From 7c94ffaf2c8ff7b5961ddcc66cbd8eb58a58f591 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=9B=B6=E4=B8=AD=E6=96=AD=E5=BB=B6=E8=BF=9F=E7=9A=84RTOS?=
 <cosyos@139.com>
Date: Sat, 4 Jul 2026 12:03:04 +0000
Subject: [PATCH] update Port/80251/port_80251.h.
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Signed-off-by: 零中断延迟的RTOS <cosyos@139.com>
---
 Port/80251/port_80251.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Port/80251/port_80251.h b/Port/80251/port_80251.h
index d135c5cb..eb204cae 100644
--- a/Port/80251/port_80251.h
+++ b/Port/80251/port_80251.h
@@ -292,4 +292,8 @@ do{ \
 #define mxResumeIRQ()   mx_resume_irq()
 
 
+/* 内存访问屏障 */
+#define __mx_MMB()
+
+
 #endif