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Posted to commits@nuttx.apache.org by xi...@apache.org on 2021/12/21 13:02:52 UTC
[incubator-nuttx] 02/05: xtensa/esp32: Refactor makefiles for compliance to Function Call Syntax
This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git
commit d22a2aa7a015857d53f47ae490a54bd908cb7813
Author: Gustavo Henrique Nihei <gu...@espressif.com>
AuthorDate: Thu Nov 11 15:06:31 2021 -0300
xtensa/esp32: Refactor makefiles for compliance to Function Call Syntax
According to Make documentation:
- "Commas and unmatched parentheses or braces cannot appear in the text
of an argument as written";
- "Leading spaces cannot appear in the text of the first argument as
written".
Although in the current state it was not resulting in parsing issues, it
is better to fix it.
Signed-off-by: Gustavo Henrique Nihei <gu...@espressif.com>
---
arch/xtensa/src/esp32/Bootloader.mk | 131 +++++++++++++++---------------------
tools/esp32/Config.mk | 67 +++++++++---------
2 files changed, 83 insertions(+), 115 deletions(-)
diff --git a/arch/xtensa/src/esp32/Bootloader.mk b/arch/xtensa/src/esp32/Bootloader.mk
index 3de2f64..d29ed00 100644
--- a/arch/xtensa/src/esp32/Bootloader.mk
+++ b/arch/xtensa/src/esp32/Bootloader.mk
@@ -31,6 +31,11 @@ BOOTLOADER_CONFIG = $(CHIPDIR)/bootloader.conf
$(BOOTLOADER_SRCDIR):
$(Q) git clone $(BOOTLOADER_URL) $(BOOTLOADER_SRCDIR) -b $(BOOTLOADER_VERSION)
+# Helpers for creating the configuration file
+
+cfg_en = echo "$(1)=$(if $(CONFIG_ESP32_APP_FORMAT_MCUBOOT),1,y)";
+cfg_val = echo "$(1)=$(2)";
+
# Commands for colored and formatted output
RED = \033[1;31m
@@ -49,75 +54,45 @@ ifeq ($(CONFIG_ESP32_SECURE_BOOT),y)
fi
endif
$(Q) echo "Creating Bootloader configuration"
- $(Q) { \
- $(if $(CONFIG_ESP32_FLASH_2M), echo "CONFIG_ESPTOOLPY_FLASHSIZE_2MB=y";) \
- $(if $(CONFIG_ESP32_FLASH_4M), echo "CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y";) \
- $(if $(CONFIG_ESP32_FLASH_8M), echo "CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y";) \
- $(if $(CONFIG_ESP32_FLASH_16M), echo "CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y";) \
- $(if $(CONFIG_ESP32_FLASH_MODE_DIO), echo "CONFIG_ESPTOOLPY_FLASHMODE_DIO=y";) \
- $(if $(CONFIG_ESP32_FLASH_MODE_DOUT), echo "CONFIG_ESPTOOLPY_FLASHMODE_DOUT=y";) \
- $(if $(CONFIG_ESP32_FLASH_MODE_QIO), echo "CONFIG_ESPTOOLPY_FLASHMODE_QIO=y";) \
- $(if $(CONFIG_ESP32_FLASH_MODE_QOUT), echo "CONFIG_ESPTOOLPY_FLASHMODE_QOUT=y";) \
