diff --git a/tools/binman/btool/openssl.py b/tools/binman/btool/openssl.py
index adf90ed598..ac1eaf5ded 100644
--- a/tools/binman/btool/openssl.py
+++ b/tools/binman/btool/openssl.py
@@ -238,7 +238,7 @@ emailAddress           = {req_dist_name_dict['emailAddress']}
                   imagesize_sbl, hashval_sbl, load_addr_sysfw, imagesize_sysfw,
                   hashval_sysfw, load_addr_sysfw_data, imagesize_sysfw_data,
                   hashval_sysfw_data, sysfw_inner_cert_ext_boot_block,
-                  dm_data_ext_boot_block):
+                  dm_data_ext_boot_block, bootcore_opts):
         """Create a certificate
 
         Args:
@@ -254,6 +254,7 @@ emailAddress           = {req_dist_name_dict['emailAddress']}
             bootcore (int): Booting core
             load_addr (int): Load address of image
             sha (int): Hash function
+            bootcore_opts (int): Boot core option (split/lockstep mode)
 
         Returns:
             str: Tool output
@@ -298,7 +299,7 @@ sysfw_data=SEQUENCE:sysfw_data
 [sbl]
 compType = INTEGER:1
 bootCore = INTEGER:16
-compOpts = INTEGER:0
+compOpts = INTEGER:{bootcore_opts}
 destAddr = FORMAT:HEX,OCT:{load_addr:08x}
 compSize = INTEGER:{imagesize_sbl}
 shaType  = OID:{sha_type}
diff --git a/tools/binman/etype/x509_cert.py b/tools/binman/etype/x509_cert.py
index 9e1cf47902..cd240559e5 100644
--- a/tools/binman/etype/x509_cert.py
+++ b/tools/binman/etype/x509_cert.py
@@ -137,7 +137,8 @@ class Entry_x509_cert(Entry_collection):
                 imagesize_sysfw_data=self.imagesize_sysfw_data,
                 hashval_sysfw_data=self.hashval_sysfw_data,
                 sysfw_inner_cert_ext_boot_block=self.sysfw_inner_cert_ext_boot_block,
-                dm_data_ext_boot_block=self.dm_data_ext_boot_block
+                dm_data_ext_boot_block=self.dm_data_ext_boot_block,
+                bootcore_opts=self.bootcore_opts
             )
         if stdout is not None:
             data = tools.read_file(output_fname)