Hi I have no drc violations after detailed routing then no l

Question

Hi I have no drc violations after detailed routing then no lvs violations but after that magic drc has drc violations I am also getting same magic drc violations in user proj example I cloned caravel user project anew and followed installation steps and built user proj example and I see magic drc violations in it as well THis si the sequence of steps I followed ```1302 git clone <https github com efabless caravel user project git> 1304 cd caravel user project 1305 make install 1307 mkdir PDK ROOT 1308 mkdir OPENLANE ROOT 1309 export PDK ROOT=~ caravel user project PDK ROOT 1310 export OPENLANE ROOT=~ caravel user project OPENLANE ROOT 1311 make update caravel 1312 make pdk 1313 make simenv 1314 export CARAVEL ROOT=$ pwd caravel 1315 export SIM=RTL 1317 make verify io ports 1318 make openlane 1319 make user proj example ``` Is anyone else getting magic drc violations My magic version is ```$ magic version 8 2 157``` Thanks

Hieu Bui · Answer

Which command do you use to open the project in magic

Bhawandeep Singh Harsh · Answer

Thanks I am not opening the project in magic it runs a step as part of ```make lt project gt ``` My magic version is ```$ magic version 8 2 157```

Bhawandeep Singh Harsh · Answer

I think that is the last step shown as magic netgen in the openlane flow

Hieu Bui · Answer

I think you need the latest magic to build the pdk You have to build it from source here <http opencircuitdesign com magic >

Hieu Bui · Answer

Otherwise you have to build the pdk by running ```make pdk nonnative``` However by default the docker image might not have the internet connection You have to config docker to allow the image to have the internet connection

Bhawandeep Singh Harsh · Answer

Thanks let me update magic and retry

Matt Venn · Answer

Yes you need at least magic 160 And you will probably need to wipe your pdk and build it again after installing magic

Bhawandeep Singh Harsh · Answer

Thanks magic installation is taking me down a rabbithole of dependencies Are there any instructions automation script available in openlane for magic installation Thanks

Matt Venn · Answer

The homepage for magic has some details

Matt Venn · Answer

You could try building the pdk non native then you don t need magic

Bhawandeep Singh Harsh · Answer

Thanks I am getting this error in pdk nonnative ```Your branch is up to date with origin master Already up to date make 1 Leaving directory home bhawandeepsingh Desktop darkriscv in openlane docker run rm v home bhawandeepsingh Desktop darkriscv in openlane PDK ROOT home bhawandeepsingh Desktop darkriscv in openlane PDK ROOT v user project v home bhawandeepsingh Desktop darkriscv in openlane caravel home bhawandeepsingh Desktop darkriscv in openlane caravel e CARAVEL ROOT= home bhawandeepsingh Desktop darkriscv in openlane caravel e PDK ROOT= home bhawandeepsingh Desktop darkriscv in openlane PDK ROOT u 1000 1000 efabless openlane current sh c cd home bhawandeepsingh Desktop darkriscv in openlane caravel make build pdk make gen sources docker Error response from daemon OCI runtime create failed invalid mount Destination user project Type bind Source var lib docker volumes 4301b3c91a0ea81bc278fa77113dcd90b078f8354c72fd80886c9411f9945d7e data Options rbind mount destination user project not absolute unknown make Makefile 153 pdk nonnative Error 125```

Bhawandeep Singh Harsh · Answer

Thanks any idea why it is looking for user project

Hieu Bui · Answer

You might need to edit line 153 of the Makefile to this ```pdk nonnative skywater pdk skywater library skywater timing open pdks docker run rm v $ PDK ROOT $ PDK ROOT v $ shell pwd user project v $ CARAVEL ROOT $ CARAVEL ROOT e CARAVEL ROOT=$ CARAVEL ROOT e PDK ROOT=$ PDK ROOT u $ shell id u $ USER $ shell id g $ USER efabless openlane current sh c cd $ CARAVEL ROOT make build pdk make gen sources ```

Hieu Bui · Answer

$ pwd user project gt $ shell pwd user project

Hieu Bui · Answer

Ensure that you configure docker for internet access otherwise it will not work

Hieu Bui · Answer

you can check to see if your docker has been configure for internet access by running ```docker run it v $ pwd openLANE flow v $PDK ROOT $PDK ROOT e PDK ROOT=$PDK ROOT u $ id u $USER $ id g $USER efabless openlane current``` then run ```$ ping <http google com|google com>```

Bhawandeep Singh Harsh · Answer

Thanks I got make pdk nonnative to work and after that make user proj example completed w o DRC issues let me proceed thanks

Bhawandeep Singh Harsh · Answer

Thanks < Hieu Bui> < Matt Venn> I have a question The observed behavior of my synthesis runs has changed But when I check magic version in terminal it still shows the old version Add to it that I changed pdk but openlane had no way to specify something analogous to nonnative magic will be used by openlane which probably means it might still be using the old one How can I be sure that this old version is not being used at all at any step or only one version is used for every step Thanks

