Merge branch 'feature/custom_partition_table_csv_path' into 'master'

Allow providing custom PARTITION_TABLE_CSV_PATH

Provide direct absolute path to CSV, without project_path

Github pull request #296: https://github.com/espressif/esp-idf/pull/296

See merge request !469

components/partition_table/Makefile.projbuild

@@ -14,10 +14,12 @@ GEN_ESP32PART := $(PYTHON) $(COMPONENT_PATH)/gen_esp32part.py -q
 # Has a matching value in bootloader_support esp_flash_partitions.h
 PARTITION_TABLE_OFFSET := 0x8000
 
+ifndef PARTITION_TABLE_CSV_PATH
 # Path to partition CSV file is relative to project path for custom
 # partition CSV files, but relative to component dir otherwise.$
 PARTITION_TABLE_ROOT := $(call dequote,$(if $(CONFIG_PARTITION_TABLE_CUSTOM),$(PROJECT_PATH),$(COMPONENT_PATH)))
 PARTITION_TABLE_CSV_PATH := $(call dequote,$(abspath $(PARTITION_TABLE_ROOT)/$(subst $(quote),,$(CONFIG_PARTITION_TABLE_FILENAME))))
+endif
 
 PARTITION_TABLE_BIN := $(BUILD_DIR_BASE)/$(notdir $(PARTITION_TABLE_CSV_PATH:.csv=.bin))