diff --git a/libcpu/risc-v/t-head/c906/cache.c b/libcpu/risc-v/t-head/c906/cache.c
index 4250f3a1d26cb97c7d29b60dc93e84374739318d..1bb01edec70b347ef5233586d9de854c5e68afa0 100644
--- a/libcpu/risc-v/t-head/c906/cache.c
+++ b/libcpu/risc-v/t-head/c906/cache.c
@@ -16,6 +16,15 @@
 
 #define L1_CACHE_BYTES (64)
 
+/**
+ * GCC version not support t-head cache flush, so we use fixed code to achieve.
+ * The following function cannot be optimized.
+ */
+static void dcache_wb_range(unsigned long start, unsigned long end) __attribute__((optimize("O0")));
+static void dcache_inv_range(unsigned long start, unsigned long end) __attribute__((optimize("O0")));
+static void dcache_wbinv_range(unsigned long start, unsigned long end) __attribute__((optimize("O0")));
+static void icache_inv_range(unsigned long start, unsigned long end) __attribute__((optimize("O0")));
+
 static void dcache_wb_range(unsigned long start, unsigned long end)
 {
     unsigned long i = start & ~(L1_CACHE_BYTES - 1);