optionally move float emulation code into iram (#8958)

* optionally move float emulation code into iram
allows doing float operation in iram
suitable for libraries like AccelStepper when called from ISR
* proposed changes for pio from @mcspr

boards.txt

@@ -24,6 +24,7 @@ menu.exception=C++ Exceptions
 menu.stacksmash=Stack Protection
 menu.wipe=Erase Flash
 menu.sdk=NONOS SDK Version
+menu.iramfloat=Floating Point operations
 menu.ssl=SSL Support
 menu.mmu=MMU
 menu.non32xfer=Non-32-Bit Access
@@ -496,6 +497,10 @@ generic.menu.eesz.autoflash.build.flash_size=16M
 generic.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 generic.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 generic.menu.eesz.autoflash.upload.maximum_size=1044464
+generic.menu.iramfloat.no=in IROM
+generic.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+generic.menu.iramfloat.yes=allowed in ISR
+generic.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 esp8285.name=Generic ESP8285 Module
@@ -848,6 +853,10 @@ esp8285.menu.eesz.autoflash.build.flash_size=16M
 esp8285.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 esp8285.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 esp8285.menu.eesz.autoflash.upload.maximum_size=1044464
+esp8285.menu.iramfloat.no=in IROM
+esp8285.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+esp8285.menu.iramfloat.yes=allowed in ISR
+esp8285.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 gen4iod.name=4D Systems gen4 IoD Range
@@ -1123,6 +1132,10 @@ gen4iod.menu.eesz.autoflash.build.flash_size=16M
 gen4iod.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 gen4iod.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 gen4iod.menu.eesz.autoflash.upload.maximum_size=1044464
+gen4iod.menu.iramfloat.no=in IROM
+gen4iod.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+gen4iod.menu.iramfloat.yes=allowed in ISR
+gen4iod.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 huzzah.name=Adafruit Feather HUZZAH ESP8266
@@ -1342,6 +1355,10 @@ huzzah.menu.eesz.autoflash.build.flash_size=16M
 huzzah.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 huzzah.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 huzzah.menu.eesz.autoflash.upload.maximum_size=1044464
+huzzah.menu.iramfloat.no=in IROM
+huzzah.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+huzzah.menu.iramfloat.yes=allowed in ISR
+huzzah.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 wifi_slot.name=Amperka WiFi Slot
@@ -1655,6 +1672,10 @@ wifi_slot.menu.eesz.autoflash.build.flash_size=16M
 wifi_slot.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 wifi_slot.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 wifi_slot.menu.eesz.autoflash.upload.maximum_size=1044464
+wifi_slot.menu.iramfloat.no=in IROM
+wifi_slot.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+wifi_slot.menu.iramfloat.yes=allowed in ISR
+wifi_slot.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 arduino-esp8266.name=Arduino
@@ -1886,6 +1907,10 @@ arduino-esp8266.menu.eesz.autoflash.build.flash_size=16M
 arduino-esp8266.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 arduino-esp8266.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 arduino-esp8266.menu.eesz.autoflash.upload.maximum_size=1044464
+arduino-esp8266.menu.iramfloat.no=in IROM
+arduino-esp8266.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+arduino-esp8266.menu.iramfloat.yes=allowed in ISR
+arduino-esp8266.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 espmxdevkit.name=DOIT ESP-Mx DevKit (ESP8285)
@@ -2138,6 +2163,10 @@ espmxdevkit.menu.eesz.autoflash.build.flash_size=16M
 espmxdevkit.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 espmxdevkit.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 espmxdevkit.menu.eesz.autoflash.upload.maximum_size=1044464
+espmxdevkit.menu.iramfloat.no=in IROM
+espmxdevkit.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+espmxdevkit.menu.iramfloat.yes=allowed in ISR
+espmxdevkit.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 oak.name=Digistump Oak
@@ -2358,6 +2387,10 @@ oak.menu.eesz.autoflash.build.flash_size=16M
 oak.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 oak.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 oak.menu.eesz.autoflash.upload.maximum_size=1044464
+oak.menu.iramfloat.no=in IROM
+oak.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+oak.menu.iramfloat.yes=allowed in ISR
+oak.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 espduino.name=ESPDuino (ESP-13 Module)
@@ -2585,6 +2618,10 @@ espduino.menu.eesz.autoflash.build.flash_size=16M
 espduino.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 espduino.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 espduino.menu.eesz.autoflash.upload.maximum_size=1044464
+espduino.menu.iramfloat.no=in IROM
+espduino.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+espduino.menu.iramfloat.yes=allowed in ISR
+espduino.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 espectro.name=ESPectro Core
@@ -2804,6 +2841,10 @@ espectro.menu.eesz.autoflash.build.flash_size=16M
 espectro.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 espectro.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 espectro.menu.eesz.autoflash.upload.maximum_size=1044464
+espectro.menu.iramfloat.no=in IROM
+espectro.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+espectro.menu.iramfloat.yes=allowed in ISR
+espectro.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 espino.name=ESPino (ESP-12 Module)
@@ -3026,6 +3067,10 @@ espino.menu.eesz.autoflash.build.flash_size=16M
 espino.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 espino.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 espino.menu.eesz.autoflash.upload.maximum_size=1044464
+espino.menu.iramfloat.no=in IROM
+espino.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+espino.menu.iramfloat.yes=allowed in ISR
+espino.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 espresso_lite_v1.name=ESPresso Lite 1.0
@@ -3248,6 +3293,10 @@ espresso_lite_v1.menu.eesz.autoflash.build.flash_size=16M
 espresso_lite_v1.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 espresso_lite_v1.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 espresso_lite_v1.menu.eesz.autoflash.upload.maximum_size=1044464
+espresso_lite_v1.menu.iramfloat.no=in IROM
+espresso_lite_v1.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+espresso_lite_v1.menu.iramfloat.yes=allowed in ISR
+espresso_lite_v1.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 espresso_lite_v2.name=ESPresso Lite 2.0
@@ -3470,6 +3519,10 @@ espresso_lite_v2.menu.eesz.autoflash.build.flash_size=16M
 espresso_lite_v2.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 espresso_lite_v2.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 espresso_lite_v2.menu.eesz.autoflash.upload.maximum_size=1044464
+espresso_lite_v2.menu.iramfloat.no=in IROM
+espresso_lite_v2.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+espresso_lite_v2.menu.iramfloat.yes=allowed in ISR
+espresso_lite_v2.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 sonoff.name=ITEAD Sonoff
@@ -3730,6 +3783,10 @@ sonoff.menu.eesz.autoflash.build.flash_size=16M
 sonoff.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 sonoff.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 sonoff.menu.eesz.autoflash.upload.maximum_size=1044464
+sonoff.menu.iramfloat.no=in IROM
+sonoff.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+sonoff.menu.iramfloat.yes=allowed in ISR
+sonoff.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 inventone.name=Invent One
@@ -3949,6 +4006,10 @@ inventone.menu.eesz.autoflash.build.flash_size=16M
 inventone.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 inventone.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 inventone.menu.eesz.autoflash.upload.maximum_size=1044464
+inventone.menu.iramfloat.no=in IROM
+inventone.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+inventone.menu.iramfloat.yes=allowed in ISR
+inventone.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 d1_wroom_02.name=LOLIN(WEMOS) D1 ESP-WROOM-02
@@ -4184,6 +4245,10 @@ d1_wroom_02.menu.eesz.autoflash.build.flash_size=16M
 d1_wroom_02.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 d1_wroom_02.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 d1_wroom_02.menu.eesz.autoflash.upload.maximum_size=1044464
+d1_wroom_02.menu.iramfloat.no=in IROM
+d1_wroom_02.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+d1_wroom_02.menu.iramfloat.yes=allowed in ISR
+d1_wroom_02.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 d1_mini.name=LOLIN(WEMOS) D1 R2 & mini
@@ -4403,6 +4468,10 @@ d1_mini.menu.eesz.autoflash.build.flash_size=16M
 d1_mini.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 d1_mini.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 d1_mini.menu.eesz.autoflash.upload.maximum_size=1044464
+d1_mini.menu.iramfloat.no=in IROM
+d1_mini.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+d1_mini.menu.iramfloat.yes=allowed in ISR
+d1_mini.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 d1_mini_clone.name=LOLIN(WEMOS) D1 mini (clone)
@@ -4639,6 +4708,10 @@ d1_mini_clone.menu.eesz.autoflash.build.flash_size=16M
 d1_mini_clone.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 d1_mini_clone.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 d1_mini_clone.menu.eesz.autoflash.upload.maximum_size=1044464
+d1_mini_clone.menu.iramfloat.no=in IROM
+d1_mini_clone.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+d1_mini_clone.menu.iramfloat.yes=allowed in ISR
+d1_mini_clone.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 d1_mini_lite.name=LOLIN(WEMOS) D1 mini Lite
@@ -4890,6 +4963,10 @@ d1_mini_lite.menu.eesz.autoflash.build.flash_size=16M
 d1_mini_lite.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 d1_mini_lite.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 d1_mini_lite.menu.eesz.autoflash.upload.maximum_size=1044464
+d1_mini_lite.menu.iramfloat.no=in IROM
+d1_mini_lite.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+d1_mini_lite.menu.iramfloat.yes=allowed in ISR
+d1_mini_lite.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 d1_mini_pro.name=LOLIN(WEMOS) D1 mini Pro
@@ -5101,6 +5178,10 @@ d1_mini_pro.menu.eesz.autoflash.build.flash_size=16M
 d1_mini_pro.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 d1_mini_pro.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 d1_mini_pro.menu.eesz.autoflash.upload.maximum_size=1044464
+d1_mini_pro.menu.iramfloat.no=in IROM
+d1_mini_pro.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+d1_mini_pro.menu.iramfloat.yes=allowed in ISR
+d1_mini_pro.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 d1.name=LOLIN(WeMos) D1 R1
@@ -5320,6 +5401,10 @@ d1.menu.eesz.autoflash.build.flash_size=16M
 d1.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 d1.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 d1.menu.eesz.autoflash.upload.maximum_size=1044464
+d1.menu.iramfloat.no=in IROM
+d1.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+d1.menu.iramfloat.yes=allowed in ISR
+d1.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 agruminolemon.name=Lifely Agrumino Lemon v4
@@ -5555,6 +5640,10 @@ agruminolemon.menu.eesz.autoflash.build.flash_size=16M
 agruminolemon.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 agruminolemon.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 agruminolemon.menu.eesz.autoflash.upload.maximum_size=1044464
+agruminolemon.menu.iramfloat.no=in IROM
+agruminolemon.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+agruminolemon.menu.iramfloat.yes=allowed in ISR
+agruminolemon.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 nodemcu.name=NodeMCU 0.9 (ESP-12 Module)
@@ -5774,6 +5863,10 @@ nodemcu.menu.eesz.autoflash.build.flash_size=16M
 nodemcu.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 nodemcu.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 nodemcu.menu.eesz.autoflash.upload.maximum_size=1044464
+nodemcu.menu.iramfloat.no=in IROM
+nodemcu.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+nodemcu.menu.iramfloat.yes=allowed in ISR
+nodemcu.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 nodemcuv2.name=NodeMCU 1.0 (ESP-12E Module)
@@ -5997,6 +6090,10 @@ nodemcuv2.menu.eesz.autoflash.build.flash_size=16M
 nodemcuv2.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 nodemcuv2.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 nodemcuv2.menu.eesz.autoflash.upload.maximum_size=1044464
+nodemcuv2.menu.iramfloat.no=in IROM
+nodemcuv2.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+nodemcuv2.menu.iramfloat.yes=allowed in ISR
+nodemcuv2.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 modwifi.name=Olimex MOD-WIFI-ESP8266(-DEV)
@@ -6247,6 +6344,10 @@ modwifi.menu.eesz.autoflash.build.flash_size=16M
 modwifi.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 modwifi.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 modwifi.menu.eesz.autoflash.upload.maximum_size=1044464
+modwifi.menu.iramfloat.no=in IROM
+modwifi.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+modwifi.menu.iramfloat.yes=allowed in ISR
+modwifi.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 phoenix_v1.name=Phoenix 1.0
@@ -6469,6 +6570,10 @@ phoenix_v1.menu.eesz.autoflash.build.flash_size=16M
 phoenix_v1.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 phoenix_v1.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 phoenix_v1.menu.eesz.autoflash.upload.maximum_size=1044464
+phoenix_v1.menu.iramfloat.no=in IROM
+phoenix_v1.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+phoenix_v1.menu.iramfloat.yes=allowed in ISR
+phoenix_v1.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 phoenix_v2.name=Phoenix 2.0
@@ -6691,6 +6796,10 @@ phoenix_v2.menu.eesz.autoflash.build.flash_size=16M
 phoenix_v2.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 phoenix_v2.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 phoenix_v2.menu.eesz.autoflash.upload.maximum_size=1044464
+phoenix_v2.menu.iramfloat.no=in IROM
+phoenix_v2.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+phoenix_v2.menu.iramfloat.yes=allowed in ISR
+phoenix_v2.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 eduinowifi.name=Schirmilabs Eduino WiFi
@@ -6910,6 +7019,10 @@ eduinowifi.menu.eesz.autoflash.build.flash_size=16M
 eduinowifi.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 eduinowifi.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 eduinowifi.menu.eesz.autoflash.upload.maximum_size=1044464
+eduinowifi.menu.iramfloat.no=in IROM
+eduinowifi.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+eduinowifi.menu.iramfloat.yes=allowed in ISR
+eduinowifi.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 wiolink.name=Seeed Wio Link
@@ -7129,6 +7242,10 @@ wiolink.menu.eesz.autoflash.build.flash_size=16M
 wiolink.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 wiolink.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 wiolink.menu.eesz.autoflash.upload.maximum_size=1044464
+wiolink.menu.iramfloat.no=in IROM
+wiolink.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+wiolink.menu.iramfloat.yes=allowed in ISR
+wiolink.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 blynk.name=SparkFun Blynk Board
@@ -7348,6 +7465,10 @@ blynk.menu.eesz.autoflash.build.flash_size=16M
 blynk.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 blynk.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 blynk.menu.eesz.autoflash.upload.maximum_size=1044464
+blynk.menu.iramfloat.no=in IROM
+blynk.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+blynk.menu.iramfloat.yes=allowed in ISR
+blynk.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 thing.name=SparkFun ESP8266 Thing
@@ -7567,6 +7688,10 @@ thing.menu.eesz.autoflash.build.flash_size=16M
 thing.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 thing.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 thing.menu.eesz.autoflash.upload.maximum_size=1044464
+thing.menu.iramfloat.no=in IROM
+thing.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+thing.menu.iramfloat.yes=allowed in ISR
+thing.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 thingdev.name=SparkFun ESP8266 Thing Dev
@@ -7786,6 +7911,10 @@ thingdev.menu.eesz.autoflash.build.flash_size=16M
 thingdev.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 thingdev.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 thingdev.menu.eesz.autoflash.upload.maximum_size=1044464
+thingdev.menu.iramfloat.no=in IROM
+thingdev.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+thingdev.menu.iramfloat.yes=allowed in ISR
+thingdev.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 esp210.name=SweetPea ESP-210
@@ -8005,6 +8134,10 @@ esp210.menu.eesz.autoflash.build.flash_size=16M
 esp210.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 esp210.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 esp210.menu.eesz.autoflash.upload.maximum_size=1044464
+esp210.menu.iramfloat.no=in IROM
+esp210.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+esp210.menu.iramfloat.yes=allowed in ISR
+esp210.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 espinotee.name=ThaiEasyElec's ESPino
@@ -8224,6 +8357,10 @@ espinotee.menu.eesz.autoflash.build.flash_size=16M
 espinotee.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 espinotee.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 espinotee.menu.eesz.autoflash.upload.maximum_size=1044464
+espinotee.menu.iramfloat.no=in IROM
+espinotee.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+espinotee.menu.iramfloat.yes=allowed in ISR
+espinotee.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 wifi_kit_8.name=WiFi Kit 8
@@ -8443,6 +8580,10 @@ wifi_kit_8.menu.eesz.autoflash.build.flash_size=16M
 wifi_kit_8.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 wifi_kit_8.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 wifi_kit_8.menu.eesz.autoflash.upload.maximum_size=1044464
+wifi_kit_8.menu.iramfloat.no=in IROM
+wifi_kit_8.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+wifi_kit_8.menu.iramfloat.yes=allowed in ISR
+wifi_kit_8.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 wifiduino.name=WiFiduino
@@ -8662,6 +8803,10 @@ wifiduino.menu.eesz.autoflash.build.flash_size=16M
 wifiduino.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 wifiduino.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 wifiduino.menu.eesz.autoflash.upload.maximum_size=1044464
+wifiduino.menu.iramfloat.no=in IROM
+wifiduino.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+wifiduino.menu.iramfloat.yes=allowed in ISR
+wifiduino.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 wifinfo.name=WifInfo
@@ -8937,6 +9082,10 @@ wifinfo.menu.eesz.autoflash.build.flash_size=16M
 wifinfo.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 wifinfo.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 wifinfo.menu.eesz.autoflash.upload.maximum_size=1044464
+wifinfo.menu.iramfloat.no=in IROM
+wifinfo.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+wifinfo.menu.iramfloat.yes=allowed in ISR
+wifinfo.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 
 ##############################################################
 cw01.name=XinaBox CW01
@@ -9159,4 +9308,8 @@ cw01.menu.eesz.autoflash.build.flash_size=16M
 cw01.menu.eesz.autoflash.build.flash_ld=eagle.flash.auto.ld
 cw01.menu.eesz.autoflash.build.extra_flags=-DFLASH_MAP_SUPPORT=1
 cw01.menu.eesz.autoflash.upload.maximum_size=1044464
+cw01.menu.iramfloat.no=in IROM
+cw01.menu.iramfloat.no.build.iramfloat=-DFP_IN_IROM
+cw01.menu.iramfloat.yes=allowed in ISR
+cw01.menu.iramfloat.yes.build.iramfloat=-DFP_IN_IRAM
 

doc/ideoptions.rst

