diff --git a/pkg/asset/agent/common.go b/pkg/asset/agent/common.go
index 0a8f4a6134..b0d40f578f 100644
--- a/pkg/asset/agent/common.go
+++ b/pkg/asset/agent/common.go
@@ -34,8 +34,10 @@ type nmStateConfig struct {
 }
 
 const (
-	// ExternalPlatformNameOci is the name of the external platform for OCP.
+	// ExternalPlatformNameOci is the name of the external platform for Oracle Cloud Infrastructure.
 	ExternalPlatformNameOci = "oci"
+	// ExternalPlatformNameIBMZ is the name of the external platform for IBM Z (s390x).
+	ExternalPlatformNameIBMZ = "ibmz"
 )
 
 // SupportedInstallerPlatforms lists the supported platforms for agent installer.
diff --git a/pkg/asset/agent/image/agentimage.go b/pkg/asset/agent/image/agentimage.go
index e481492a47..59d914b5eb 100644
--- a/pkg/asset/agent/image/agentimage.go
+++ b/pkg/asset/agent/image/agentimage.go
@@ -270,9 +270,9 @@ func (a *AgentImage) PersistToFile(directory string) error {
 	if err != nil {
 		return err
 	}
-	// For external platform OCI, add CCM manifests in the openshift directory.
+	// For external platforms (OCI, IBM Z, etc.), add CCM manifests in the openshift directory.
 	if a.platform == hiveext.ExternalPlatformType {
-		logrus.Infof("When using %s oci platform, always make sure CCM manifests were added in the %s directory.", hiveext.ExternalPlatformType, manifests.OpenshiftManifestDir())
+		logrus.Infof("When using %s platform, always make sure CCM manifests were added in the %s directory.", hiveext.ExternalPlatformType, manifests.OpenshiftManifestDir())
 	}
 
 	return nil
diff --git a/pkg/asset/agent/image/kargs.go b/pkg/asset/agent/image/kargs.go
index fb82c6596f..f566d54635 100644
--- a/pkg/asset/agent/image/kargs.go
+++ b/pkg/asset/agent/image/kargs.go
@@ -39,10 +39,15 @@ func (a *Kargs) Generate(_ context.Context, dependencies asset.Parents) error {
 	switch agentWorkflow.Workflow {
 	case workflow.AgentWorkflowTypeInstall:
 		a.fips = agentClusterInstall.FIPSEnabled()
-		// Add kernel args for external oci platform
-		if agentClusterInstall.GetExternalPlatformName() == agent.ExternalPlatformNameOci {
+		// Add kernel args for external platforms
+		externalPlatformName := agentClusterInstall.GetExternalPlatformName()
+		switch externalPlatformName {
+		case agent.ExternalPlatformNameOci:
 			logrus.Debugf("Added kernel args to enable serial console for %s %s platform", hiveext.ExternalPlatformType, agent.ExternalPlatformNameOci)
 			a.consoleArgs = " console=ttyS0"
+		case agent.ExternalPlatformNameIBMZ:
+			logrus.Debugf("Added kernel args to enable serial console for %s %s platform", hiveext.ExternalPlatformType, agent.ExternalPlatformNameIBMZ)
+			a.consoleArgs = " console=ttysclp0"
 		}
 
 	case workflow.AgentWorkflowTypeAddNodes:
diff --git a/pkg/asset/agent/installconfig.go b/pkg/asset/agent/installconfig.go
index 893dc47d78..cbe1b38589 100644
--- a/pkg/asset/agent/installconfig.go
+++ b/pkg/asset/agent/installconfig.go
@@ -125,8 +125,8 @@ func ValidateSupportedPlatforms(platform types.Platform, controlPlaneArch string
 	if platform.Name() != none.Name && controlPlaneArch == types.ArchitecturePPC64LE {
 		allErrs = append(allErrs, field.Invalid(fieldPath, platform.Name(), fmt.Sprintf("CPU architecture \"%s\" only supports platform \"%s\".", types.ArchitecturePPC64LE, none.Name)))
 	}
-	if platform.Name() != none.Name && controlPlaneArch == types.ArchitectureS390X {
-		allErrs = append(allErrs, field.Invalid(fieldPath, platform.Name(), fmt.Sprintf("CPU architecture \"%s\" only supports platform \"%s\".", types.ArchitectureS390X, none.Name)))
+	if platform.Name() != none.Name && platform.Name() != external.Name && controlPlaneArch == types.ArchitectureS390X {
+		allErrs = append(allErrs, field.Invalid(fieldPath, platform.Name(), fmt.Sprintf("CPU architecture \"%s\" only supports platform \"%s\" or \"%s\".", types.ArchitectureS390X, none.Name, external.Name)))
 	}
 	return allErrs
 }
@@ -135,6 +135,7 @@ func (a *OptionalInstallConfig) validatePlatformsByName(installConfig *types.Ins
 	var allErrs field.ErrorList
 
 	if installConfig.Platform.Name() == external.Name {
+		// Validate OCI platform requirements
 		if installConfig.Platform.External.PlatformName == ExternalPlatformNameOci &&
 			installConfig.Platform.External.CloudControllerManager != external.CloudControllerManagerTypeExternal {
 			fieldPath := field.NewPath("platform", "external", "cloudControllerManager")
@@ -142,6 +143,14 @@ func (a *OptionalInstallConfig) validatePlatformsByName(installConfig *types.Ins
 				fmt.Sprintf("When using external %s platform, %s must be set to %s",
 					ExternalPlatformNameOci, fieldPath, external.CloudControllerManagerTypeExternal)))
 		}
+		// Validate IBM Z platform requirements
+		if installConfig.Platform.External.PlatformName == ExternalPlatformNameIBMZ &&
+			installConfig.Platform.External.CloudControllerManager != external.CloudControllerManagerTypeExternal {
+			fieldPath := field.NewPath("platform", "external", "cloudControllerManager")
+			allErrs = append(allErrs, field.Invalid(fieldPath, installConfig.Platform.External.CloudControllerManager,
+				fmt.Sprintf("When using external %s platform, %s must be set to %s",
+					ExternalPlatformNameIBMZ, fieldPath, external.CloudControllerManagerTypeExternal)))
+		}
 	}
 
 	if installConfig.Platform.Name() == vsphere.Name {