7 files changed, 14 insertions, 25 deletions
diff --git a/ports/atmel-samd/supervisor/port.c b/ports/atmel-samd/supervisor/port.c
index d65d09825..fc1d1198e 100644
--- a/ports/atmel-samd/supervisor/port.c
+++ b/ports/atmel-samd/supervisor/port.c
@@ -390,8 +390,8 @@ void reset_cpu(void) {
     reset();
 }
 
-supervisor_allocation* port_fixed_stack(void) {
-    return NULL;
+bool port_has_fixed_stack(void) {
+    return false;
 }
 
 uint32_t *port_stack_get_limit(void) {
diff --git a/ports/cxd56/supervisor/port.c b/ports/cxd56/supervisor/port.c
index 086c2d198..d69f35779 100644
--- a/ports/cxd56/supervisor/port.c
+++ b/ports/cxd56/supervisor/port.c
@@ -98,12 +98,8 @@ void reset_to_bootloader(void) {
     }
 }
 
-supervisor_allocation _fixed_stack;
-
-supervisor_allocation* port_fixed_stack(void) {
-    _fixed_stack.ptr = port_stack_get_limit();
-    _fixed_stack.length = (port_stack_get_top() - port_stack_get_limit()) * sizeof(uint32_t);
-    return &_fixed_stack;
+bool port_has_fixed_stack(void) {
+    return true;
 }
 
 uint32_t *port_stack_get_limit(void) {
diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index aff7dbda4..264bdee97 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -193,12 +193,8 @@ uint32_t *port_stack_get_top(void) {
     return port_stack_get_limit() + ESP_TASK_MAIN_STACK / (sizeof(uint32_t) / sizeof(StackType_t));
 }
 
-supervisor_allocation _fixed_stack;
-
-supervisor_allocation* port_fixed_stack(void) {
-    _fixed_stack.ptr = port_stack_get_limit();
-    _fixed_stack.length = (port_stack_get_top() - port_stack_get_limit()) * sizeof(uint32_t);
-    return &_fixed_stack;
+bool port_has_fixed_stack(void) {
+    return true;
 }
 
 // Place the word to save just after our BSS section that gets blanked.
diff --git a/ports/litex/supervisor/port.c b/ports/litex/supervisor/port.c
index 02617b9af..f5c362ea6 100644
--- a/ports/litex/supervisor/port.c
+++ b/ports/litex/supervisor/port.c
@@ -98,8 +98,8 @@ void reset_cpu(void) {
     for(;;) {}
 }
 
-supervisor_allocation* port_fixed_stack(void) {
-    return NULL;
+bool port_has_fixed_stack(void) {
+    return false;
 }
 
 uint32_t *port_heap_get_bottom(void) {
diff --git a/ports/mimxrt10xx/supervisor/port.c b/ports/mimxrt10xx/supervisor/port.c
index e3fef373f..1be2b1039 100644
--- a/ports/mimxrt10xx/supervisor/port.c
+++ b/ports/mimxrt10xx/supervisor/port.c
@@ -334,11 +334,8 @@ uint32_t *port_stack_get_top(void) {
     return &_ld_stack_top;
 }
 
-supervisor_allocation _fixed_stack;
-supervisor_allocation* port_fixed_stack(void) {
-    _fixed_stack.ptr = port_stack_get_limit();
-    _fixed_stack.length = (port_stack_get_top() - port_stack_get_limit()) * sizeof(uint32_t);
-    return &_fixed_stack;
+bool port_has_fixed_stack(void) {
+    return true;
 }
 
 uint32_t *port_heap_get_bottom(void) {
diff --git a/ports/nrf/supervisor/port.c b/ports/nrf/supervisor/port.c
index 493de43e0..5f1c9f1ba 100644
--- a/ports/nrf/supervisor/port.c
+++ b/ports/nrf/supervisor/port.c
@@ -251,8 +251,8 @@ uint32_t *port_heap_get_top(void) {
     return port_stack_get_top();
 }
 
-supervisor_allocation* port_fixed_stack(void) {
-    return NULL;
+bool port_has_fixed_stack(void) {
+    return false;
 }
 
 uint32_t *port_stack_get_limit(void) {
diff --git a/ports/stm/supervisor/port.c b/ports/stm/supervisor/port.c
index a8aab00ff..dba1cf21e 100644
--- a/ports/stm/supervisor/port.c
+++ b/ports/stm/supervisor/port.c
@@ -267,8 +267,8 @@ uint32_t *port_heap_get_top(void) {
     return &_ld_heap_end;
 }
 
-supervisor_allocation* port_fixed_stack(void) {
-    return NULL;
+bool port_has_fixed_stack(void) {
+    return false;
 }
 
 uint32_t *port_stack_get_limit(void) {