How open is the toolchain/SDK for Renesas parts?
I.e. can they be used with gcc/gdb/(c)make with reasonably low effort (like esp32, stm32, rp2040) or is the only realistic option using their IDE?
their official fat sdk is a run of the mill eclipse reskin w the usual gcc ports and half working libc options last i used it :-)
What defense area? I've done a ton of random aerospace stuff and usually end up using STM or NXP. All the critical systems have been some horrifying PPC or Sparc derivative.