From 234f1a60cf689ec4f4c613248d3c44cdb44fdaee Mon Sep 17 00:00:00 2001
From: Ezra Maccabee <von.akimov@gmail.com>
Date: Fri, 3 Jul 2026 17:19:16 +0300
Subject: [PATCH] # Phase 4: connection loss handling with spsdk

---
 tools/production/app/TFT_BOOTLOADER_OLD.bin   | Bin 0 -> 47432 bytes
 tools/production/app/flash_backend.py         | 192 +++++++++++++-----
 tools/production/app/flasher.py               |  68 +++++--
 tools/production/app/models.py                |   3 +-
 tools/production/app/screens/flash.py         |   5 +-
 .../firmware_test_hab.bin                     | Bin
 tools/production/spike/spike_readback.py      |  70 +++++++
 tools/production/tests/test_flash_backend.py  |  25 +++
 8 files changed, 301 insertions(+), 62 deletions(-)
 create mode 100644 tools/production/app/TFT_BOOTLOADER_OLD.bin
 rename tools/production/{app => custom_binaries}/firmware_test_hab.bin (100%)
 create mode 100644 tools/production/spike/spike_readback.py

diff --git a/tools/production/app/TFT_BOOTLOADER_OLD.bin b/tools/production/app/TFT_BOOTLOADER_OLD.bin
new file mode 100644
index 0000000000000000000000000000000000000000..f5a469290f8312405ba9678b4fc812dd15610daf
GIT binary patch
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HcmV?d00001

diff --git a/tools/production/app/flash_backend.py b/tools/production/app/flash_backend.py
index d527d8b..99c9047 100644
--- a/tools/production/app/flash_backend.py
+++ b/tools/production/app/flash_backend.py
@@ -9,12 +9,18 @@ Zero Textual/asyncio импортов — модуль полностью син
 без event loop (см. test_flash_backend.py). Async-обвязка (asyncio.to_thread
 + run_coroutine_threadsafe) — забота Flasher (Фаза 2), не этого модуля.
 
-Открытые вопросы/допущения (см. сопроводительное сообщение в чате):
+Открытые вопросы/допущения:
   - Одна сессия McuBoot на весь flash()/erase_chip(), а не переоткрытие
     на каждую операцию, как в CLI flash_usb.py.
   - Имена FlashProgress.phase свои (не парсинг stdout blhost).
-  - Иерархия исключений — предложение автора модуля, не зафиксирована
-    отдельно в MONOLITH_APP_PLAN.md.
+
+Фаза 4: SPSDKConnectionError оборачивается в ConnectionLostError на всех
+трёх точках отказа (SDP write, McuBoot handshake+команды, McuBoot chip erase),
+что позволяет Flasher/TUI отличить обрыв USB от логической ошибки через
+поле connection_lost. USB-интерфейс, полученный из load_flashloader(),
+закрывается в finally на любом исходе (защита от утечки HID-хэндла в
+редком окне «wait_for_flashloader вернул интерфейс → USB выдернут →
+McuBoot.__enter__ упал»).
 """
 
 from __future__ import annotations
@@ -22,11 +28,13 @@ from __future__ import annotations
 import hashlib
 import logging
 import os
+import sys
 import tempfile
 import time
 from pathlib import Path
 from typing import Callable, Optional
 
+from spsdk.exceptions import SPSDKConnectionError
 from spsdk.image.hab.hab_image import HabImage
 from spsdk.mboot import McuBoot, MbootUSBInterface
 from spsdk.sdp import SDP, SdpUSBInterface
@@ -52,6 +60,15 @@ def fcb_blob_path(fcb_filename: str) -> Path:
     return _HOST_DCD_DIR / fcb_filename
 
 
+def firmware_hab_path(firmware: str, build_type: str) -> Path:
+    """Путь к готовому HAB-образу штатной прошивки (Р6, двухрежимный резолв)."""
+    if getattr(sys, "frozen", False):
+        base = Path(sys.executable).resolve().parent / "firmware"
+    else:
+        base = Path(os.environ.get("BUILD_DIR", str(REPO_ROOT / "build")))
+    return base / build_type / f"{firmware}_hab.bin"
+
+
 # ─── USB VID:PID (те же переменные окружения, что уже приняты в проекте) ──
 
 _BOOTROM_VID = int(os.environ.get("BOOTROM_VID", "0x1fc9"), 16)
@@ -92,7 +109,38 @@ _HAB_OPTIONS_TEMPLATE = [
 
 
 class FlashBackendError(Exception):
-    """Базовая ошибка flash_backend."""
+    """Базовая ошибка flash_backend.
+
+    :cvar connection_lost: True если ошибка связана с потерей физического
+        соединения (USB выдернут, устройство пропало с шины). Позволяет
+        Flasher/TUI отличить обрыв от логической ошибки без парсинга
+        текста сообщения. По умолчанию False; подкласс ConnectionLostError
+        переопределяет на True.
+    """
+
+    connection_lost: bool = False
+
+    def __init__(self, message: str, *, connection_lost: bool = False) -> None:
+        super().__init__(message)
+        # instance-level override — на случай, если базовый класс поднимается
+        # напрямую с connection_lost=True без использования ConnectionLostError
+        if connection_lost:
+            self.connection_lost = True
+
+
+class ConnectionLostError(FlashBackendError):
+    """Потеря USB-соединения посреди операции (обёртка над SPSDKConnectionError).
+
+    Обёртка над spsdk.exceptions.SPSDKConnectionError, поднимается при
+    исчезновении устройства с шины во время выполнения SDP/McuBoot команд.
+    Отличается от DeviceNotFoundError, который возникает ДО начала операции
+    (устройство никогда не было подключено).
+    """
+
+    connection_lost: bool = True
+
+    def __init__(self, message: str) -> None:
+        super().__init__(message, connection_lost=True)
 
 
 class DeviceNotFoundError(FlashBackendError):
@@ -127,6 +175,21 @@ def _emit(
         progress_cb(FlashProgress(phase=phase, percent=percent, message=message))
 
 
+def _close_iface_quiet(iface: MbootUSBInterface) -> None:
+    """Закрыть интерфейс в finally, глотая любые ошибки.
+
+    Внутри McuBoot() как context-manager закрытие уже происходит, поэтому
+    повторное close() на закрытом интерфейсе может выкинуть исключение
+    из libusbsio — нам это не важно, мы просто хотим гарантию, что если
+    McuBoot.__enter__ упал (окно между load_flashloader и with McuBoot()),
+    интерфейс не остался висеть с открытым HID-хэндлом.
+    """
+    try:
+        iface.close()
+    except Exception:
+        pass
+
+
 # ─── Flashloader bring-up ───────────────────────────────────────────────────
 
 
@@ -155,6 +218,7 @@ def load_flashloader(
 
     :raises DeviceNotFoundError: SDP-устройство не найдено (и Flashloader тоже не поднят).
     :raises FlashLoaderTimeoutError: см. wait_for_flashloader().
+    :raises ConnectionLostError: USB-соединение потеряно во время SDP-обмена.
     """
     already = MbootUSBInterface.scan(device_id=_FLASHLOADER_DEVICE_ID)
     if already:
@@ -176,9 +240,14 @@ def load_flashloader(
         f"Загрузка Flashloader через SDP ({_SDP_DEVICE_ID})",
     )
     data = FLASHLOADER_BIN.read_bytes()
-    with SDP(sdp_devices[0]) as sdp:
-        sdp.write_file(FLASHLOADER_LOAD_ADDR, data)
-        sdp.jump_and_run(FLASHLOADER_LOAD_ADDR)
+    try:
+        with SDP(sdp_devices[0]) as sdp:
+            sdp.write_file(FLASHLOADER_LOAD_ADDR, data)
+            sdp.jump_and_run(FLASHLOADER_LOAD_ADDR)
+    except SPSDKConnectionError as exc:
+        raise ConnectionLostError(
+            f"USB-соединение потеряно при загрузке Flashloader: {exc}"
+        ) from exc
 
     iface = wait_for_flashloader()
     _emit(progress_cb, "load_flashloader", 100, "Flashloader готов")
@@ -239,6 +308,7 @@ def flash(
     :param fcb_path: Явный FCB-блоб (custom-бинари). None → auto-config
                       (write_fcb_auto, только для штатных firmware_test/production).
     :raises FlashBackendError: и подклассы — на любой ошибке.
+    :raises ConnectionLostError: обрыв USB посреди операции.
     """
     if not hab_bin.exists():
         raise FlashBackendError(f"Файл не найден: {hab_bin}")
@@ -249,9 +319,14 @@ def flash(
         if not sdp_devices:
             raise DeviceNotFoundError(f"SDP-устройство не найдено ({_SDP_DEVICE_ID})")
         addr = FLASH_BASE + HAB_OFFSET
-        with SDP(sdp_devices[0]) as sdp:
-            sdp.write_file(addr, hab_bin.read_bytes())
-            sdp.jump_and_run(addr)
+        try:
+            with SDP(sdp_devices[0]) as sdp:
+                sdp.write_file(addr, hab_bin.read_bytes())
+                sdp.jump_and_run(addr)
+        except SPSDKConnectionError as exc:
+            raise ConnectionLostError(
+                f"USB-соединение потеряно при RAM-загрузке: {exc}"
+            ) from exc
         _emit(progress_cb, "done", 100, "Загружено в RAM")
         return
 
@@ -261,59 +336,82 @@ def flash(
     hab_size = hab_bin.stat().st_size
     erase_size = ((HAB_OFFSET + hab_size + 0xFFF) // 0x1000) * 0x1000
 
-    with McuBoot(iface) as mboot:
-        _emit(progress_cb, "configure", 0, "Конфигурация FlexSPI NOR")
-        configure_flexspi(mboot)
+    # try/finally гарантирует закрытие iface даже если McuBoot.__enter__ падает
+    # ДО того, как SDP context-manager отработает (тонкое окно, но реальное:
+    # wait_for_flashloader вернул интерфейс, USB выдернут до McuBoot handshake).
+    try:
+        with McuBoot(iface) as mboot:
+            _emit(progress_cb, "configure", 0, "Конфигурация FlexSPI NOR")
+            configure_flexspi(mboot)
 
-        _emit(
-            progress_cb, "erase", 0, f"Стирание 0x{FLASH_BASE:08X} + {erase_size} байт"
-        )
-        ok = mboot.flash_erase_region(FLASH_BASE, erase_size, mem_id=0)
-        if not ok:
-            raise FlashBackendError("flash_erase_region вернул False")
+            _emit(
+                progress_cb,
+                "erase",
+                0,
+                f"Стирание 0x{FLASH_BASE:08X} + {erase_size} байт",
+            )
+            ok = mboot.flash_erase_region(FLASH_BASE, erase_size, mem_id=0)
+            if not ok:
+                raise FlashBackendError("flash_erase_region вернул False")
 
-        _emit(progress_cb, "fcb", 0, "Запись FCB")
-        if fcb_path is not None:
-            write_fcb_explicit(mboot, fcb_path)
-        else:
-            write_fcb_auto(mboot)
+            _emit(progress_cb, "fcb", 0, "Запись FCB")
+            if fcb_path is not None:
+                write_fcb_explicit(mboot, fcb_path)
+            else:
+                write_fcb_auto(mboot)
 
-        _emit(progress_cb, "write", 0, f"Запись {hab_bin.name} ({hab_size} байт)")
+            _emit(progress_cb, "write", 0, f"Запись {hab_bin.name} ({hab_size} байт)")
 
-        def _on_progress(current: int, total: int) -> None:
-            percent = int(current * 100 / total) if total else 0
-            _emit(progress_cb, "write", percent, f"{current}/{total} байт")
+            def _on_progress(current: int, total: int) -> None:
+                percent = int(current * 100 / total) if total else 0
+                _emit(progress_cb, "write", percent, f"{current}/{total} байт")
 
-        data = hab_bin.read_bytes()
-        ok = mboot.write_memory(
-            write_addr, data, mem_id=0, progress_callback=_on_progress
-        )
-        if not ok:
-            raise FlashBackendError("write_memory (HAB-образ) вернул False")
+            data = hab_bin.read_bytes()
+            ok = mboot.write_memory(
+                write_addr, data, mem_id=0, progress_callback=_on_progress
+            )
+            if not ok:
+                raise FlashBackendError("write_memory (HAB-образ) вернул False")
 
-        _emit(progress_cb, "reset", 0, "Reset")
-        mboot.reset(reopen=False)
+            _emit(progress_cb, "reset", 0, "Reset")
+            mboot.reset(reopen=False)
+    except SPSDKConnectionError as exc:
+        raise ConnectionLostError(
+            f"USB-соединение потеряно во время прошивки: {exc}"
+        ) from exc
+    finally:
+        _close_iface_quiet(iface)
 
     _emit(progress_cb, "done", 100, "Прошивка завершена успешно")
 
 
 def erase_chip(progress_cb: Optional[ProgressCallback] = None) -> None:
     """Полная очистка Flash (см. flash_usb.py::erase_chip). После erase FCB
-    тоже стёрт — плата не загрузится до следующей прошивки."""
+    тоже стёрт — плата не загрузится до следующей прошивки.
+
+    :raises ConnectionLostError: обрыв USB посреди chip erase.
+    """
     iface = load_flashloader(progress_cb)
 
-    with McuBoot(iface) as mboot:
-        _emit(progress_cb, "configure", 0, "Конфигурация FlexSPI NOR")
-        configure_flexspi(mboot)
+    try:
+        with McuBoot(iface) as mboot:
+            _emit(progress_cb, "configure", 0, "Конфигурация FlexSPI NOR")
+            configure_flexspi(mboot)
 
-        _emit(progress_cb, "erase", 0, "Полная очистка Flash (~30с)")
-        iface.device.timeout = ERASE_ALL_TIMEOUT_MS  # см. Фазу 0, ⚠В2
-        ok = mboot.flash_erase_all(mem_id=FLEXSPI_MEMORY_ID)
-        if not ok:
-            raise FlashBackendError("flash_erase_all вернул False")
+            _emit(progress_cb, "erase", 0, "Полная очистка Flash (~30с)")
+            iface.device.timeout = ERASE_ALL_TIMEOUT_MS  # см. Фазу 0, ⚠В2
+            ok = mboot.flash_erase_all(mem_id=FLEXSPI_MEMORY_ID)
+            if not ok:
+                raise FlashBackendError("flash_erase_all вернул False")
 
-        _emit(progress_cb, "reset", 0, "Reset")
-        mboot.reset(reopen=False)
+            _emit(progress_cb, "reset", 0, "Reset")
+            mboot.reset(reopen=False)
+    except SPSDKConnectionError as exc:
+        raise ConnectionLostError(
+            f"USB-соединение потеряно во время chip erase: {exc}"
+        ) from exc
+    finally:
+        _close_iface_quiet(iface)
 
     _emit(progress_cb, "done", 100, "Chip erase завершён")
 
diff --git a/tools/production/app/flasher.py b/tools/production/app/flasher.py
index 879d539..060cb50 100644
--- a/tools/production/app/flasher.py
+++ b/tools/production/app/flasher.py
@@ -48,16 +48,10 @@ logger = logging.getLogger(__name__)
 # Release временно нестабилен (см. отчёт о тестировании) — по умолчанию Debug.
 _FIRMWARE_BUILD_TYPE = os.environ.get("FIRMWARE_BUILD_TYPE", "Debug")
 
-# tools/host/build (или переопределено через BUILD_DIR) — та же логика,
-# что раньше жила внутри flash_usb.py::main() и была ему видна только
-# через CLI-аргументы --firmware/--build-type. Теперь резолвим сами.
-_BUILD_DIR = Path(os.environ.get("BUILD_DIR", str(flash_backend.REPO_ROOT / "build")))
-
 
 def _firmware_hab_path(firmware: str) -> Path:
-    """Путь к готовому HAB-образу штатной прошивки (см. build.just — тот же
-    файл, что собирает `nxpimage hab export` при обычной сборке)."""
-    return _BUILD_DIR / _FIRMWARE_BUILD_TYPE / f"{firmware}_hab.bin"
+    """Делегирование в backend (Р6): dev/frozen резолв живёт там."""
+    return flash_backend.firmware_hab_path(firmware, _FIRMWARE_BUILD_TYPE)
 
 
 def _resolve_custom_binaries_dir() -> Path:
@@ -111,6 +105,20 @@ def _make_sync_progress_cb(
     return _sync_cb
 
 
+def _format_error_message(exc: BaseException) -> str:
+    """Человекочитаемое сообщение для FlashProgress(phase="error").
+
+    Для ConnectionLostError (и любого FlashBackendError с connection_lost=True)
+    добавляет явный префикс — вариант А (согласовано): специального перехода
+    экрана нет, но в #flash-log причина должна читаться однозначно, без
+    необходимости лезть в общий лог-файл за трейсбеком.
+    """
+    connection_lost = getattr(exc, "connection_lost", False)
+    if connection_lost:
+        return f"Соединение с платой потеряно: {exc}"
+    return str(exc)
+
+
 class Flasher:
     """
     Async-обёртка над app/flash_backend.py.
@@ -154,9 +162,17 @@ class Flasher:
     ) -> bool:
         """Выполнить flash_backend.flash()/erase_chip() в потоке.
 
-        flash_backend поднимает FlashBackendError вместо возврата False —
-        здесь это конвертируется обратно в контракт Flasher (bool + событие
-        phase="error"), который был у subprocess-версии (ненулевой returncode).
+        flash_backend поднимает FlashBackendError (включая ConnectionLostError,
+        см. Фазу 4) вместо возврата False — здесь это конвертируется обратно
+        в контракт Flasher (bool + событие phase="error"), который был у
+        subprocess-версии (ненулевой returncode).
+
+        Отдельный except Exception — safety net (Фаза 4, согласовано):
+        любое непредвиденное исключение из worker-потока (не только
+        FlashBackendError) обязано вернуть управление в TUI с ok=False,
+        а не оставить кнопки заблокированными навсегда. KeyboardInterrupt/
+        SystemExit/CancelledError не перехватываются — это BaseException,
+        не Exception, пробрасываются как есть
         """
         try:
             await asyncio.to_thread(func, *args, progress_cb=sync_progress_cb, **kwargs)
@@ -165,7 +181,22 @@ class Flasher:
             logger.error("%s: %s", getattr(func, "__name__", func), exc)
             if async_progress_cb is not None:
                 await async_progress_cb(
-                    FlashProgress(phase="error", percent=0, message=str(exc))
+                    FlashProgress(
+                        phase="error", percent=0, message=_format_error_message(exc)
+                    )
+                )
+            return False
+        except Exception as exc:  # noqa: BLE001 — safety net, см. docstring
+            logger.exception(
+                "%s: непредвиденная ошибка", getattr(func, "__name__", func)
+            )
+            if async_progress_cb is not None:
+                await async_progress_cb(
+                    FlashProgress(
+                        phase="error",
+                        percent=0,
+                        message=f"Непредвиденная ошибка: {exc}",
+                    )
                 )
             return False
 
