Open gardners opened 3 months ago
Display symbols in binary sorted by size:
nm -S --size-sort -a openFPGALoader | c++filt
Can help target the things to remove to gain most size reduction
Linux binary reduced from ~4.2MB to ~1MB.
A lot of the binary now seems to be taken up with C++ __static_initialization_and_destruction_0(int,int) symbols. At least 20% and probably more of the remaining binary size is these.
Given the above, it might make sense to focus on "de-C++ing" what remains, starting with lattice.cpp, and making a lattice.c that can work with only a local bit-bashing JTAG interface, and recursively addressing dependencies to do that as we go.
The JED file parser would be nice to get rid of, too, by making a standalone tool that can turn a .JED file into whatever actually needs to be written to the CPLD via JTAG.
We want to eventually port this to run natively on the MEGA65 for flashing the MEGA65 keyboard Lattice CPLD. I assume LLVM-MOS will be the compiler of choice, since we need C++
It needs to support only Lattice ICE40 parts, It should retain support for FTDI JTAG adaptors so that during testing we can continue to confirm function with a TE0790. But once we move forward, we will need only bit-bashing JTAG support, probably by greatly simplifying the libgpiod support.