I followed the instructions in the esp-idf for turning on code signing. After generating the keys, I get the following linking error:
------ Build started: Project: app-template, Configuration: Debug VisualGDB ------
VisualGDB: Run "C:\PROGRA~2\Sysprogs\VISUAL~1/ninja.exe " in directory "D:\VS2\EmbeddedProject5\EmbeddedProject5/..\..\Git2\VoltageSensor\firmware/VisualGDB/Debug" on local computer
[1/6] Performing build step for 'bootloader'
[1/5] Generating ../../signature_verification_key.bin.S
[2/5] Building ASM object esp-idf/bootloader_support/CMakeFiles/__idf_bootloader_support.dir/__/__/signature_verification_key.bin.S.obj
[3/5] Linking C static library esp-idf\bootloader_support\libbootloader_support.a
[4/5] Linking C executable bootloader.elf
[5/5] Generating binary image from built executable
esptool.py v2.8-dev
Generated D:/VS2/Git2/VoltageSensor/firmware/VisualGDB/Debug/bootloader/bootloader.bin
[2/4] Linking CXX executable app-template.elf
FAILED: app-template.elf
cmd.exe /C "cd . && C:\sysgcc\esp32\opt\xtensa-esp32-elf\bin\xtensa-esp32-elf-g++.exe -mlongcalls -Wno-frame-address -g -nostdlib @CMakeFiles\app-template.elf.rsp -o app-template.elf && cd ."
c:/sysgcc/esp32/opt/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/bootloader_support/libbootloader_support.a(secure_boot_signatures.c.obj)(0): error : undefined reference to `_binary_signature_verification_key_bin_end'
c:/sysgcc/esp32/opt/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/bootloader_support/libbootloader_support.a(secure_boot_signatures.c.obj)(0): error : undefined reference to `_binary_signature_verification_key_bin_start'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
-------------------------------------------------------------
Command exited with code 1
Executable: C:\PROGRA~2\Sysprogs\VISUAL~1/ninja.exe
Arguments:
Directory: D:\VS2\EmbeddedProject5\EmbeddedProject5/..\..\Git2\VoltageSensor\firmware/VisualGDB/Debug
VisualGDB: Error: Command-line action failed
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
According to this, the signature_verification_key.bin.S file was generated, the object file was generated from that, but the linker can't find a reference to the binary data.
Anyone else seen this?
Image signing
Re: Image signing
Did you ever figure this out? I'm getting this too.
Re: Image signing
I found this link that says that it is incompatible with CMAKE, so I gave up:
https://esp32.com/viewtopic.php?t=9640
https://esp32.com/viewtopic.php?t=9640
Re: Image signing
Hi nick,
CMake is no longer a preview and this is supported on ESP-IDF v4.x.
However, I'm able to reproduce this problem. The verification key binary is being linked to the bootloader correctly but not the app. Will fix ASAP.
Angus
CMake is no longer a preview and this is supported on ESP-IDF v4.x.
However, I'm able to reproduce this problem. The verification key binary is being linked to the bootloader correctly but not the app. Will fix ASAP.
Angus
Re: Image signing
Just a quick update on this for anyone else struggling to find a solution. I created a support request for this issue:
https://github.com/espressif/esp-idf/issues/4419
There are some further clues on the linked thread. It seems to still be occurring on 3.3, but looks like there's a fix already within 4.1. Unfortunately we can't update beyond 3.3 since we're using Arduino-ESP32, so hoping there's a fix possible within 3.3. If anyone has any suggestions, please let me know, because getting secure signed builds is a critical feature for us.
https://github.com/espressif/esp-idf/issues/4419
There are some further clues on the linked thread. It seems to still be occurring on 3.3, but looks like there's a fix already within 4.1. Unfortunately we can't update beyond 3.3 since we're using Arduino-ESP32, so hoping there's a fix possible within 3.3. If anyone has any suggestions, please let me know, because getting secure signed builds is a critical feature for us.
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