@@ -263,6 +263,12 @@ See our issue tracker in regards to default version selection.
 
 Notice that 3.x.x is provided **as-is** and remains **experimental**.
 
+Floating Point operations
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- ``in IROM``: This provides more free space in IRAM but disallows using floating operations inside ISRs.
+- ``allowed in ISR``: Floats can be used in ISRs, cost is ~1KB IRAM when floats are used.
+
 SSL Support
 ~~~~~~~~~~~
 

package/package_esp8266com_index.template.json

@@ -383,4 +383,4 @@
          ]
       }
    ]
-}
+}

platform.txt

@@ -62,6 +62,9 @@ build.spiffs_start=
 build.spiffs_end=
 build.spiffs_blocksize=
 
+# soft float location
+build.iramfloat=-DFP_IN_IROM
+
 # Fully qualified file names for processing sketch global options
 globals.h.source.fqfn={build.source.path}/{build.project_name}.globals.h
 commonhfile.fqfn={build.core.path}/CommonHFile.h
@@ -79,7 +82,7 @@ compiler.cpreprocessor.flags=-D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -D_GNU_S
 compiler.libraries.ldflags=
 
 compiler.c.cmd=xtensa-lx106-elf-gcc
-compiler.c.flags=-c "{compiler.warning_flags}-cflags" -std=gnu17 {build.stacksmash_flags} -g -free -fipa-pta -Werror=return-type -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mtext-section-literals -falign-functions=4 -MMD -ffunction-sections -fdata-sections {build.exception_flags} {build.sslflags} {build.mmuflags} {build.non32xferflags}
+compiler.c.flags=-c "{compiler.warning_flags}-cflags" -std=gnu17 {build.stacksmash_flags} -g -free -fipa-pta -Werror=return-type -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mtext-section-literals -falign-functions=4 -MMD -ffunction-sections -fdata-sections {build.exception_flags} {build.sslflags} {build.mmuflags} {build.non32xferflags} {build.iramfloat}
 
 compiler.S.cmd=xtensa-lx106-elf-gcc
 compiler.S.flags=-c -g -x assembler-with-cpp -MMD -mlongcalls "-I{runtime.tools.xtensa-lx106-elf-gcc.path}/include/"
@@ -90,7 +93,7 @@ compiler.c.elf.cmd=xtensa-lx106-elf-gcc
 compiler.c.elf.libs=-lhal -lphy -lpp -lnet80211 {build.lwip_lib} -lwpa -lcrypto -lmain -lwps -lbearssl -lespnow -lsmartconfig -lairkiss -lwpa2 {build.stdcpp_lib} -lm -lc -lgcc
 
 compiler.cpp.cmd=xtensa-lx106-elf-g++
-compiler.cpp.flags=-c "{compiler.warning_flags}-cppflags" {build.stacksmash_flags} -g -free -fipa-pta -Werror=return-type -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 {build.stdcpp_level} -MMD -ffunction-sections -fdata-sections {build.exception_flags} {build.sslflags} {build.mmuflags} {build.non32xferflags}
+compiler.cpp.flags=-c "{compiler.warning_flags}-cppflags" {build.stacksmash_flags} -g -free -fipa-pta -Werror=return-type -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 {build.stdcpp_level} -MMD -ffunction-sections -fdata-sections {build.exception_flags} {build.sslflags} {build.mmuflags} {build.non32xferflags} {build.iramfloat}
 
 compiler.as.cmd=xtensa-lx106-elf-as
 
@@ -128,7 +131,7 @@ recipe.hooks.prebuild.2.pattern="{runtime.tools.python3.path}/python3" -I "{runt
 recipe.hooks.linking.prelink.1.pattern="{runtime.tools.python3.path}/python3" -I "{runtime.tools.mkdir}" -p "{build.path}/ld_h/"
 recipe.hooks.linking.prelink.2.pattern="{runtime.tools.python3.path}/python3" -I "{runtime.tools.cp}" "{runtime.platform.path}/tools/sdk/ld/{build.flash_ld}" "{build.path}/ld_h/local.eagle.flash.ld.h"
 recipe.hooks.linking.prelink.3.pattern="{compiler.path}{compiler.c.cmd}" -CC -E -P {build.vtable_flags} {build.mmuflags} "{build.path}/ld_h/local.eagle.flash.ld.h" -o "{build.path}/local.eagle.flash.ld"
-recipe.hooks.linking.prelink.4.pattern="{compiler.path}{compiler.c.cmd}" -CC -E -P {build.vtable_flags} {build.mmuflags} "{runtime.platform.path}/tools/sdk/ld/eagle.app.v6.common.ld.h" -o "{build.path}/local.eagle.app.v6.common.ld"
+recipe.hooks.linking.prelink.4.pattern="{compiler.path}{compiler.c.cmd}" {build.iramfloat} -CC -E -P {build.vtable_flags} {build.mmuflags} "{runtime.platform.path}/tools/sdk/ld/eagle.app.v6.common.ld.h" -o "{build.path}/local.eagle.app.v6.common.ld"
 
