On a arm64 SNO environment when I go to patch the internal registry with a default route the route is never created.   On x86 the route is created properly.   If I manually create the route crd and apply it it does work.

    4.15.6

    100%

$ oc get routes -A
NAMESPACE                  NAME                      HOST/PORT                                                                                 PATH        SERVICES            PORT    TERMINATION            WILDCARD
openshift-authentication   oauth-openshift           oauth-openshift.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                                            oauth-openshift     6443    passthrough/Redirect   None
openshift-console          console                   console-openshift-console.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                                  console             https   reencrypt/Redirect     None
openshift-console          downloads                 downloads-openshift-console.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                                downloads           http    edge/Redirect          None
openshift-ingress-canary   canary                    canary-openshift-ingress-canary.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                            ingress-canary      8080    edge/Redirect          None
openshift-monitoring       alertmanager-main         alertmanager-main-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com         /api        alertmanager-main   web     reencrypt/Redirect     None
openshift-monitoring       prometheus-k8s            prometheus-k8s-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com            /api        prometheus-k8s      web     reencrypt/Redirect     None
openshift-monitoring       prometheus-k8s-federate   prometheus-k8s-federate-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com   /federate   prometheus-k8s      web     reencrypt/Redirect     None
openshift-monitoring       thanos-querier            thanos-querier-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com            /api        thanos-querier      web     reencrypt/Redirect     None

$ oc patch configs.imageregistry.operator.openshift.io cluster --type merge --patch '{"spec":{"managementState":"Managed"}}'
config.imageregistry.operator.openshift.io/cluster patched

$ oc get pods -A|grep registry
openshift-image-registry                           cluster-image-registry-operator-7d57c868cc-m74wt                 1/1     Running     0             41h
openshift-image-registry                           image-pruner-28546560-trvvr                                      0/1     Completed   0             37h
openshift-image-registry                           image-pruner-28548000-wwplr                                      0/1     Completed   0             13h
openshift-image-registry                           node-ca-k97kk                                                    1/1     Running     0             40h
$ oc patch configs.imageregistry.operator.openshift.io/cluster --patch '{"spec":{"defaultRoute":true}}' --type=merge
config.imageregistry.operator.openshift.io/cluster patched

$ oc get routes -A
NAMESPACE                  NAME                      HOST/PORT                                                                                 PATH        SERVICES            PORT    TERMINATION            WILDCARD
openshift-authentication   oauth-openshift           oauth-openshift.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                                            oauth-openshift     6443    passthrough/Redirect   None
openshift-console          console                   console-openshift-console.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                                  console             https   reencrypt/Redirect     None
openshift-console          downloads                 downloads-openshift-console.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                                downloads           http    edge/Redirect          None
openshift-ingress-canary   canary                    canary-openshift-ingress-canary.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com                            ingress-canary      8080    edge/Redirect          None
openshift-monitoring       alertmanager-main         alertmanager-main-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com         /api        alertmanager-main   web     reencrypt/Redirect     None
openshift-monitoring       prometheus-k8s            prometheus-k8s-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com            /api        prometheus-k8s      web     reencrypt/Redirect     None
openshift-monitoring       prometheus-k8s-federate   prometheus-k8s-federate-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com   /federate   prometheus-k8s      web     reencrypt/Redirect     None
openshift-monitoring       thanos-querier            thanos-querier-openshift-monitoring.apps.nvd-srv-19.nvidia.eng.rdu2.redhat.com            /api        thanos-querier      web     reencrypt/Redirect     None

$ export REGISTRY=`oc get route default-route -n openshift-image-registry --template='{{ .spec.host }}'`
Error from server (NotFound): routes.route.openshift.io "default-route" not found

$ oc get nodes -o wide
NAME                                    STATUS   ROLES                         AGE   VERSION           INTERNAL-IP   EXTERNAL-IP   OS-IMAGE                                                       KERNEL-VERSION                  CONTAINER-RUNTIME
nvd-srv-19.nvidia.eng.rdu2.redhat.com   Ready    control-plane,master,worker   41h   v1.28.7+f1b5f6c   10.8.231.38   <none>        Red Hat Enterprise Linux CoreOS 415.92.202403270524-0 (Plow)   5.14.0-284.59.1.el9_2.aarch64   cri-o://1.28.4-8.rhaos4.15.git24f50b9.el9
     

    No default route is created 

    The local image registry should have a default route created that is visible in routes table.

    If you create a route yaml CRD and apply it you can work around the issue.