added PDK_VARIENT variable
diff --git a/Makefile b/Makefile
index e787f93..7072c14 100644
--- a/Makefile
+++ b/Makefile
@@ -28,6 +28,9 @@
# Install lite version of caravel, (1): caravel-lite, (0): caravel
CARAVEL_LITE?=1
+# PDK switch varient
+export PDK_VARIENT?=sky130B
+
MPW_TAG ?= mpw-5c
ifeq ($(CARAVEL_LITE),1)
@@ -83,6 +86,7 @@
-e CARAVEL_ROOT=${CARAVEL_ROOT} \
-e TOOLS=/opt/riscv32i \
-e DESIGNS=$(TARGET_PATH) \
+ -e PDK_VARIENT=$(PDK_VARIENT) \
-e CORE_VERILOG_PATH=$(TARGET_PATH)/mgmt_core_wrapper/verilog \
-e GCC_PREFIX=riscv32-unknown-elf \
-e MCW_ROOT=$(MCW_ROOT) \
diff --git a/openlane/user_proj_example/config.tcl b/openlane/user_proj_example/config.tcl
index c9266ee..ca5feba 100755
--- a/openlane/user_proj_example/config.tcl
+++ b/openlane/user_proj_example/config.tcl
@@ -13,7 +13,7 @@
# limitations under the License.
# SPDX-License-Identifier: Apache-2.0
-set ::env(PDK) "sky130A"
+set ::env(PDK) $::env(PDK_VARIENT)
set ::env(STD_CELL_LIBRARY) "sky130_fd_sc_hd"
set script_dir [file dirname [file normalize [info script]]]
diff --git a/openlane/user_project_wrapper/config.tcl b/openlane/user_project_wrapper/config.tcl
index f720e39..6c723b4 100755
--- a/openlane/user_project_wrapper/config.tcl
+++ b/openlane/user_project_wrapper/config.tcl
@@ -16,7 +16,7 @@
# Base Configurations. Don't Touch
# section begin
-set ::env(PDK) "sky130A"
+set ::env(PDK) $::env(PDK_VARIENT)
set ::env(STD_CELL_LIBRARY) "sky130_fd_sc_hd"
# YOU ARE NOT ALLOWED TO CHANGE ANY VARIABLES DEFINED IN THE FIXED WRAPPER CFGS