 ## Compile c files
 recipe.c.o.pattern="{compiler.path}{compiler.c.cmd}" {compiler.cpreprocessor.flags} {compiler.c.flags} -D{build.sdk}=1 -DF_CPU={build.f_cpu} {build.lwip_flags} {build.debug_port} {build.debug_level} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} -DARDUINO_BOARD="{build.board}" -DARDUINO_BOARD_ID="{_id}" {build.led} {build.flash_flags} {compiler.c.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"

tools/boards.txt.py

@@ -1682,6 +1682,17 @@ def sdk ():
 
 ################################################################
 
+def float_in_iram ():
+    return { 'iramfloat': collections.OrderedDict([
+                        ('.menu.iramfloat.no', 'in IROM'),
+                        ('.menu.iramfloat.no.build.iramfloat', '-DFP_IN_IROM'),
+                        ('.menu.iramfloat.yes', 'allowed in ISR'),
+                        ('.menu.iramfloat.yes.build.iramfloat', '-DFP_IN_IRAM'),
+                    ])
+           }
+
+################################################################
+
 def all_boards ():
 
     if boardsgen or boardslocalgen:
@@ -1709,6 +1720,7 @@ def all_boards ():
     macros.update(led('led',    led_default, range(0,led_max+1)))
     macros.update(led('led216', 2,           { 16 }))
     macros.update(sdk())
+    macros.update(float_in_iram())
 
     if boardfilteropt or excludeboards:
         print('#')
@@ -1754,6 +1766,7 @@ def all_boards ():
     print('menu.stacksmash=Stack Protection')
     print('menu.wipe=Erase Flash')
     print('menu.sdk=NONOS SDK Version')
+    print('menu.iramfloat=Floating Point operations')
     print('menu.ssl=SSL Support')
     print('menu.mmu=MMU')
     print('menu.non32xfer=Non-32-Bit Access')
@@ -1791,6 +1804,7 @@ def all_boards ():
             macrolist += speeds[default_speed]
 
         macrolist += [ 'autoflash' ]
+        macrolist += [ 'iramfloat' ]
 
         for block in macrolist:
             for optname in macros[block]:

tools/platformio-build.py

@@ -275,17 +275,23 @@ else:
 #
 
 current_vtables = None
-fp_in_irom = ""
+current_fp = None
 for d in flatten_cppdefines:
     if str(d).startswith("VTABLES_IN_"):
         current_vtables = d
-    if str(d) == "FP_IN_IROM":
-        fp_in_irom = "-DFP_IN_IROM"
+    if str(d).startswith("FP_IN_"):
+        current_fp = d
+
 if not current_vtables:
     current_vtables = "VTABLES_IN_FLASH"
     env.Append(CPPDEFINES=[current_vtables])
 assert current_vtables
 
+if not current_fp:
+    current_fp = "FP_IN_IROM"
+    env.Append(CPPDEFINES=[current_fp])
+assert current_fp
+
 #
 # MMU
 #
@@ -363,9 +369,10 @@ app_ld = env.Command(
     join("$BUILD_DIR", "ld", "local.eagle.app.v6.common.ld"),
     join(FRAMEWORK_DIR, "tools", "sdk", "ld", "eagle.app.v6.common.ld.h"),
     env.VerboseAction(
-        "$CC -CC -E -P -D%s %s %s $SOURCE -o $TARGET"
+        "$CC -CC -E -P -D%s -D%s %s $SOURCE -o $TARGET"
         % (
             current_vtables,
+            current_fp,
             # String representation of MMU flags
             " ".join(
                 [
@@ -373,7 +380,6 @@ app_ld = env.Command(
                     for f in mmu_flags
                 ]
             ),
-            fp_in_irom,
         ),
         "Generating LD script $TARGET",
     ),

tools/sdk/ld/eagle.app.v6.common.ld.h

@@ -142,6 +142,16 @@ SECTIONS
 
     /* all functional callers are placed in IRAM (including SPI/IRQ callbacks/etc) here */
     *(.text._ZNKSt8functionIF*EE*)  /* std::function<any(...)>::operator()() const */
+
+#ifdef FP_IN_IRAM
+    *libgcc.a:*f2.o(.literal .text)
+    *libgcc.a:*f3.o(.literal .text)
+    *libgcc.a:*fsi.o(.literal .text)
+    *libgcc.a:*fdi.o(.literal .text)
+    *libgcc.a:*ifs.o(.literal .text)
+    *libgcc.a:*idf.o(.literal .text)
+#endif
+
   } >iram1_0_seg :iram1_0_phdr
 
   .irom0.text : ALIGN(4)