@@ -319,7 +350,18 @@ class Flasher:
                     FlashProgress(
                         phase="error",
                         percent=0,
-                        message=f"Ошибка сборки HAB-образа: {exc}",
+                        message=f"Ошибка сборки HAB-образа: {_format_error_message(exc)}",
+                    )
+                )
+            return None
+        except Exception as exc:  # noqa: BLE001 — safety net, см. _run_flash_op
+            logger.exception("build_custom_hab: непредвиденная ошибка")
+            if progress_cb is not None:
+                await progress_cb(
+                    FlashProgress(
+                        phase="error",
+                        percent=0,
+                        message=f"Непредвиденная ошибка сборки HAB-образа: {exc}",
                     )
                 )
             return None
diff --git a/tools/production/app/models.py b/tools/production/app/models.py
index cdf4a60..48d0757 100644
--- a/tools/production/app/models.py
+++ b/tools/production/app/models.py
@@ -131,6 +131,7 @@ class ConfirmRequest:
 class FlashProgress:
     """Прогресс прошивки."""
 
-    phase: str  # "sdphost" | "blhost" | "done" | "error"
+    phase: str  # "load_flashloader" | "configure" | "erase" | "fcb" | "write"
+    # | "reset" | "hab_build" | "done" | "error"
     percent: int  # 0..100
     message: str
diff --git a/tools/production/app/screens/flash.py b/tools/production/app/screens/flash.py
index 9ba872b..efa2270 100644
--- a/tools/production/app/screens/flash.py
+++ b/tools/production/app/screens/flash.py
@@ -49,7 +49,8 @@ class FlashScreen(Screen, ConnectionWatcherMixin):
     Если плата физически отключена в простое — сессия считается
     недостоверной, экран сразу уходит на WaitingScreen (см. замечание
     №4 отчёта). Во время самой прошивки/erase мониторинг приостановлен —
-    обрыв в этом случае обнаружит и обработает сам flash_usb.py subprocess.
+    обрыв в этом случае обнаруживает сам flash_backend (SPSDKConnectionError
+    → ConnectionLostError, см. Фазу 4) и репортит через #flash-log.
     """
 
