_VER)/lib/* ESP8266_NONOS_SDK-$(SDK_BASE_VER)/ld/eagle.rom.addr.v6.ld ESP8266_NONOS_SDK-$(SDK_BASE_VER)/include/* ESP8266_NONOS_SDK-$(SDK_BASE_VER)/bin/esp_init_data_default_v05.bin)
+	mv $(dir $@)/ESP8266_NONOS_SDK-$(SDK_BASE_VER) $(dir $@)/esp_iot_sdk_v$(SDK_BASE_VER)
+	touch $@
+
+$(TOP_DIR)/sdk/.patched-$(SDK_VER): $(TOP_DIR)/cache/$(SDK_PATCH_VER).patch
+	mv $(dir $@)/esp_iot_sdk_v$(SDK_BASE_VER) $(dir $@)/esp_iot_sdk_v$(SDK_VER)
+	git apply --verbose -p1 --exclude='*VERSION' --exclude='*bin/at*' --directory=$(SDK_REL_DIR) $<
+	touch $@
+
+$(TOP_DIR)/sdk/.pruned-$(SDK_VER):
 	rm -f $(SDK_DIR)/lib/liblwip.a $(SDK_DIR)/lib/libssl.a $(SDK_DIR)/lib/libmbedtls.a
 	ar d $(SDK_DIR)/lib/libmain.a time.o
 	ar d $(SDK_DIR)/lib/libc.a lib_a-time.o
 	touch $@
 
-$(TOP_DIR)/sdk/.patched-$(SDK_VER): $(TOP_DIR)/cache/esp_iot_sdk_v$(SDK_PATCH_VER).zip
-	mkdir -p "$(dir $@)/patch"
-	(cd "$(dir $@)/patch" && unzip $(TOP_DIR)/cache/esp_iot_sdk_v$(SDK_PATCH_VER)*.zip *.a esp_init_data_default.bin && mv *.a $(SDK_DIR)/lib/ && mv esp_init_data_default.bin $(SDK_DIR)/bin/)
-	rmdir $(dir $@)/patch
-	rm -f $(SDK_DIR)/lib/liblwip.a
-	touch $@
-
 $(TOP_DIR)/cache/v$(SDK_FILE_VER).zip:
 	mkdir -p "$(dir $@)"
 	wget --tries=10 --timeout=15 --waitretry=30 --read-timeout=20 --retry-connrefused https://github.com/espressif/ESP8266_NONOS_SDK/archive/v$(SDK_FILE_VER).zip -O $@ || { rm -f "$@"; exit 1; }
 	(echo "$(SDK_FILE_SHA1)  $@" | sha1sum -c -) || { rm -f "$@"; exit 1; }
 
-$(TOP_DIR)/cache/esp_iot_sdk_v$(SDK_PATCH_VER).zip:
+$(TOP_DIR)/cache/$(SDK_PATCH_VER).patch:
 	mkdir -p "$(dir $@)"
-	wget --tries=10 --timeout=15 --waitretry=30 --read-timeout=20 --retry-connrefused http://espressif.com/sites/default/files/sdks/esp8266_nonos_sdk_v$(SDK_PATCH_VER).zip -O $@ || { rm -f "$@"; exit 1; }
+	wget --tries=10 --timeout=15 --waitretry=30 --read-timeout=20 --retry-connrefused "https://github.com/espressif/ESP8266_NONOS_SDK/compare/v$(SDK_BASE_VER)...$(SDK_PATCH_VER).patch" -O $@ || { rm -f "$@"; exit 1; }
 	(echo "$(SDK_PATCH_SHA1)  $@" | sha1sum -c -) || { rm -f "$@"; exit 1; }
 
 clean: