I downloaded https://developer.arm.com/-/media/Files/downloads/gnu/12.3.rel1/binrel/arm-gnu-toolchain-12.3.rel1-mingw-w64-i686-aarch64-none-elf.zip?rev=b9e2d7090d0240cca2dfa9a902666e4c&hash=AED4968D976D424304AF2B940E633A5C
I extracted the archive and copied the folder within to C:opt.
I then edited rtconfig.py in bspraspberry-piraspi-64 so that the EXEC_PATH was C:opttoolchainbin.
I then typed scons in the terminal window and it keeps complaining it cannot find aarch64-none-elf-gcc.
What did I forget?