Numerous bug fixes, ending in clean full LVS for both caravel and caravan.

[RTimothyEdwards]

(1) Modified the .magicrc file to set a default for PDK if not set in
environment. (2) Fixed the user ID programming layout to not leave holes
behind when the script moves the vias around (similar to the handling of
the GPIO defaults block). (3) Added substrate isolation to gpio_control_block
and fixed the path references to the standard cells. (4) Fixed the four
missing routes on the Caravan top level. (5) Reinstated the large rendered
labels for the pads on both caravel and caravan. (6) Corrected the top
level gate-level netlist for caravan to add the missing pins to the
management core wrapper. (7) Did the same for the caravan top level RTL.
(8) Created scripts to run full LVS including extracting the management
core wrapper and reading all gate-level verilog submodules. (9) Moved all
of the LVS scripts to the scripts directory.

[RTimothyEdwards]

@d-m-bailey : I'd appreciate it if you could review these changes, especially around the user ID programming block.
Attn: @jeffdi

[d-m-bailey]

Things you might want to take a look at.

1. In the scripts/run_carav*_lvs_full.sh files, the readnet verilog lines are all relative paths. Maybe $CARAVEL_ROOT and $MCW_ROOT would be better. I believe the management core is installed as mcw_core_wrapper by default, but the scripts reference caravel_mgmt_soc_litex.

2. The changes to scripts/set_user_id.py have not been included, so that will crash.

[d-m-bailey]

3 ) simple_por still uses a common ground. See #31

[RTimothyEdwards]

@jeffdi , @d-m-bailey : I don't get why scripts/set_user_id.py is not changed. That was in pull request #73, which was stated to have been merged 12 hours ago. But I pulled the latest main branch and it's unchanged there. What happened?

[RTimothyEdwards]

@jeffdi : Did pull request #73 get blocked by failing the CI or something? That's what's suggested in the Actions tab. That's the only explanation I can come up with. But I don't know why github claims that #73 was merged because clearly it wasn't. It needs to be merged before this pull request can be merged.

[RTimothyEdwards]

@d-m-bailey : I understand that the scripts are somewhat ad hoc, but my main goal was to get both projects to show LVS clean, and then move the scripts to the scripts/ directory so that they can be standardized and made more universally useful. I can raise a separate issue to get them cleaned up, preferably with a hook to the Makefile so that one can do something like "make lvs-full" to initiate a complete LVS.

The simple POR fix is a separate issue, although since I can do the fix in probably an hour, max, it is well worth considering getting that done for this MPW.

[d-m-bailey]

@RTimothyEdwards Haven't completed LVS yet, but these are the temporary changes I made to simple_por (for reference).

[d-m-bailey]

@RTimothyEdwards I had a problem trying to create a pull request where it didn't appear that the previous updates were included. Finally, this is what I did. mpw5-set-user-id is my local branch.

git checkout -b efabless-main mpw5-set-user-id
git pull https://github.com/efabless/caravel.git main
<fix conflicts>
git checkout mpw5-set-user-id
git merge --no-ff efabless-main
git push origin mpw5-set-user-id

[RTimothyEdwards]

@d-m-bailey :
(1) Add the comments about the simple_por to issue #31
(2) Please direct comments about merging to @jeffdi , as I do not have authority to do a merge myself.

[RTimothyEdwards]

@d-m-bailey : Rather than try to get Jeff to work through the merge issues, I'm just going to make the changes from PR #73 in this PR so Jeff should only need to do the one merge.

[d-m-bailey]

@RTimothyEdwards the merge suggestions weren't for Jeff, but for your local repo.
This is how I think it works.
You created the all_lvs_clean branch from main.
After that, the main github branch was updated and you pulled changes, but all_lvs_clean does not get updated it that case. I think you need to git merge --no-ff.

[RTimothyEdwards]

@d-m-bailey : I am not well versed in any of the more obscure git options. Anyway, I see your point, but on my laptop I had pulled the main branch and I was still not seeing the changes from your PR #73. Anyway, I have merged those changes into this pull request, so they should get properly merged into main as soon as Jeff has the free time to do it.

[antonblanchard]

Hi @RTimothyEdwards, the removal of -v $(PWD)/..:$(PWD)/.. broke tape outs for me, was that change intentional?

diff --git a/openlane/Makefile b/openlane/Makefile
index 8fd607d..ca6b7ed 100644
--- a/openlane/Makefile
+++ b/openlane/Makefile
@@ -44,8 +44,9 @@ endif
        @if [ -f ./$*/interactive.tcl ]; then\
                docker run --rm -v $(OPENLANE_ROOT):/openlane \
                -v $(PDK_ROOT):$(PDK_ROOT) \
-               -v $(PWD)/..:$(PWD)/.. \
+               -v $(MCW_ROOT):$(MCW_ROOT) \
                -v $(CARAVEL_ROOT):$(CARAVEL_ROOT) \
+               -e MCW_ROOT=$(MCW_ROOT) \
                -e PDK_ROOT=$(PDK_ROOT) \
                -e CARAVEL_ROOT=$(CARAVEL_ROOT) \
                -e PDK=$(PDK) \
@@ -56,8 +57,9 @@ endif
        else\
                docker run --rm -v $(OPENLANE_ROOT):/openlane \
                -v $(PDK_ROOT):$(PDK_ROOT) \
-               -v $(PWD)/..:$(PWD)/.. \
                -v $(CARAVEL_ROOT):$(CARAVEL_ROOT) \
+               -v $(MCW_ROOT):$(MCW_ROOT) \
+               -e MCW_ROOT=$(MCW_ROOT) \
                -e PDK=$(PDK) \
                -e PDK_ROOT=$(PDK_ROOT) \
                -e CARAVEL_ROOT=$(CARAVEL_ROOT) \