Bhawandeep Singh Harsh · Answer

< Hieu Bui> Thanks a lot for your help so far quick question what version do you get if you do ```magic version ``` My runs are ending abruptly at magic related steps The error message is ``` INFO current step index 35 Magic 8 3 revision 145 Compiled on Mon Mar 22 04 21 56 UTC 2021 Starting magic under Tcl interpreter Using the terminal as the console Using NULL graphics device Processing system magicrc file Sourcing design magicrc for technology sky130A 2 Magic internal units = 1 Lambda Input style sky130 scaleFactor=2 multiplier=2 Scaled tech values by 2 1 to match internal grid scaling Loading sky130A Device Generator Menu Loading openLANE flow scripts magic maglef tcl from command line Reading LEF data from file project openlane user project wrapper runs user project wrapper results magic user project wrapper lef This action cannot be undone LEF read Processed 21978940 lines INFO DONE GENERATING MAGLEF VIEW sh line 1 8 Killed flow tcl design user project wrapper save path save tag user project wrapper overwrite make 1 Makefile 43 user project wrapper Error 137 make 1 Leaving directory home bhawandeepsingh Desktop darkriscv in openlane openlane make Makefile 71 user project wrapper Error 2```

Hieu Bui · Answer

This is my magic version used to build the pdk $ magic version 8 3 153 Would you please check if your docker image have the internet access Run this in your terminal ```$ docker run it v $ pwd openLANE flow v $PDK ROOT $PDK ROOT e PDK ROOT=$PDK ROOT u $ id u $USER $ id g $USER efabless openlane current $ magic version $ ping c 4 <http google com|google com>``` Docker run a separate system on your machine It is like a virtual machine actually Everything will be contained in that environment Magic in your machine stay the same But the magic in the docker image will be the correct version However I think make pdk nonnative would fail if it does not have internet connection

Bhawandeep Singh Harsh · Answer

Thanks if I follow your steps the 2nd command returns ```bash 4 2$ magic version 8 3 145``` The ping also returned ```bash 4 2$ ping c 4 PING 216 58 195 78 56 84 bytes of data 64 bytes from 216 58 195 78 icmp seq=1 ttl=116 time=12 3 ms 64 bytes from 216 58 195 78 icmp seq=2 ttl=116 time=12 1 ms 64 bytes from 216 58 195 78 icmp seq=3 ttl=116 time=12 1 ms 64 bytes from 216 58 195 78 icmp seq=4 ttl=116 time=12 0 ms ping statistics 4 packets transmitted 4 received 0 packet loss time 3003ms rtt min avg max mdev = 12 009 12 156 12 305 0 172 ms```

Hieu Bui · Answer

All is good How much memory do you have

Bhawandeep Singh Harsh · Answer

Thanks the laptop has 16GB RAM While running different stages ti does print the usage and peak usage ~ ```cpu time = 00 05 11 elapsed time = 00 01 18 memory = 2066 19 MB peak = 4341 46 MB ```

Hieu Bui · Answer

I am not sure why but it might be the out of memory problem In my system with 64G of ram I can finish your design upto lvs You can try with the default caravel user project example to see if there is any problem

Bhawandeep Singh Harsh · Answer

I was also reaching till LVS then I thought if layout does not match schematic it might be due to some physical design stage optimizations then tried to solve LVS problems by changing some physical design related constraints ``` set env PL RESIZER DESIGN OPTIMIZATIONS 0 set env PL RESIZER TIMING OPTIMIZATIONS 0 set env PL RESIZER BUFFER INPUT PORTS 0 set env PL RESIZER BUFFER OUTPUT PORTS 0 set env PL OPENPHYSYN OPTIMIZATIONS 0 set env DIODE INSERTION STRATEGY 0 set env FILL INSERTION 0 set env TAP DECAP INSERTION 0```

Hieu Bui · Answer

So it is the problem of the combination of your config My advice is that you keep the default config for user project wrapper and try to harden darksocv as a macro first Then in the user project wrapper you assemble it as a hard macro The user project wrapper have to met some requirements of the caravel test harness therefore modifying it would not be a good idea and it will take a lot of time to make it right You can start by using the minimum config as in the caravel user project example Try to understand the problem that you got then solve it in a smart way Copying the code on the Internet might not work This is the minimum config that the darksocv can synthesize and place amp route ```set script dir file dirname file normalize info script User config set env DESIGN NAME darksocv Change if needed set env VERILOG FILES glob $ env DESIGN DIR src v set env VERILOG FILES $script dir caravel verilog rtl defines v $script dir verilog rtl darksocv v $script dir verilog rtl darkriscv v $script dir verilog rtl darkuart v Fill this set env CLOCK PERIOD 100 set env CLOCK PORT XCLK gt Do the below from the bash shell inside docker export STD CELL LIBRARY= sky130 fd sc ls set env CLOCK NET $ env CLOCK PORT set env CLOCK NET XCLK set env CLOCK NET CLK set env CLOCK NET core0 CLK set env CLOCK NET uart0 CLK set env FP SIZING relative set env FP CORE UTIL 30 set env DESIGN IS CORE 0 set env PL TARGET DENSITY 0 5 set env PL BASIC PLACEMENT 0 set env PL ROUTABILITY DRIVEN 1 set env VDD NETS list vccd1 vccd2 vdda1 vdda2 set env GND NETS list vssd1 vssd2 vssa1 vssa2 set env RUN CVC 0``` You can try to harden it futher by using the exploration mode in Openlane You can explore the synthesis results choose the one that you think is the best for you Openlane can also sweep different design parameters and give you a report But it would take a lot of time to run slightly smiling face

Bhawandeep Singh Harsh · Answer

Thanks a lot < Matthew Guthaus> < Hieu Bui> < Matt Venn> darksocv built with a smaller memory I am working on user project wrapper now thanks a lot once again

Bhawandeep Singh Harsh · Answer

Thanks a lot < Matthew Guthaus> < Hieu Bui> < Matt Venn> user project wrapper build completed now with daorksocv macro with a smaller memory thanks a lot once again