Hi, does OpenLane only harden with sky130_fd_sc_hd cells, or can sky130_fd_sc_lp cells also be used? In the makefile I see the option of setting the library: export STD_CELL_LIBRARY ?= sky130_fd_sc_hd https://github.com/The-OpenROAD-Project/OpenLane/blob/master/Makefile#L72 But the make pdk installation doesn’t seem to install sky130_fd_sc_lp in the ../OpenLane/pdks/sky130B/libs.tech/openlane

@User Other libraries should be supported. Do you

export STD_CELL_LIBRARY=sky130_fd_sc_lp

before

make pdk

?

Thanks @User, I can try exporting STD_CELL_LIBRARY before calling make pdk. I had used: FULL_PDK=1 make pdk as suggested in the OpenLane readme: https://github.com/The-OpenROAD-Project/OpenLane/blob/master/README.md

Yeah, I don't think that's implemented in caravel yet.

Oh so even if OpenLane can use lp cells, caravel won’t be able to use them?

What I meant was that the caravel Makefile doesn't appear to support FULL_PDK with

make pdk

. You should be able to replace the default STD_CELL_LIB though.

@User do you know how we could generate the config.tcl or tracks.info files that openlane would need, but now for the lp standard cells?

Probably not much help, but I image you'd

set ::env(STD_CELL_LIBRARY) "sky130_fd_sc_lp"

in the config.tcl file. I couldn't find any info on the tracks.info file. Hopefully, that will be automatically pulled from the PDK.

We actually tried comparing the config.tcl between the hs and ls libraries, and it appears that besides name changes across many params, two numerical values (like caps) also change…

If you're generating the libraries using

make pdk

from the

caravel_user_project

repo (actually executes the

Makefile

in the

caravel

subdirectory), I believe only the

STD_CELL_LIBRARY

(and libraries necessary for caravel/caravan) will be created. Set

export STD_CELL_LIBRARY=sky130_fd_sc_lp

before

make pdk

. Or you could patch the

caravel/Makefile

by adding these lines from the

Makefile

of the

openlane

repo to make all the libraries at once.

.PHONY: full-pdk
full-pdk: skywater-pdk all-skywater-libraries open_pdks build-pdk gen-sources

.PHONY: all-skywater-libraries
all-skywater-libraries: skywater-pdk
        cd $(PDK_ROOT)/skywater-pdk && \
                git submodule update --init libraries/sky130_fd_sc_hd/latest && \
                git submodule update --init libraries/sky130_fd_sc_hs/latest && \
                git submodule update --init libraries/sky130_fd_sc_hdll/latest && \
                git submodule update --init libraries/sky130_fd_sc_ms/latest && \
                git submodule update --init libraries/sky130_fd_sc_ls/latest && \
                git submodule update --init libraries/sky130_fd_sc_hvl/latest && \
                git submodule update --init libraries/sky130_fd_io/latest && \
                $(MAKE) timing

Note, I've removed the multi-threading timing creation, so this may take several hours.