- $(if $(CONFIG_ESP32_FLASH_FREQ_80M), echo "CONFIG_ESPTOOLPY_FLASHFREQ_80M=y";) \
- $(if $(CONFIG_ESP32_FLASH_FREQ_40M), echo "CONFIG_ESPTOOLPY_FLASHFREQ_40M=y";) \
- $(if $(CONFIG_ESP32_FLASH_FREQ_26M), echo "CONFIG_ESPTOOLPY_FLASHFREQ_26M=y";) \
- $(if $(CONFIG_ESP32_FLASH_FREQ_20M), echo "CONFIG_ESPTOOLPY_FLASHFREQ_20M=y";) \
+ $(Q) { \
+ $(if $(CONFIG_ESP32_FLASH_2M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHSIZE_2MB)) \
+ $(if $(CONFIG_ESP32_FLASH_4M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHSIZE_4MB)) \
+ $(if $(CONFIG_ESP32_FLASH_8M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHSIZE_8MB)) \
+ $(if $(CONFIG_ESP32_FLASH_16M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHSIZE_16MB)) \
+ $(if $(CONFIG_ESP32_FLASH_MODE_DIO),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHMODE_DIO)) \
+ $(if $(CONFIG_ESP32_FLASH_MODE_DOUT),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHMODE_DOUT)) \
+ $(if $(CONFIG_ESP32_FLASH_MODE_QIO),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHMODE_QIO)) \
+ $(if $(CONFIG_ESP32_FLASH_MODE_QOUT),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHMODE_QOUT)) \
+ $(if $(CONFIG_ESP32_FLASH_FREQ_80M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHFREQ_80M)) \
+ $(if $(CONFIG_ESP32_FLASH_FREQ_40M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHFREQ_40M)) \
+ $(if $(CONFIG_ESP32_FLASH_FREQ_26M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHFREQ_26M)) \
+ $(if $(CONFIG_ESP32_FLASH_FREQ_20M),$(call cfg_en,CONFIG_ESPTOOLPY_FLASHFREQ_20M)) \
} > $(BOOTLOADER_CONFIG)
ifeq ($(CONFIG_ESP32_APP_FORMAT_MCUBOOT),y)
- $(eval KEYDIR := $(TOPDIR)/$(ESPSEC_KEYDIR))
- $(eval APP_SIGN_KEY := $(abspath $(KEYDIR)/$(subst ",,$(CONFIG_ESP32_SECURE_BOOT_APP_SIGNING_KEY))))
- $(Q) { \
- $(if $(CONFIG_ESP32_SECURE_BOOT), \
- echo "CONFIG_SECURE_BOOT=y"; \
- echo "CONFIG_SECURE_BOOT_V2_ENABLED=y"; \
- echo "CONFIG_ESP_SIGN_KEY_FILE=$(APP_SIGN_KEY)"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_RSA_2048), \
- echo "CONFIG_ESP_USE_MBEDTLS=y"; \
- echo "CONFIG_ESP_SIGN_RSA=y"; \
- echo "CONFIG_ESP_SIGN_RSA_LEN=2048"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_RSA_3072), \
- echo "CONFIG_ESP_USE_MBEDTLS=y"; \
- echo "CONFIG_ESP_SIGN_RSA=y"; \
- echo "CONFIG_ESP_SIGN_RSA_LEN=3072"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_ECDSA_P256), \
- echo "CONFIG_ESP_USE_TINYCRYPT=y"; \
- echo "CONFIG_ESP_SIGN_EC256=y"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_ED25519), \
- echo "CONFIG_ESP_USE_TINYCRYPT=y"; \
- echo "CONFIG_ESP_SIGN_ED25519=y"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_BOOT_ALLOW_ROM_BASIC), \
- echo "CONFIG_SECURE_BOOT_ALLOW_ROM_BASIC=y"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_BOOT_ALLOW_JTAG), \
- echo "CONFIG_SECURE_BOOT_ALLOW_JTAG=y"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_BOOT_ALLOW_EFUSE_RD_DIS), \
- echo "CONFIG_SECURE_BOOT_V2_ALLOW_EFUSE_RD_DIS=y"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_DISABLE_ROM_DL_MODE), \
- echo "CONFIG_SECURE_DISABLE_ROM_DL_MODE=y"; \
- ) \
- $(if $(CONFIG_ESP32_SECURE_INSECURE_ALLOW_DL_MODE), \
- echo "CONFIG_SECURE_INSECURE_ALLOW_DL_MODE=y"; \
- ) \
- echo "CONFIG_ESP_BOOTLOADER_SIZE=0xF000"; \
- echo "CONFIG_ESP_APPLICATION_PRIMARY_START_ADDRESS=$(CONFIG_ESP32_OTA_PRIMARY_SLOT_OFFSET)"; \
- echo "CONFIG_ESP_APPLICATION_SIZE=$(CONFIG_ESP32_OTA_SLOT_SIZE)"; \
- echo "CONFIG_ESP_APPLICATION_SECONDARY_START_ADDRESS=$(CONFIG_ESP32_OTA_SECONDARY_SLOT_OFFSET)";\
- echo "CONFIG_ESP_MCUBOOT_WDT_ENABLE=y"; \
- echo "CONFIG_ESP_SCRATCH_OFFSET=$(CONFIG_ESP32_OTA_SCRATCH_OFFSET)"; \
- echo "CONFIG_ESP_SCRATCH_SIZE=$(CONFIG_ESP32_OTA_SCRATCH_SIZE)"; \
+ $(Q) { \
+ $(if $(CONFIG_ESP32_SECURE_BOOT),$(call cfg_en,CONFIG_SECURE_BOOT)$(call cfg_en,CONFIG_SECURE_BOOT_V2_ENABLED)$(call cfg_val,CONFIG_ESP_SIGN_KEY_FILE,$(abspath $(TOPDIR)/$(ESPSEC_KEYDIR)/$(subst ",,$(CONFIG_ESP32_SECURE_BOOT_APP_SIGNING_KEY))))) \
+ $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_RSA_2048),$(call cfg_en,CONFIG_ESP_USE_MBEDTLS)$(call cfg_en,CONFIG_ESP_SIGN_RSA)$(call cfg_val,CONFIG_ESP_SIGN_RSA_LEN,2048)) \
+ $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_RSA_3072),$(call cfg_en,CONFIG_ESP_USE_MBEDTLS)$(call cfg_en,CONFIG_ESP_SIGN_RSA)$(call cfg_val,CONFIG_ESP_SIGN_RSA_LEN,3072)) \
+ $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_ECDSA_P256),$(call cfg_en,CONFIG_ESP_USE_TINYCRYPT)$(call cfg_en,CONFIG_ESP_SIGN_EC256)) \
+ $(if $(CONFIG_ESP32_SECURE_SIGNED_APPS_SCHEME_ED25519),$(call cfg_en,CONFIG_ESP_USE_TINYCRYPT)$(call cfg_en,CONFIG_ESP_SIGN_ED25519)) \
+ $(if $(CONFIG_ESP32_SECURE_BOOT_ALLOW_ROM_BASIC),$(call cfg_en,CONFIG_SECURE_BOOT_ALLOW_ROM_BASIC)) \
+ $(if $(CONFIG_ESP32_SECURE_BOOT_ALLOW_JTAG),$(call cfg_en,CONFIG_SECURE_BOOT_ALLOW_JTAG)) \
+ $(if $(CONFIG_ESP32_SECURE_BOOT_ALLOW_EFUSE_RD_DIS),$(call cfg_en,CONFIG_SECURE_BOOT_V2_ALLOW_EFUSE_RD_DIS)) \
+ $(if $(CONFIG_ESP32_SECURE_DISABLE_ROM_DL_MODE),$(call cfg_en,CONFIG_SECURE_DISABLE_ROM_DL_MODE)) \
+ $(if $(CONFIG_ESP32_SECURE_INSECURE_ALLOW_DL_MODE),$(call cfg_en,CONFIG_SECURE_INSECURE_ALLOW_DL_MODE)) \
+ $(call cfg_val,CONFIG_ESP_BOOTLOADER_SIZE,0xF000) \
+ $(call cfg_val,CONFIG_ESP_APPLICATION_PRIMARY_START_ADDRESS,$(CONFIG_ESP32_OTA_PRIMARY_SLOT_OFFSET)) \
+ $(call cfg_val,CONFIG_ESP_APPLICATION_SIZE,$(CONFIG_ESP32_OTA_SLOT_SIZE)) \
+ $(call cfg_val,CONFIG_ESP_APPLICATION_SECONDARY_START_ADDRESS,$(CONFIG_ESP32_OTA_SECONDARY_SLOT_OFFSET)) \
+ $(call cfg_en,CONFIG_ESP_MCUBOOT_WDT_ENABLE) \
+ $(call cfg_val,CONFIG_ESP_SCRATCH_OFFSET,$(CONFIG_ESP32_OTA_SCRATCH_OFFSET)) \
+ $(call cfg_val,CONFIG_ESP_SCRATCH_SIZE,$(CONFIG_ESP32_OTA_SCRATCH_SIZE)) \
} >> $(BOOTLOADER_CONFIG)
else ifeq ($(CONFIG_ESP32_APP_FORMAT_LEGACY),y)
- $(Q) { \
- echo "CONFIG_PARTITION_TABLE_CUSTOM=y"; \
- echo "CONFIG_PARTITION_TABLE_CUSTOM_FILENAME=\"partitions.csv\""; \
- echo "CONFIG_PARTITION_TABLE_OFFSET=$(CONFIG_ESP32_PARTITION_TABLE_OFFSET)"; \
+ $(Q) { \
+ $(call cfg_en,CONFIG_PARTITION_TABLE_CUSTOM) \
+ $(call cfg_val,CONFIG_PARTITION_TABLE_CUSTOM_FILENAME,\"partitions.csv\") \
+ $(call cfg_val,CONFIG_PARTITION_TABLE_OFFSET,$(CONFIG_ESP32_PARTITION_TABLE_OFFSET)) \
} >> $(BOOTLOADER_CONFIG)
endif
@@ -156,24 +131,24 @@ endif
endif
clean_bootloader:
- $(call DELDIR, $(BOOTLOADER_SRCDIR))
- $(call DELFILE, $(BOOTLOADER_CONFIG))
- $(call DELFILE, $(BOOTLOADER_BIN))
- $(if $(CONFIG_ESP32_SECURE_BOOT_BUILD_SIGNED_BINARIES), $(call DELFILE, $(BOOTLOADER_SIGNED_BIN)))
+ $(call DELDIR,$(BOOTLOADER_SRCDIR))
+ $(call DELFILE,$(BOOTLOADER_CONFIG))
+ $(call DELFILE,$(BOOTLOADER_BIN))
+ $(if $(CONFIG_ESP32_SECURE_BOOT_BUILD_SIGNED_BINARIES),$(call DELFILE,$(BOOTLOADER_SIGNED_BIN)))
else ifeq ($(CONFIG_ESP32_APP_FORMAT_LEGACY),y)
bootloader: $(BOOTLOADER_SRCDIR) $(BOOTLOADER_CONFIG)
$(Q) echo "Building Bootloader binaries"
$(Q) $(BOOTLOADER_SRCDIR)/build_idfboot.sh -c esp32 -s -f $(BOOTLOADER_CONFIG)
- $(call COPYFILE, $(BOOTLOADER_SRCDIR)/$(BOOTLOADER_OUTDIR)/bootloader-esp32.bin, $(TOPDIR))
- $(call COPYFILE, $(BOOTLOADER_SRCDIR)/$(BOOTLOADER_OUTDIR)/partition-table-esp32.bin, $(TOPDIR))
+ $(call COPYFILE,$(BOOTLOADER_SRCDIR)/$(BOOTLOADER_OUTDIR)/bootloader-esp32.bin,$(TOPDIR))
+ $(call COPYFILE,$(BOOTLOADER_SRCDIR)/$(BOOTLOADER_OUTDIR)/partition-table-esp32.bin,$(TOPDIR))
clean_bootloader:
- $(call DELDIR, $(BOOTLOADER_SRCDIR))
- $(call DELFILE, $(BOOTLOADER_CONFIG))
- $(call DELFILE, $(TOPDIR)/bootloader-esp32.bin)
- $(call DELFILE, $(TOPDIR)/partition-table-esp32.bin)
