diff --git a/compatibility_matrices/Android.bp b/compatibility_matrices/Android.bp
index 712f28a..b3ca293 100644
--- a/compatibility_matrices/Android.bp
+++ b/compatibility_matrices/Android.bp
@@ -31,7 +31,6 @@
         "kernel_config_q_4.14",
         "kernel_config_q_4.19",
     ],
-    core_hals: "only",
 }
 
 vintf_compatibility_matrix {
@@ -45,7 +44,6 @@
         "kernel_config_r_4.19",
         "kernel_config_r_5.4",
     ],
-    core_hals: "only",
 }
 
 vintf_compatibility_matrix {
@@ -59,7 +57,6 @@
         "kernel_config_s_5.4",
         "kernel_config_s_5.10",
     ],
-    core_hals: "only",
 }
 
 vintf_compatibility_matrix {
@@ -72,7 +69,6 @@
         "kernel_config_t_5.10",
         "kernel_config_t_5.15",
     ],
-    core_hals: "only",
 }
 
 vintf_compatibility_matrix {
@@ -85,7 +81,6 @@
         "kernel_config_u_5.15",
         "kernel_config_u_6.1",
     ],
-    core_hals: "only",
 }
 
 vintf_compatibility_matrix {
@@ -98,5 +93,4 @@
         "kernel_config_v_5.15",
         "kernel_config_v_6.1",
     ],
-    core_hals: "only",
 }
diff --git a/compatibility_matrices/build/vintf_compatibility_matrix.go b/compatibility_matrices/build/vintf_compatibility_matrix.go
index 4f342b2..c72cbde 100644
--- a/compatibility_matrices/build/vintf_compatibility_matrix.go
+++ b/compatibility_matrices/build/vintf_compatibility_matrix.go
@@ -35,10 +35,10 @@
 	pctx = android.NewPackageContext("android/vintf")
 
 	assembleVintfRule = pctx.AndroidStaticRule("assemble_vintf", blueprint.RuleParams{
-		Command:     `${assembleVintfCmd} -i ${inputs} -o ${out} ${extraParams}`,
+		Command:     `${assembleVintfCmd} -i ${inputs} -o ${out}`,
 		CommandDeps: []string{"${assembleVintfCmd}"},
 		Description: "assemble_vintf -i ${inputs}",
-	}, "inputs", "extraParams")
+	}, "inputs")
 
 	xmllintXsd = pctx.AndroidStaticRule("xmllint-xsd", blueprint.RuleParams{
 		Command:     `$XmlLintCmd --quiet --schema $xsd $in > /dev/null && touch -a $out`,
@@ -64,13 +64,6 @@
 
 	// list of kernel_config modules to be combined to final output
 	Kernel_configs []string
-
-	// Default is "default" for compatibility matrices on /vendor
-	// and /odm, and "disallow" for compatibility matrices on /system,
-	// /product, and /system_ext.
-	// If value is "only", only android.* HALs are allowed. If value
-	// is "disallow", none of android.* HALs are allowed.
-	Core_hals *string
 }
 
 type vintfCompatibilityMatrixRule struct {
@@ -173,8 +166,7 @@
 		Implicits:   inputPaths,
 		Output:      g.genFile,
 		Args: map[string]string{
-			"inputs":      strings.Join(inputPaths.Strings(), ":"),
-			"extraParams": strings.Join(g.getExtraParams(), " "),
+			"inputs": strings.Join(inputPaths.Strings(), ":"),
 		},
 	})
 	g.generateValidateBuildAction(ctx, g.genFile, schema.Path())
@@ -199,23 +191,3 @@
 		},
 	}
 }
-
-// Return extra parameters to assemble_vintf.
-func (g *vintfCompatibilityMatrixRule) getExtraParams() []string {
-	var extraParams []string
-
-	coreHalsStrategy := proptools.StringDefault(
-		g.properties.Core_hals,
-		g.defaultCoreHalsStrategy(),
-	)
-	extraParams = append(extraParams, "--core-hals", proptools.ShellEscape(coreHalsStrategy))
-	return extraParams
-}
-
-func (g *vintfCompatibilityMatrixRule) defaultCoreHalsStrategy() string {
-	// TODO(b/290408770): default to "disallow" for FCMs
-
-	// For Device (vendor, odm) compatibility matrix, default is
-	// to not check anything.
-	return "default"
-}