need details of using sta in yosys

[Vinayakamk]

hello,
i want to do timing analysis in sta of yosys,,and wants to read sdc file in sta .

so need the little bit explaination how can i do that as i felt less info in manual. what are options and selection in this cmd
sta [options] [selection]

i tried this.
yosys> sta
but wants to read sdc file
expecting like yosys> sta -read_sdc my_constraints.sdc

[whitequark]

Yosys does not currently support SDC timing constraints for STA.