loader: export zephyr version via USB descriptor and reflash loader is out-of-sync

boards.txt

@@ -46,6 +46,7 @@ giga.upload.vid=0x2341
 giga.upload.pid=0x0366
 giga.upload.interface=0
 giga.upload.use_1200bps_touch=true
+giga.upload.use_pre_upload_check=true
 giga.upload.wait_for_upload_port=true
 giga.upload.native_usb=true
 giga.upload.maximum_size=1966080

loader/CMakeLists.txt

@@ -37,6 +37,10 @@ target_sources_ifdef(CONFIG_USB_DEVICE_STACK_NEXT app PRIVATE
 
 FILE(GLOB app_sources *.c)
 target_sources(app PRIVATE ${app_sources})
-target_compile_definitions(app PUBLIC _XOPEN_SOURCE=700)
+
+zephyr_compile_definitions(
+  -D_XOPEN_SOURCE=700
+  -DCONFIG_USB_CONFIGURATION_STRING_DESC=STRINGIFY\(BUILD_VERSION\)
+)
 
 target_link_libraries(app PUBLIC blobs)

loader/prj.conf

@@ -49,3 +49,5 @@ CONFIG_RTC=y
 CONFIG_RTC_ALARM=y
 CONFIG_RTC_UPDATE=y
 CONFIG_RTC_CALIBRATION=y
+
+CONFIG_USB_CONFIGURATION_STRING_DESC_ENABLE=y

platform.txt

@@ -225,6 +225,10 @@ tools.stm32flash.erase.pattern="{path}/{cmd}" {serial.port} -e 1024 -b 2400
 # DFU_UTIL
 #
 
+tools.dfu-util.pre_cmd.linux={build.variant.path}/check_loader_version.sh
+tools.dfu-util.pre_upload_check.pattern="{pre_cmd}" {upload.port.properties.configuration}
+tools.dfu-util.pre_upload.pattern="{path}/{cmd}" --device ,{bootloader.vid}:{bootloader.pid} -D "{runtime.platform.path}/firmwares/{bootloader.file}" -a{bootloader.interface} --dfuse-address={bootloader.address}
+
 upload.dfuse=--dfuse-address={upload.address}:leave
 bootloader.dfuse=--dfuse-address={bootloader.address}:leave
 

variants/arduino_giga_r1_stm32h747xx_m7/check_loader_version.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+DIR=$(dirname "$(readlink -f "$0")")
+VERSION=$(grep "define BUILD_VERSION" ${DIR}/llext-edk/include/zephyr/include/generated/zephyr/version.h | cut -f3 -d " ")
+if [ "$VERSION" != "$1" ]; then
+    echo "Loader version mismatch: expected $1, got $VERSION, reflashing loader"
+    exit 1
+fi
+exit 0

west.yml

@@ -21,7 +21,7 @@ manifest:
   projects:
     - name: zephyr
       remote: arduino
-      revision: zephyr-arduino-v4.2.0
+      revision: zephyr-arduino-v4.2.0+iConfig
       import:
         name-allowlist:
           - cmsis