     BINDINGS = [
@@ -154,6 +155,8 @@ class FlashScreen(Screen, ConnectionWatcherMixin):
     def _check_sdp_present(self) -> bool:
         # Не считаем потерей соединения, если идёт активная операция —
         # flash_usb.py сам обработает реальный обрыв через subprocess.
+        # обрыв в этом случае обнаружит и обработает сам flash_backend
+        # (ConnectionLostError, см. Фазу 4), не watcher.
         if self._flashing:
             return True
         return Flasher.detect_sdp()
diff --git a/tools/production/app/firmware_test_hab.bin b/tools/production/custom_binaries/firmware_test_hab.bin
similarity index 100%
rename from tools/production/app/firmware_test_hab.bin
rename to tools/production/custom_binaries/firmware_test_hab.bin
diff --git a/tools/production/spike/spike_readback.py b/tools/production/spike/spike_readback.py
new file mode 100644
index 0000000..1c8133d
--- /dev/null
+++ b/tools/production/spike/spike_readback.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""
+spike_readback.py — диагностика Гейта 3: читает Flash обратно и сравнивает
+с ожидаемыми файлами (FCB-блоб @0x60000000, HAB-образ @0x60001000).
+
+Запуск (плата в SDP или с уже поднятым Flashloader):
+    uv run python spike/spike_readback.py \
+        --expect-fcb ../host/dcd/w25q128_fdcb.bin \
+        --expect-image /путь/к/собранному.hab.bin
+Дампы кладёт рядом: readback_fcb.bin, readback_image.bin.
+"""
+
+from __future__ import annotations
+
+import argparse
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+from app import flash_backend as fb  # noqa: E402
+from spsdk.mboot import McuBoot  # noqa: E402
+
+
+def _cmp(label: str, actual: bytes, expected: bytes) -> bool:
+    if actual == expected:
+        print(f"  {label}: ✅ ПОБАЙТНО СОВПАДАЕТ ({len(actual)} байт)")
+        return True
+    n = min(len(actual), len(expected))
+    diff_at = next((i for i in range(n) if actual[i] != expected[i]), n)
+    print(
+        f"  {label}: ❌ РАСХОЖДЕНИЕ с офсета 0x{diff_at:X} "
+        f"(len actual={len(actual)}, expected={len(expected)})"
+    )
+    print(f"    actual  [{diff_at:#x}]: {actual[diff_at : diff_at + 16].hex()}")
+    print(f"    expected[{diff_at:#x}]: {expected[diff_at : diff_at + 16].hex()}")
+    return False
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--expect-fcb", type=Path, required=True)
+    ap.add_argument("--expect-image", type=Path, required=True)
+    args = ap.parse_args()
+
+    exp_fcb = args.expect_fcb.read_bytes()
+    exp_img = args.expect_image.read_bytes()
+
+    iface = fb.load_flashloader(progress_cb=lambda p: print(f"  {p.message}"))
+    ok = True
+    with McuBoot(iface) as mboot:
+        fb.configure_flexspi(mboot)
+
+        fcb = mboot.read_memory(fb.FLASH_BASE, max(len(exp_fcb), 512), mem_id=0)
+        img = mboot.read_memory(fb.FLASH_BASE + fb.HAB_OFFSET, len(exp_img), mem_id=0)
+        if fcb is None or img is None:
+            print("❌ read_memory вернул None")
+            return 1
+
+        Path("readback_fcb.bin").write_bytes(fcb)
+        Path("readback_image.bin").write_bytes(img)
+
+        ok = _cmp("FCB   @0x60000000", fcb[: len(exp_fcb)], exp_fcb) and ok
+        ok = _cmp("Image @0x60001000", img, exp_img) and ok
+
+    return 0 if ok else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/tools/production/tests/test_flash_backend.py b/tools/production/tests/test_flash_backend.py
index 5021296..ef2677d 100644
--- a/tools/production/tests/test_flash_backend.py
+++ b/tools/production/tests/test_flash_backend.py
@@ -421,3 +421,28 @@ def test_build_custom_hab_bytes_match_golden(tmp_path):
     out1 = fb.build_custom_hab(raw, use_dcd=False)
     out2 = fb.build_custom_hab(raw, use_dcd=False)
     assert out1.read_bytes() == out2.read_bytes()
+
+
+# ─── firmware_hab_path() — двухрежимный резолв (Р6) ──────────────────────
+
+
+def test_firmware_hab_path_dev_default(monkeypatch):
+    monkeypatch.delenv("BUILD_DIR", raising=False)
+    p = fb.firmware_hab_path("firmware_test", "Debug")
+    assert p == fb.REPO_ROOT / "build" / "Debug" / "firmware_test_hab.bin"
+
+
+def test_firmware_hab_path_dev_env_override(monkeypatch, tmp_path):
+    monkeypatch.setenv("BUILD_DIR", str(tmp_path))
+    p = fb.firmware_hab_path("bootloader", "Release")
+    assert p == tmp_path / "Release" / "bootloader_hab.bin"
+
+
+def test_firmware_hab_path_frozen(monkeypatch, tmp_path):
+    exe = tmp_path / "dist" / "service_tui"
+    exe.parent.mkdir(parents=True)
+    exe.touch()
+    monkeypatch.setattr(fb.sys, "frozen", True, raising=False)
+    monkeypatch.setattr(fb.sys, "executable", str(exe))
+    p = fb.firmware_hab_path("firmware_test", "Debug")
+    assert p == exe.parent / "firmware" / "Debug" / "firmware_test_hab.bin"