diff --git a/contrib/variant/create_coreboot_config.sh b/contrib/variant/create_coreboot_config.sh
index 9846fa2..d8ec54a 100755
--- a/contrib/variant/create_coreboot_config.sh
+++ b/contrib/variant/create_coreboot_config.sh
@@ -31,7 +31,6 @@
 # This is the name of the variant that is being cloned.
 VARIANT="${3,,}"
 # We need all uppercase version, too, so ${var^^}
-BASE_UPPER="${BASE^^}"
 REFERENCE_UPPER="${REFERENCE^^}"
 VARIANT_UPPER="${VARIANT^^}"
 
@@ -39,7 +38,9 @@
 BUG=${4:-None}
 
 # Work in third_party/chromiumos-overlay/sys-boot/coreboot/files/configs
-cd ~/trunk/src/third_party/chromiumos-overlay/sys-boot/coreboot/files/configs || exit 1
+# unless CB_CONFIG_DIR is set, in which case work in that dir
+DEFAULT_CB_CONFIG_DIR="third_party/chromiumos-overlay/sys-boot/coreboot/files/configs"
+cd "${HOME}/trunk/src/${CB_CONFIG_DIR:-${DEFAULT_CB_CONFIG_DIR}}" || exit 1
 
 # Make sure the variant doesn't already exist.
 if [[ -e "config.${VARIANT}" ]]; then
diff --git a/contrib/variant/hatch.py b/contrib/variant/hatch.py
index feb1228..1d9bb36 100644
--- a/contrib/variant/hatch.py
+++ b/contrib/variant/hatch.py
@@ -31,6 +31,12 @@
     step_names.CQ_DEPEND,
     step_names.CLEAN_UP]
 
+# Base directory for coreboot
+coreboot_dir = 'third_party/coreboot'
+
+# Base directory for coreboot configs (None=use default)
+cb_config_dir = None
+
 # Package name for FSP
 fsp = 'intel-cmlfsp'
 
diff --git a/contrib/variant/new_variant.py b/contrib/variant/new_variant.py
index 15bb4a4..084d2df 100755
--- a/contrib/variant/new_variant.py
+++ b/contrib/variant/new_variant.py
@@ -212,6 +212,11 @@
     * base - the name of the base board, such as Hatch, Volteer, or Zork.
         This can be different from the reference board, e.g. the Trembyle
         reference board in the Zork project.
+    * coreboot_dir - base directory for coreboot, usually third_party/coreboot
+        but could differ for processors that use a private repo
+    * cb_config_dir - base directory for coreboot configs, usually
+        third_party/chromiumos-overlay/sys-boot/coreboot/files/configs but
+        could differ for processors that use a private repo
     * step_list - list of steps (named in step_names.py) to run in sequence
         to create the new variant of the reference board
     * fsp - package name for FSP. This may be None, depending on the
@@ -277,6 +282,8 @@
         # pylint: disable=bad-whitespace
         # Allow extra spaces around = so that we can line things up nicely
         status.base                 = module.base
+        status.coreboot_dir         = module.coreboot_dir
+        status.cb_config_dir        = module.cb_config_dir
         status.emerge_cmd           = module.emerge_cmd
         status.emerge_pkgs          = module.emerge_pkgs
         status.fitimage_dir         = module.fitimage_dir
@@ -428,7 +435,8 @@
     """
     logging.info('Running step create_coreboot_variant')
     create_coreboot_variant_sh = os.path.join(
-        os.path.expanduser('~/trunk/src/third_party/coreboot'),
+        os.path.expanduser('~/trunk/src/'),
+        status.coreboot_dir,
         'util/mainboard/google/create_coreboot_variant.sh')
     return bool(run_process(
         [create_coreboot_variant_sh,
@@ -450,6 +458,9 @@
         True if the script and test build succeeded, False if something failed
     """
     logging.info('Running step create_coreboot_config')
+    environ = os.environ.copy()
+    if status.cb_config_dir is not None:
+        environ['CB_CONFIG_DIR'] = status.cb_config_dir
     create_coreboot_config_sh = os.path.expanduser(
         '~/trunk/src/platform/dev/contrib/variant/create_coreboot_config.sh')
     return bool(run_process(
@@ -457,7 +468,7 @@
         status.base,
         status.board,
         status.variant,
-        status.bug]))
+        status.bug], env=environ))
 
 
 def copy_coreboot_config(status):
diff --git a/contrib/variant/trembyle.py b/contrib/variant/trembyle.py
index 0a81d02..31fc24f 100644
--- a/contrib/variant/trembyle.py
+++ b/contrib/variant/trembyle.py
@@ -29,6 +29,12 @@
     step_names.CQ_DEPEND,
     step_names.CLEAN_UP]
 
+# Base directory for coreboot
+coreboot_dir = 'third_party/coreboot'
+
+# Base directory for coreboot configs (None=use default)
+cb_config_dir = None
+
 # Package name for FSP
 fsp = None
 
diff --git a/contrib/variant/volteer.py b/contrib/variant/volteer.py
index 76217fe..29fa728 100644
--- a/contrib/variant/volteer.py
+++ b/contrib/variant/volteer.py
@@ -16,8 +16,7 @@
 # the new variant of the baseboard
 step_list = [
     step_names.CB_VARIANT,
-    # TODO(b/147483696)
-    # step_names.CB_CONFIG,
+    step_names.CB_CONFIG,
     step_names.ADD_FIT,
     step_names.GEN_FIT,
     step_names.COMMIT_FIT,
@@ -32,6 +31,12 @@
     step_names.CQ_DEPEND,
     step_names.CLEAN_UP]
 
+# Base directory for coreboot
+coreboot_dir = 'third_party/coreboot-intel-private/jsl-tgl'
+
+# Base directory for coreboot configs (None=use default)
+cb_config_dir = 'private-overlays/chipset-tgl-private/sys-boot/coreboot/files/configs'
+
 # Package name for FSP
 fsp = 'intel-tglfsp'