3 files changed, 13 insertions, 3 deletions
diff --git a/os/hal/ports/STM32/OTGv1/usb_lld.c b/os/hal/ports/STM32/OTGv1/usb_lld.c
index 39464b367..433a75802 100644
--- a/os/hal/ports/STM32/OTGv1/usb_lld.c
+++ b/os/hal/ports/STM32/OTGv1/usb_lld.c
@@ -230,7 +230,7 @@ static uint8_t *otg_do_push(volatile uint32_t *fifop, uint8_t *buf, size_t n) {
   while (n > 0) {
     /* Note, this line relies on the Cortex-M3/M4 ability to perform
        unaligned word accesses and on the LSB-first memory organization.*/
-    *fifop = *((uint32_t *)buf);
+    *fifop = *((PACKED_VAR uint32_t *)buf);
     buf += 4;
     n--;
   }
@@ -328,7 +328,7 @@ static uint8_t *otg_do_pop(volatile uint32_t *fifop, uint8_t *buf, size_t n) {
     uint32_t w = *fifop;
     /* Note, this line relies on the Cortex-M3/M4 ability to perform
        unaligned word accesses and on the LSB-first memory organization.*/
-    *((uint32_t *)buf) = w;
+    *((PACKED_VAR uint32_t *)buf) = w;
     buf += 4;
     n--;
   }
@@ -357,7 +357,7 @@ static void otg_fifo_read_to_buffer(volatile uint32_t *fifop,
     if (max) {
       /* Note, this line relies on the Cortex-M3/M4 ability to perform
          unaligned word accesses and on the LSB-first memory organization.*/
-      *((uint32_t *)buf) = w;
+      *((PACKED_VAR uint32_t *)buf) = w;
       buf += 4;
       max--;
     }
diff --git a/os/nil/ports/ARMCMx/compilers/GCC/niltypes.h b/os/nil/ports/ARMCMx/compilers/GCC/niltypes.h
index 8b206cb1d..5c4781909 100644
--- a/os/nil/ports/ARMCMx/compilers/GCC/niltypes.h
+++ b/os/nil/ports/ARMCMx/compilers/GCC/niltypes.h
@@ -77,6 +77,11 @@ typedef uint32_t        ucnt_t;         /**< Generic unsigned counter.      */
 #define PORT_THD_FUNCTION(tname, arg)                                       \
   __attribute__((noreturn)) void tname(void *arg)
 
+/**
+ * @brief   Packed variable specifier.
+ */
+#define PACKED_VAR __attribute__((packed))
+
 #endif /* _NILTYPES_H_ */
 
 /** @} */
diff --git a/os/rt/ports/ARMCMx/compilers/GCC/chtypes.h b/os/rt/ports/ARMCMx/compilers/GCC/chtypes.h
index 690b817a6..8acbbfa4e 100644
--- a/os/rt/ports/ARMCMx/compilers/GCC/chtypes.h
+++ b/os/rt/ports/ARMCMx/compilers/GCC/chtypes.h
@@ -101,6 +101,11 @@ typedef uint32_t            ucnt_t;         /**< Generic unsigned counter.  */
  */
 #define PORT_THD_FUNCTION(tname, arg) msg_t tname(void *arg)
 
+/**
+ * @brief   Packed variable specifier.
+ */
+#define PACKED_VAR __attribute__((packed))
+
 #endif /* _CHTYPES_H_ */
 
 /** @} */