+ $(call DELDIR,$(BOOTLOADER_SRCDIR))
+ $(call DELFILE,$(BOOTLOADER_CONFIG))
+ $(call DELFILE,$(TOPDIR)/bootloader-esp32.bin)
+ $(call DELFILE,$(TOPDIR)/partition-table-esp32.bin)
endif
@@ -189,7 +164,7 @@ bootloader:
$(Q) curl -L $(BOOTLOADER_URL)/mcuboot-esp32.bin -o $(TOPDIR)/mcuboot-esp32.bin
clean_bootloader:
- $(call DELFILE, $(TOPDIR)/mcuboot-esp32.bin)
+ $(call DELFILE,$(TOPDIR)/mcuboot-esp32.bin)
else ifeq ($(CONFIG_ESP32_APP_FORMAT_LEGACY),y)
@@ -199,8 +174,8 @@ bootloader:
$(Q) curl -L $(BOOTLOADER_URL)/partition-table-esp32.bin -o $(TOPDIR)/partition-table-esp32.bin
clean_bootloader:
- $(call DELFILE, $(TOPDIR)/bootloader-esp32.bin)
- $(call DELFILE, $(TOPDIR)/partition-table-esp32.bin)
+ $(call DELFILE,$(TOPDIR)/bootloader-esp32.bin)
+ $(call DELFILE,$(TOPDIR)/partition-table-esp32.bin)
endif
diff --git a/tools/esp32/Config.mk b/tools/esp32/Config.mk
index 01fee0b..90570cf 100644
--- a/tools/esp32/Config.mk
+++ b/tools/esp32/Config.mk
@@ -119,6 +119,24 @@ YELLOW = \033[1;33m
BOLD = \033[1m
RST = \033[0m
+# Functions for printing help messages
+
+define HELP_SIGN_APP
+ $(Q) echo ""
+ $(Q) echo "$(YELLOW)Application not signed. Sign the application before flashing.$(RST)"
+ $(Q) echo "To sign the application, you can use this command:"
+ $(Q) echo " imgtool sign -k $(ESPSEC_KEYDIR)/$(CONFIG_ESP32_SECURE_BOOT_APP_SIGNING_KEY) --public-key-format hash --pad $(VERIFIED) --align 4 -v 0 -s auto -H $(CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE) --pad-header -S $(CONFIG_ESP32_OTA_SLOT_SIZE) nuttx.hex nuttx.signed.bin"
+ $(Q) echo ""
+endef
+
+define HELP_FLASH_BOOTLOADER
+ $(Q) echo ""
+ $(Q) echo "$(YELLOW)Secure boot enabled, so bootloader not flashed automatically.$(RST)"
+ $(Q) echo "Use the following command to flash the bootloader:"
+ $(Q) echo " esptool.py $(ESPTOOL_OPTS) write_flash $(ESPTOOL_WRITEFLASH_OPTS) $(FLASH_BL)"
+ $(Q) echo ""
+endef
+
# MERGEBIN -- Merge raw binary files into a single file
define MERGEBIN
@@ -149,7 +167,6 @@ endef
# SIGNBIN -- Create the signed binary image file for Secure Boot
-ifeq ($(CONFIG_ESP32_APP_FORMAT_MCUBOOT),y)
define SIGNBIN
$(Q) echo "SIGNBIN: ESP32 signed binary"
$(Q) if ! imgtool version 1>/dev/null 2>&1; then \
@@ -184,12 +201,16 @@ define SIGNBIN
$(Q) echo nuttx.signed.bin >> nuttx.manifest
$(Q) echo "Generated: nuttx.signed.bin (MCUboot compatible)"
endef
-endif
-# ELF2IMAGE -- Convert an ELF file into a compatible binary file
+# MKIMAGE -- Convert an ELF file into a compatible binary file
