Crash dump : force data to be written in RAM

Due to ECC cache mechanism, the last data is not guarantee to be
written in RAM before a system reset. With this modification, we
ensure that the crc is well written.

Fiw #11422

Signed-off-by: Vincent Veron <[email protected]>

Author: VVESTM

platform/mbed_error.h

@@ -849,6 +849,7 @@ typedef struct _mbed_error_ctx {
     int32_t is_error_processed;//once this error is processed set this value to 1
     uint32_t crc_error_ctx;//crc_error_ctx should always be the last member in this struct
 #endif
+    uint64_t dummy; // dummy to force data to be written in RAM
 } mbed_error_ctx;
 
 /** To generate a fatal compile-time error, you can use the pre-processor #error directive.

platform/source/mbed_error.c

@@ -336,6 +336,7 @@ WEAK MBED_NORETURN mbed_error_status_t mbed_error(mbed_error_status_t error_stat
     core_util_critical_section_enter();
     memcpy(report_error_ctx, &last_error_ctx, sizeof(mbed_error_ctx));
     core_util_critical_section_exit();
+
     //We need not call delete_mbed_crc(crc_obj) here as we are going to reset the system anyway, and calling delete while handling a fatal error may cause nested exception
 #if MBED_CONF_PLATFORM_FATAL_ERROR_AUTO_REBOOT_ENABLED && (MBED_CONF_PLATFORM_ERROR_REBOOT_MAX > 0)
 #ifndef NDEBUG