Make STM compile again and update toolchain.

[caveman99]

The binary is too big for the flash. WIP

[github-actions]

🤖 Pull request artifacts

file	commit
pr2960-firmware-2.2.14.c7fa4fc.zip	c7fa4fc

[geeksville]

This pull request has been mentioned on Meshtastic. There might be relevant details there:

https://meshtastic.discourse.group/t/linking-failed-to-generate-firmware-elf-cannot-find-larm-cortexm4lf-math-for-wio-e5-variant-lora-e5-branch/11050/2

[jp-bennett]

Set MAX_NUM_NODES super low in your variant.h, and see if it gives you enough headroom.
I merged locally and attempted this. Getting errors

/home/jbennett/.platformio/packages/framework-arduinoststm32/system/Drivers/CMSIS/Device/ST/STM32WLxx/Include/stm32wle5xx.h:993:47: error: expected ')' before '*' token
  993 | #define RNG                     ((RNG_TypeDef *) RNG_BASE)
      |                                  ~            ^
.pio/libdeps/rak3172/Crypto/RNG.cpp:159:10: note: in expansion of macro 'RNG'
  159 | RNGClass RNG;

[caveman99]

Set MAX_NUM_NODES super low in your variant.h, and see if it gives you enough headroom. I merged locally and attempted this. Getting errors

/home/jbennett/.platformio/packages/framework-arduinoststm32/system/Drivers/CMSIS/Device/ST/STM32WLxx/Include/stm32wle5xx.h:993:47: error: expected ')' before '*' token
  993 | #define RNG                     ((RNG_TypeDef *) RNG_BASE)
      |                                  ~            ^
.pio/libdeps/rak3172/Crypto/RNG.cpp:159:10: note: in expansion of macro 'RNG'
  159 | RNGClass RNG;

The RNG stuff is from a double macro definition in the used crypto lib. i might swap that out for another one. locally it builds with a modified copy. Maxnodes is a good pointer...

[jp-bennett]

Another flash saving potential is the unishox library. It's only actually used for ATAK packets. #ifdef it out of existence, to save a few more bytes.