Yes,the idea is to use the Ghidra decompiler to ease reversing new parts of the FlashAir firmware.

The MeP-c4 datasheet is available at https://www.datasheetarchive.com/pdf/download.php?id=6693e80...

I had success compiling GCC with MeP support using git and the commit before the removal. Yet, I believe that FlashAir are not compiled with gcc.