[sylefeb]

Hi (author) - Thanks! I would like to support FIRRTL very much, I have looked into it a bit in the past and that all looks feasible. It is a rather big feature though, so it will take some time.

Lua is used as a pre-processor language. This is quite powerful, for instance to automatically generate code, read data into BRAMs (for init), for example RISCV compiled code or DooM wad data (!!). This is used in most projects, see for instance 'pipeline_sort', 'ice-v' or 'doomchip' (a bit extreme there). All lines starting with $$ are pre-processor code, and inserts such as $N$ concatenate the Lua generated N in the Silice code. You can for instance write a for loop with Lua that will duplicate Silice code to e.g. generate a sorting network.