esp32: Update to latest ESP IDF.

dpgeorge · dpgeorge · commit a5a4db370969 · 2017-01-05T11:16:48.000+11:00
Latest ESP IDF requires flash_partitions.c compiled into the bootloader.
It also removed the "KEEP" directive from some parts of the linker script
to reduce RAM usage for unused components, so we follow suit.
diff --git a/esp32/Makefile b/esp32/Makefile
@@ -508,7 +508,7 @@ all: $(BUILD)/bootloader.bin $(BUILD)/partitions.bin $(BUILD)/application.bin
 .PHONY: idf-version deploy erase
 
 idf-version:
-	$(ECHO) "IDF version: 05fcdcfedbff88959a5e98c4b44010ac92475b31"
+	$(ECHO) "IDF version: bf3093feca1f470bdd6caf45adf3b71492b84a19"
 
 deploy: $(BUILD)/bootloader.bin $(BUILD)/partitions.bin $(BUILD)/application.bin
 	$(ECHO) "Writing $^ to the board"
@@ -572,6 +572,7 @@ BOOTLOADER_OBJ = $(addprefix $(BUILD)/bootloader/$(ESPCOMP)/,\
 	bootloader_support/src/secure_boot.o \
 	bootloader_support/src/esp_image_format.o \
 	bootloader_support/src/flash_encrypt.o \
+	bootloader_support/src/flash_partitions.o \
 	log/log.o \
 	spi_flash/spi_flash_rom_patch.o \
 	micro-ecc/micro-ecc/uECC.o \
diff --git a/esp32/esp32.custom_common.ld b/esp32/esp32.custom_common.ld
@@ -99,7 +99,7 @@ SECTIONS
     *(.sbss2.*)
     *(.gnu.linkonce.sb2.*)
     *(.dynbss)
-    KEEP(*(.bss))
+    *(.bss)
     *(.bss.*)
     *(.share.mem)
     *(.gnu.linkonce.b.*)
@@ -111,17 +111,17 @@ SECTIONS
   .dram0.data :
   {
     _data_start = ABSOLUTE(.);
-    KEEP(*(.data))
-    KEEP(*(.data.*))
-    KEEP(*(.gnu.linkonce.d.*))
-    KEEP(*(.data1))
-    KEEP(*(.sdata))
-    KEEP(*(.sdata.*))
-    KEEP(*(.gnu.linkonce.s.*))
-    KEEP(*(.sdata2))
-    KEEP(*(.sdata2.*))
-    KEEP(*(.gnu.linkonce.s2.*))
-    KEEP(*(.jcr))
+    *(.data)
+    *(.data.*)
+    *(.gnu.linkonce.d.*)
+    *(.data1)
+    *(.sdata)
+    *(.sdata.*)
+    *(.gnu.linkonce.s.*)
+    *(.sdata2)
+    *(.sdata2.*)
+    *(.gnu.linkonce.s2.*)
+    *(.jcr)
     *(.dram1 .dram1.*)
     *libesp32.a:panic.o(.rodata .rodata.*)
     _data_end = ABSOLUTE(.);
