8266 optional build flags to increase IRAM

related to Aircoookie#3364

platformio.ini

@@ -87,11 +87,13 @@ platform_packages = platformio/framework-arduinoespressif8266
 
 # ------------------------------------------------------------------------------
 # FLAGS: DEBUG
-#
+# esp8266 : see https://docs.platformio.org/en/latest/platforms/espressif8266.html#debug-level
+# esp32   : see https://docs.platformio.org/en/latest/platforms/espressif32.html#debug-level
 # ------------------------------------------------------------------------------
-debug_flags = -D DEBUG=1 -D WLED_DEBUG -DDEBUG_ESP_WIFI -DDEBUG_ESP_HTTP_CLIENT -DDEBUG_ESP_HTTP_UPDATE -DDEBUG_ESP_HTTP_SERVER -DDEBUG_ESP_UPDATER -DDEBUG_ESP_OTA -DDEBUG_TLS_MEM
-#if needed (for memleaks etc) also add; -DDEBUG_ESP_OOM -include "umm_malloc/umm_malloc_cfg.h"
-#-DDEBUG_ESP_CORE is not working right now
+debug_flags = -D DEBUG=1 -D WLED_DEBUG
+  -DDEBUG_ESP_WIFI -DDEBUG_ESP_HTTP_CLIENT -DDEBUG_ESP_HTTP_UPDATE -DDEBUG_ESP_HTTP_SERVER -DDEBUG_ESP_UPDATER -DDEBUG_ESP_OTA -DDEBUG_TLS_MEM ;; for esp8266
+  # if needed (for memleaks etc) also add; -DDEBUG_ESP_OOM -include "umm_malloc/umm_malloc_cfg.h"
+  # -DDEBUG_ESP_CORE is not working right now
 
 # ------------------------------------------------------------------------------
 # FLAGS: ldscript (available ldscripts at https://github.com/esp8266/Arduino/tree/master/tools/sdk/ld)
@@ -214,6 +216,9 @@ build_flags =
   -DVTABLES_IN_FLASH
   ; restrict to minimal mime-types
   -DMIMETYPE_MINIMAL
+  ; other special-purpose framework flags (see https://docs.platformio.org/en/latest/platforms/espressif8266.html)
+  ; -D PIO_FRAMEWORK_ARDUINO_MMU_CACHE16_IRAM48 ;; in case of linker errors like "section `.text1' will not fit in region `iram1_0_seg'"
+  ; -D PIO_FRAMEWORK_ARDUINO_MMU_CACHE16_IRAM48_SECHEAP_SHARED ;; (experimental) adds some extra heap, but may cause slowdown
 
 lib_deps =
   #https://github.com/lorol/LITTLEFS.git