+ifeq ($(CONFIG_ESP32_SECURE_BOOT),y)
+define MKIMAGE
+ $(if $(CONFIG_ESP32_SECURE_BOOT_BUILD_SIGNED_BINARIES),$(call SIGNBIN),$(call HELP_SIGN_APP))
+endef
+else
ifeq ($(CONFIG_ESP32_APP_FORMAT_LEGACY),y)
-define ELF2IMAGE
+define MKIMAGE
$(Q) echo "MKIMAGE: ESP32 binary"
$(Q) if ! esptool.py version 1>/dev/null 2>&1; then \
echo ""; \
@@ -205,14 +226,14 @@ define ELF2IMAGE
esptool.py -c esp32 elf2image $(ESPTOOL_FLASH_OPTS) -o nuttx.bin nuttx
$(Q) echo "Generated: nuttx.bin (ESP32 compatible)"
endef
-else
-define ELF2IMAGE
+else ifeq ($(CONFIG_ESP32_APP_FORMAT_MCUBOOT),y)
+define MKIMAGE
$(Q) echo "MKIMAGE: ESP32 binary"
$(Q) if ! imgtool version 1>/dev/null 2>&1; then \
echo ""; \
echo "imgtool not found. Please run: \"pip install imgtool\""; \
echo ""; \
- echo "Run make again to create the nuttx.signed.bin image."; \
+ echo "Run make again to create the nuttx.bin image."; \
exit 1; \
fi
imgtool sign --pad $(VERIFIED) --align 4 -v 0 -s auto \
@@ -222,42 +243,14 @@ define ELF2IMAGE
$(Q) echo "Generated: nuttx.bin (MCUboot compatible)"
endef
endif
-
-define HELP_SIGN_APP
- $(Q) echo ""
- $(Q) echo "$(YELLOW)Application not signed. Sign the application before flashing.$(RST)"
- $(Q) echo "To sign the application, you can use this command:"
- $(Q) echo " imgtool sign -k $(ESPSEC_KEYDIR)/$(CONFIG_ESP32_SECURE_BOOT_APP_SIGNING_KEY) --public-key-format hash --pad $(VERIFIED) --align 4 -v 0 -s auto -H $(CONFIG_ESP32_APP_MCUBOOT_HEADER_SIZE) --pad-header -S $(CONFIG_ESP32_OTA_SLOT_SIZE) nuttx.hex nuttx.signed.bin"
- $(Q) echo ""
-endef
-
-define HELP_FLASH_BOOTLOADER
- $(Q) echo ""
- $(Q) echo "$(YELLOW)Secure boot enabled, so bootloader not flashed automatically.$(RST)"
- $(Q) echo "Use the following command to flash the bootloader:"
- $(Q) echo " esptool.py $(ESPTOOL_OPTS) write_flash $(ESPTOOL_WRITEFLASH_OPTS) $(FLASH_BL)"
- $(Q) echo ""
-endef
+endif
# POSTBUILD -- Perform post build operations
-ifeq ($(CONFIG_ESP32_APP_FORMAT_MCUBOOT),y)
define POSTBUILD
- $(if $(CONFIG_ESP32_SECURE_BOOT), \
- $(if $(CONFIG_ESP32_SECURE_BOOT_BUILD_SIGNED_BINARIES), \
- $(call SIGNBIN), \
- $(call HELP_SIGN_APP) \
- ), \
- $(call ELF2IMAGE) \
- )
+ $(call MKIMAGE)
$(if $(CONFIG_ESP32_MERGE_BINS),$(call MERGEBIN))
endef
-else ifeq ($(CONFIG_ESP32_APP_FORMAT_LEGACY),y)
-define POSTBUILD
- $(call ELF2IMAGE)
- $(if $(CONFIG_ESP32_MERGE_BINS),$(call MERGEBIN))
-endef
-endif
# ESPTOOL_BAUD -- Serial port baud rate used when flashing/reading via esptool.py