Remove OpenLane variables that are not used by the flow
diff --git a/sky130/openlane/config.tcl b/sky130/openlane/config.tcl
index bcc0e57..0873fe1 100755
--- a/sky130/openlane/config.tcl
+++ b/sky130/openlane/config.tcl
@@ -100,10 +100,7 @@
# netgen setup
set ::env(NETGEN_SETUP_FILE) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/netgen/TECHNAME_setup.tcl"
# CTS luts
-set ::env(CTS_TECH_DIR) "N/A"
-set ::env(CTS_SQR_CAP) 0.258e-3
-set ::env(CTS_SQR_RES) 0.125
set ::env(FP_TAPCELL_DIST) 13
# Tracks info
diff --git a/sky130/openlane/sky130_fd_sc_hd/config.tcl b/sky130/openlane/sky130_fd_sc_hd/config.tcl
index 24f6a86..681e880 100755
--- a/sky130/openlane/sky130_fd_sc_hd/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hd/config.tcl
@@ -62,9 +62,6 @@
# Clk Buffers info CTS data
set ::env(ROOT_CLK_BUFFER) sky130_fd_sc_hd__clkbuf_16
-set ::env(CLK_BUFFER) sky130_fd_sc_hd__clkbuf_4
-set ::env(CLK_BUFFER_INPUT) A
-set ::env(CLK_BUFFER_OUTPUT) X
set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hd__clkbuf_8 sky130_fd_sc_hd__clkbuf_4 sky130_fd_sc_hd__clkbuf_2"
set ::env(FP_PDN_RAIL_WIDTH) 0.48
# Determined from https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hd/blob/ac7fb61f06e6470b94e8afdf7c25268f62fbd7b1/cells/clkbuf/sky130_fd_sc_hd__clkbuf_16__tt_025C_1v80.lib.json
diff --git a/sky130/openlane/sky130_fd_sc_hdll/config.tcl b/sky130/openlane/sky130_fd_sc_hdll/config.tcl
index 005f4ec..46b08f8 100755
--- a/sky130/openlane/sky130_fd_sc_hdll/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hdll/config.tcl
@@ -59,9 +59,6 @@
# Clk Buffers info CTS data
set ::env(ROOT_CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_16
-set ::env(CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_4
-set ::env(CLK_BUFFER_INPUT) A
-set ::env(CLK_BUFFER_OUTPUT) X
set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hdll__clkbuf_8 sky130_fd_sc_hdll__clkbuf_4 sky130_fd_sc_hdll__clkbuf_2"
set ::env(FP_PDN_RAIL_WIDTH) 0.48
# Determined from https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hdll/blob/0694bd23893de20f5233ef024acf6cca1e750ac6/cells/clkbuf/sky130_fd_sc_hdll__clkbuf_16__tt_025C_1v80.lib.json
diff --git a/sky130/openlane/sky130_fd_sc_hs/config.tcl b/sky130/openlane/sky130_fd_sc_hs/config.tcl
index 0468817..2bd804c 100755
--- a/sky130/openlane/sky130_fd_sc_hs/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hs/config.tcl
@@ -59,9 +59,6 @@
set ::env(CELL_PAD_EXCLUDE) "sky130_fd_sc_hs__tap* sky130_fd_sc_hs__decap* sky130_fd_sc_hs__fill*"
set ::env(ROOT_CLK_BUFFER) sky130_fd_sc_hs__clkbuf_16
-set ::env(CLK_BUFFER) sky130_fd_sc_hs__clkbuf_4
-set ::env(CLK_BUFFER_INPUT) A
-set ::env(CLK_BUFFER_OUTPUT) X
set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hs__clkbuf_8 sky130_fd_sc_hs__clkbuf_4 sky130_fd_sc_hs__clkbuf_2"
set ::env(CTS_MAX_CAP) 1.8894300000
set ::env(MAX_TRANSITION_CONSTRAINT) 0.75
diff --git a/sky130/openlane/sky130_fd_sc_hvl/config.tcl b/sky130/openlane/sky130_fd_sc_hvl/config.tcl
index 044ebfd..350a1e7 100644
--- a/sky130/openlane/sky130_fd_sc_hvl/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hvl/config.tcl
@@ -65,9 +65,6 @@
# Clk Buffers info CTS data
set ::env(ROOT_CLK_BUFFER) sky130_fd_sc_hvl__buf_16
-set ::env(CLK_BUFFER) sky130_fd_sc_hvl__buf_4
-set ::env(CLK_BUFFER_INPUT) A
-set ::env(CLK_BUFFER_OUTPUT) X
set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hvl__buf_8 sky130_fd_sc_hvl__buf_4 sky130_fd_sc_hvl__buf_2"
set ::env(CTS_MAX_CAP) 5.57100
set ::env(MAX_TRANSITION_CONSTRAINT) 0.75
diff --git a/sky130/openlane/sky130_fd_sc_ls/config.tcl b/sky130/openlane/sky130_fd_sc_ls/config.tcl
index de0c19a..7f07b42 100755
--- a/sky130/openlane/sky130_fd_sc_ls/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_ls/config.tcl
@@ -62,9 +62,6 @@
# Clk Buffers info CTS data
set ::env(ROOT_CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_16
-set ::env(CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_4
-set ::env(CLK_BUFFER_INPUT) A
-set ::env(CLK_BUFFER_OUTPUT) X
set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_ls__clkbuf_8 sky130_fd_sc_ls__clkbuf_4 sky130_fd_sc_ls__clkbuf_2"
set ::env(CTS_MAX_CAP) 1.53169
set ::env(MAX_TRANSITION_CONSTRAINT) 0.75
diff --git a/sky130/openlane/sky130_fd_sc_ms/config.tcl b/sky130/openlane/sky130_fd_sc_ms/config.tcl
index c6bc90b..40d3e16 100755
--- a/sky130/openlane/sky130_fd_sc_ms/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_ms/config.tcl
@@ -61,9 +61,6 @@
# Clk Buffers info CTS data
set ::env(ROOT_CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_16
-set ::env(CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_4
-set ::env(CLK_BUFFER_INPUT) A
-set ::env(CLK_BUFFER_OUTPUT) X
set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_ms__clkbuf_8 sky130_fd_sc_ms__clkbuf_4 sky130_fd_sc_ms__clkbuf_2"
set ::env(CTS_MAX_CAP) 1.53169
set ::env(MAX_TRANSITION_CONSTRAINT) 0.75
diff --git a/sky130/openlane/sky130_osu_sc_t18/config.tcl b/sky130/openlane/sky130_osu_sc_t18/config.tcl
index 2aa5a05..cab3c72 100755
--- a/sky130/openlane/sky130_osu_sc_t18/config.tcl
+++ b/sky130/openlane/sky130_osu_sc_t18/config.tcl
@@ -62,13 +62,8 @@
# Clk Buffers info CTS data
set ::env(ROOT_CLK_BUFFER) CLKBUFX1
-set ::env(CLK_BUFFER) CLKBUFX1
-set ::env(CLK_BUFFER_INPUT) A
-set ::env(CLK_BUFFER_OUTPUT) Y
set ::env(CTS_CLK_BUFFER_LIST) "CLKBUFX1"
# TODO...
-set ::env(CTS_SQR_CAP) 0.258e-3
-set ::env(CTS_SQR_RES) 0.125
set ::env(CTS_MAX_CAP) 1.53169
set ::env(FP_PDN_RAIL_WIDTH) 0.48
