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Does anyone knows why the precheck ceases abruptly...
# shuttle-precheck
b
Does anyone knows why the precheck ceases abruptly?
👀 1
m
Can you take a look at 
precheck_results/*/logs/kayout_feol*log
?
r
I mainly got this error on gf180mpw0 project, few times in MPW7 project. But now I pass precheck both in MPW7 and MPW8 project. I don't know why. Online check also fail in gf180.
Can anybody review the log that got exception online?
b
*ERROR*: Unable to open file: /work/stu/yzhu/mpw_precheck/checks/tech-files/sky130B_mr.drc (errno=2)
@Mitch Bailey
actually, I pulled the latest precheck repo
I run precheck again, and also meet the same problem, so how do you handle it? @Ruige Lee
r
I don't know, I am waiting for someone to help me out.@proppy @jeffdi
d
DRC file should pointing sky130A_mr.drc not sky130B_mr.drc 
mpw_precheck/checks/tech-files/sky130A_mr.drc
What is your $PDK configured ? It should sky130A not sky130B
r
Mine is gf180mcuc😝
d
mpw_precheck repo has both sky130A and gf180 drc file and does not include sky130B
Copy code
dinesha@lenovo-i3-10100-07IMB05:~/workarea/efabless/open_mpw_precheck$ ls -lrt checks/tech-files/
total 304
-rw-r--r-- 1 dinesha pyfive    626 Oct  5  2021 LICENSE
-rw-r--r-- 1 dinesha pyfive  33717 Nov 15 10:54 sky130A_mr.drc
-rw-r--r-- 1 dinesha pyfive   3721 Nov 15 10:54 sky130A.magicrc
-rw-r--r-- 1 dinesha pyfive 265669 Nov 15 10:54 gf180mcuC_mr.drc
b
but in mpw7, we use sky130B
d
No, @jeffdi ask us to move to sky130A for MPW-7 project.
b
but that means we have to harden our design aigin
d
I feel better to re-harden it. They were saying some timing releated difference between sky130A and sky130B
Here is partial mail thread: to asking us to use sky130A for MPW-7. Jeff jeffdi@efabless.com via googlegroups.com Tue, Nov 8, 10:14 AM to skywater-pdk-announce Hello everyone, Apologies for missing the communication last week. Please see updates for this week. Caravel Redesign After reviewing the parasitic estimates for the sky130B process with Reram, we’ve decided more work is required to ensure we have proper timing signoff for the B version of Caravel. That said, we are planning to move forward with the current Caravel Design based on sky130A for MPW-6 and MPW-7. We will split the wafer lot to process a subset of the wafers separately for Reram layers.
b
OK I got it
r
So, why I got same error in gf180mcuc? And got exception online? There must be something wrong.
m
@Ruige Lee didn’t your log file show out of memory?
r
No. I also failed at online precheck. How can that out of memory?
That' s all the log
23_NOV_2022___07_31_48.zip
m
Online precheck uses finite memory EWS. Looks like it quit at about 78GB. @jeffdi How much memory do the precheck machines have?
r
@Mitch Bailey I open the online backend and check the log, it ends about 32GB. So the precheck of GF180 should be limited memory usage?
m
Not sure. Let’s wait for Jeff’s response. (It’s Thanksgiving, though).
m
The 32GB issue is known and being worked on
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