bugfix for reboot loop affecting V3 "legacy" builds

* ``-DCONFIG_LITTLEFS_FOR_IDF_3_2 -DLFS_THREADSAFE`` caused a crash when mounting the filesystem
* added "extends = " to MM legacy buildenvs
* make sure that flash_mode is always well-defined

platformio.ini

@@ -333,6 +333,7 @@ platform = espressif32@3.5.0
 platform_packages = framework-arduinoespressif32 @ https://github.com/Aircoookie/arduino-esp32.git#1.0.6.4
 build_unflags = ${common.build_unflags}
   -Wshadow=compatible-local ;; not supported by older compilers
+  ;; -D CORE_DEBUG_LEVEL=0 -DNDEBUG ;; enable core debugging
 build_flags = -g
   -Wno-unused-variable -Wno-unused-function ;; removes noise
   -DARDUINO_ARCH_ESP32
@@ -340,7 +341,8 @@ build_flags = -g
   -D CONFIG_ASYNC_TCP_TASK_STACK_SIZE=9472                ;; WLEDMM increase stack by 1.25Kb, as audioreactive needs bigger SETTINGS_STACK_BUF_SIZE
   -D CONFIG_ASYNC_TCP_STACK_SIZE=9472
   -D LOROL_LITTLEFS                                       ;; use LITTLEFS library by lorol in ESP32 core 1.x.x instead of built-in in 2.x.x
-  -DCONFIG_LITTLEFS_FOR_IDF_3_2 -DLFS_THREADSAFE
+  ;; -D CORE_DEBUG_LEVEL=5 ;; enable core debug messages
+  ;; -DDEBUG -DWLED_DEBUG   ;; enable WLED debug messages
 lib_deps =
   esp32async/AsyncTCP @ 3.4.7
   ; https://github.com/lorol/LITTLEFS.git
@@ -348,11 +350,12 @@ lib_deps =
   makuna/NeoPixelBus @ 2.7.5
   ;; makuna/NeoPixelBus @ 2.7.9 ;; experimental
   ${env.lib_deps}
+monitor_filters = esp32_exception_decoder
 board_build.partitions = ${esp32.default_partitions}      ;; default partioning for 4MB Flash - can be overridden in build envs
 default_partitions = ${esp32.default_partitions}          ;; backwards compatibility
 board_build.f_flash = 80000000L
 board_build.flash_mode = dout                             ;; avoid dio/quot/qio - these are broken in arduino-esp32 1.0.6.x
-
+;;board_build.flash_mode = dio
 
 ;; standard platform for esp32
 [esp32]
@@ -376,6 +379,8 @@ monitor_filters = esp32_exception_decoder
 AR_build_flags = ${common_mm.AR_build_flags}
 AR_lib_deps = ${common_mm.AR_lib_deps}      ;; optimized version, 10% faster on -S2/-C3
 board_build.partitions = ${esp32.default_partitions}   ;; default partioning for 4MB Flash - can be overridden in build envs
+board_build.f_flash = 80000000L
+board_build.flash_mode = dio
 
 ;; WLEDMM begin
 
@@ -449,6 +454,9 @@ lib_deps =
   ;; makuna/NeoPixelBus @ 2.7.9 ;; experimental
   ${env.lib_deps}
 board_build.partitions = ${esp32.default_partitions}   ;; default partioning for 4MB Flash - can be overridden in build envs
+monitor_filters = esp32_exception_decoder
+board_build.f_flash = 80000000L
+board_build.flash_mode = dio
 
 [esp32s2]
 ;; generic definitions for all ESP32-S2 boards
@@ -637,6 +645,7 @@ extends = env:esp32_4MB_PSRAM_S
 
 ;; legacy build for OTA compatibility with upstream 0.15.x, slow but safe
 [env:esp32dev_compat]
+extends = esp32_legacy
 board = esp32dev
 platform = ${esp32_legacy.platform}
 platform_packages = ${esp32_legacy.platform_packages}
@@ -652,6 +661,7 @@ monitor_filters = esp32_exception_decoder
 
 ;; legacy build for OTA compatibility with upstream 0.15.x, faster due to qio mode
 [env:esp32dev_qio80_compat]
+extends = esp32_legacy
 board = esp32dev
 platform = ${esp32_legacy.platform}
 platform_packages = ${esp32_legacy.platform_packages}
@@ -686,6 +696,7 @@ extends = env:esp32_4MB_M_eth
 ;; legacy build for OTA compatibility with upstream 0.15.x
 ;; --> use [env:esp32_4MB_M_eth] (4MB) or [env:esp32_16MB_M_eth] 
 [env:esp32_eth_compat]
+extends = esp32_legacy
 board = esp32-poe
 platform = ${esp32_legacy.platform}
 platform_packages = ${esp32_legacy.platform_packages}
@@ -1227,6 +1238,7 @@ lib_deps_XL =
 
 ; common defaults for all MM environments
 [esp32_4MB_S_base]
+extends = esp32_legacy
 board = esp32dev
 ;; legacy V3 platform
 platform = ${esp32_legacy.platform}