dump - print parts of the design in RTLIL format

yosys> help dump

dump [options] [selection]

Write the selected parts of the design to the console or specified file in
RTLIL format.

-m

also dump the module headers, even if only parts of a single
module is selected

-n

only dump the module headers if the entire module is selected

-o <filename>

write to the specified file.

-a <filename>

like -outfile but append instead of overwrite