ci(gds): update build process for IHP

.github/config/openlane.txt

@@ -1,2 +1 @@
-OPENLANE_TAG=2.0.7
-SKY130_PDK_VERSION=6d4d11780c40b20ee63cc98e645307a9bf2b2ab8
+OPENLANE_TAG=tt

.github/workflows/gds.yaml

@@ -15,8 +15,9 @@ jobs:
   gds:
     env:
       PYTHONIOENCODING: utf-8
-      PDK_ROOT: ${{ github.workspace }}/pdk
-      TT_CONFIG: sky130.yaml
+      PDK: ihp-sg13g2
+      PDK_ROOT: ${{ github.workspace }}/IHP-Open-PDK
+      TT_CONFIG: ihp-sg13g2.yaml
       # Uncomment the following line to build only the specified projects:
       #TT_ONLY_PROJECTS: tt_um_chip_rom,tt_um_factory_test
 
@@ -33,15 +34,10 @@ jobs:
       - name: Checkout OpenLane 2 repo
         uses: actions/checkout@v4
         with:
-          repository: efabless/openlane2
+          repository: smunaut/openlane2
           path: openlane2
           ref: ${{ env.OPENLANE_TAG }}
 
-      - name: Patch OpenLane 2 repo
-        working-directory: openlane2
-        run:
-          git apply --allow-empty ../patches/openlane2.patch
-
       - name: setup python
         uses: actions/setup-python@v5
         with:
@@ -60,13 +56,6 @@ jobs:
           extraPullNames: ${{ vars.CACHIX_CACHE_EXTRA || 'openlane' }}
           authToken: ${{ secrets.CACHIX_TOKEN }}
 
-      - name: Install Sky130 PDK
-        uses: TinyTapeout/volare-action@v2
-        with:
-          pdk_name: sky130
-          pdk_version: ${{ env.SKY130_PDK_VERSION }}
-          pdk_root: ${{ env.PDK_ROOT }}
-
       # run OpenLane to build the GDS
       - name: Harden Chip ROM
         run: nix-shell $GITHUB_WORKSPACE/openlane2/shell.nix --run "python -m openlane tt/rom/config.json"
@@ -89,7 +78,7 @@ jobs:
       - name: Copy final results
         run: python ./tt/configure.py --copy-final-results
 
-      - name: Create eFabless submission
+      - name: Create IHP submission
         run: python ./tt/configure.py --create-efabless-submission
 
       - name: upload GDS artifact
@@ -118,10 +107,10 @@ jobs:
           name: shuttle_index
           path: shuttle_index.json
 
-      - name: upload Efabless submission directory
+      - name: upload IHP submission directory
         uses: actions/upload-artifact@v4
         with:
-          name: efabless_submission
+          name: ihp_submission
           path: efabless
 
       # Install iverilog, cocotb (required for GL test)

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "tt"]
 	path = tt
 	url = https://github.com/TinyTapeout/tt-support-tools
+[submodule "IHP-Open-PDK"]
+	path = IHP-Open-PDK
+	url = https://github.com/TinyTapeout/IHP-Open-PDK

BUILDING.md

@@ -1,13 +1,9 @@
-# Build Tiny Tapeout with Open Lane 2
+# Build Tiny Tapeout with OpenLane 2
 
 ## Environment setup
 
 ```bash
 export OPENLANE2_ROOT=~/openlane2
-export SKY130_PDK_VERSION=6d4d11780c40b20ee63cc98e645307a9bf2b2ab8
-
-pip3 install volare
-volare enable --pdk sky130 $SKY130_PDK_VERSION
 ```
 
 Then install OpenLane 2 with Nix, as explained [here](https://openlane2.readthedocs.io/en/latest/getting_started/nix_installation/index.html), taking care of the following:
@@ -16,8 +12,6 @@ Then install OpenLane 2 with Nix, as explained [here](https://openlane2.readthed
 
 2. Clone OpenLane 2 to ~/openlane2 (or change the value of the `OPENLANE2_ROOT` environment variable).
 
-3. Apply patches to OpenLane 2: `git -C $OPENLANE2_ROOT apply $PWD/patches/openlane2.patch`
-
 ## Repository setup
 
 First, make sure that you have checked out the submodules: