diff --git a/bsp/allwinner/d1/board/board.c b/bsp/allwinner/d1/board/board.c
index 0035a3f752..f60390efeb 100644
--- a/bsp/allwinner/d1/board/board.c
+++ b/bsp/allwinner/d1/board/board.c
@@ -83,7 +83,6 @@ void rt_hw_board_init(void)
 #ifdef RT_USING_SMART
     rt_page_init(init_page_region);
     rt_hw_mmu_map_init(&mmu_info,(void *)USER_VADDR_START, USER_VADDR_TOP - USER_VADDR_START, (rt_size_t *)MMUTable, 0);
-    rt_hw_mmu_kernel_map_init(&mmu_info, 0x00000000UL, USER_VADDR_START - 1);
     //将低1GB MMIO区域设置为无Cache与Strong Order访存模式
     MMUTable[0] &= ~PTE_CACHE;
     MMUTable[0] &= ~PTE_SHARE;
diff --git a/libcpu/aarch64/common/include/mmu.h b/libcpu/aarch64/common/include/mmu.h
index 6710d40544..eac4333152 100644
--- a/libcpu/aarch64/common/include/mmu.h
+++ b/libcpu/aarch64/common/include/mmu.h
@@ -115,8 +115,6 @@ void *rt_hw_mmu_map(struct rt_aspace *aspace, void *v_addr, void *p_addr,
 void rt_hw_mmu_unmap(struct rt_aspace *aspace, void *v_addr, size_t size);
 void rt_hw_aspace_switch(struct rt_aspace *aspace);
 void *rt_hw_mmu_v2p(struct rt_aspace *aspace, void *vaddr);
-void rt_hw_mmu_kernel_map_init(struct rt_aspace *aspace, rt_size_t vaddr_start,
-                               rt_size_t size);
 void *rt_hw_mmu_pgtbl_create(void);
 void rt_hw_mmu_pgtbl_delete(void *pgtbl);
 void *rt_hw_mmu_tbl_get(void);
diff --git a/libcpu/arm/cortex-a/mmu.h b/libcpu/arm/cortex-a/mmu.h
index 51158d8c20..9f5e81b12d 100644
--- a/libcpu/arm/cortex-a/mmu.h
+++ b/libcpu/arm/cortex-a/mmu.h
@@ -121,7 +121,6 @@ void rt_hw_aspace_switch(struct rt_aspace *aspace);
 void rt_hw_mmu_switch(void *tbl);
 
 void *rt_hw_mmu_v2p(struct rt_aspace *aspace, void *vaddr);
-void rt_hw_mmu_kernel_map_init(struct rt_aspace *aspace, size_t vaddr_start, size_t size);
 void *rt_hw_mmu_tbl_get(void);
 
 int rt_hw_mmu_control(struct rt_aspace *aspace, void *vaddr, size_t size, enum rt_mmu_cntl cmd);
diff --git a/libcpu/risc-v/common64/mmu.h b/libcpu/risc-v/common64/mmu.h
index 97d2cd0f32..cb9ae45fa4 100644
--- a/libcpu/risc-v/common64/mmu.h
+++ b/libcpu/risc-v/common64/mmu.h
@@ -60,8 +60,6 @@ void *rt_hw_mmu_tbl_get(void);
 int rt_hw_mmu_map_init(rt_aspace_t aspace, void *v_address, rt_ubase_t size,
                        rt_ubase_t *vtable, rt_ubase_t pv_off);
 void rt_hw_mmu_setup(rt_aspace_t aspace, struct mem_desc *mdesc, int desc_nr);
-void rt_hw_mmu_kernel_map_init(rt_aspace_t aspace, rt_ubase_t vaddr_start,
-                               rt_ubase_t size);
 void *rt_hw_mmu_map(rt_aspace_t aspace, void *v_addr, void *p_addr, size_t size,
                     size_t attr);
 void rt_hw_mmu_unmap(rt_aspace_t aspace, void *v_addr, size_t size);