2 files changed, 9 insertions, 6 deletions
diff --git a/src/device/dcd.h b/src/device/dcd.h
index 0ecdec4ed..789552d47 100644
--- a/src/device/dcd.h
+++ b/src/device/dcd.h
@@ -93,15 +93,15 @@ typedef struct TU_ATTR_ALIGNED(4) {
 
 // clean/flush data cache: write cache -> memory.
 // Required before an DMA TX transfer to make sure data is in memory
-void dcd_dcache_clean(const void* addr, uint32_t data_size);
+bool dcd_dcache_clean(const void* addr, uint32_t data_size);
 
 // invalidate data cache: mark cache as invalid, next read will read from memory
 // Required BOTH before and after an DMA RX transfer
-void dcd_dcache_invalidate(const void* addr, uint32_t data_size);
+bool dcd_dcache_invalidate(const void* addr, uint32_t data_size);
 
 // clean and invalidate data cache
 // Required before an DMA transfer where memory is both read/write by DMA
-void dcd_dcache_clean_invalidate(const void* addr, uint32_t data_size);
+bool dcd_dcache_clean_invalidate(const void* addr, uint32_t data_size);
 
 //--------------------------------------------------------------------+
 // Controller API
diff --git a/src/device/usbd.c b/src/device/usbd.c
index f485b6872..2a6081673 100644
--- a/src/device/usbd.c
+++ b/src/device/usbd.c
@@ -97,16 +97,19 @@ TU_ATTR_WEAK void dcd_disconnect(uint8_t rhport) {
   (void) rhport;
 }
 
-TU_ATTR_WEAK void dcd_dcache_clean(const void* addr, uint32_t data_size) {
+TU_ATTR_WEAK bool dcd_dcache_clean(const void* addr, uint32_t data_size) {
   (void) addr; (void) data_size;
+  return true;
 }
 
-TU_ATTR_WEAK void dcd_dcache_invalidate(const void* addr, uint32_t data_size) {
+TU_ATTR_WEAK bool dcd_dcache_invalidate(const void* addr, uint32_t data_size) {
   (void) addr; (void) data_size;
+  return true;
 }
 
-TU_ATTR_WEAK void dcd_dcache_clean_invalidate(const void* addr, uint32_t data_size) {
+TU_ATTR_WEAK bool dcd_dcache_clean_invalidate(const void* addr, uint32_t data_size) {
   (void) addr; (void) data_size;
+  return true;
 }
 
 //--------------------------------------------------------------------+