diff --git a/arch/BUILD.gn b/arch/BUILD.gn
index f1bed67e..b027c2e1 100644
--- a/arch/BUILD.gn
+++ b/arch/BUILD.gn
@@ -39,7 +39,8 @@ module_group("arch") {
       "$board_cpu" == "cortex-m4" || "$board_cpu" == "cortex-m7" ||
       "$board_cpu" == "cortex-m33" || "$board_cpu" == "cortex-m55") {
     modules += [ "arm" ]
-  } else if ("$board_cpu" == "ck802" || "$board_cpu" == "e802") {
+  } else if ("$board_cpu" == "ck802" || "$board_cpu" == "e802" ||
+             "$board_cpu" == "ck804ef") {
     modules += [ "csky" ]
   } else if ("$board_cpu" == "") {
     if ("$board_arch" == "rv32imac" || "$board_arch" == "rv32imafdc") {
diff --git a/arch/csky/v2/gcc/los_arch_context.h b/arch/csky/v2/gcc/los_arch_context.h
index bbff2cf3..04c25c67 100644
--- a/arch/csky/v2/gcc/los_arch_context.h
+++ b/arch/csky/v2/gcc/los_arch_context.h
@@ -59,13 +59,33 @@ typedef struct TagTskContext {
     UINT32 R12;
     UINT32 R13;
     UINT32 R15;
+#ifdef CPU_CK804
+    UINT32 R16;
+    UINT32 R17;
+    UINT32 R18;
+    UINT32 R19;
+    UINT32 R20;
+    UINT32 R21;
+    UINT32 R22;
+    UINT32 R23;
+    UINT32 R24;
+    UINT32 R25;
+    UINT32 R26;
+    UINT32 R27;
+    UINT32 R28;
+    UINT32 R29;
+    UINT32 R30;
+    UINT32 R31;
+#endif
     UINT32 EPSR;
     UINT32 EPC;
 } TaskContext;
 
 VOID HalStartToRun(VOID);
 VOID HalTaskContextSwitch(VOID);
+#ifndef CPU_CK804
 VOID HalIrqEndCheckNeedSched(VOID);
+#endif
 
 #ifdef __cplusplus
 #if __cplusplus
diff --git a/arch/csky/v2/gcc/los_arch_interrupt.h b/arch/csky/v2/gcc/los_arch_interrupt.h
index c9db621a..bcd5728e 100644
--- a/arch/csky/v2/gcc/los_arch_interrupt.h
+++ b/arch/csky/v2/gcc/los_arch_interrupt.h
@@ -82,7 +82,7 @@ typedef VOID (**HWI_VECTOR_FUNC)(VOID);
  * @ingroup los_arch_interrupt
  * Count of interrupts.
  */
-extern UINT32 g_intCount;
+extern volatile UINT32 g_intCount;
 
 /* *
  * @ingroup los_arch_interrupt
diff --git a/arch/csky/v2/gcc/los_context.c b/arch/csky/v2/gcc/los_context.c
index 6a82b9cd..7fc61e49 100644
--- a/arch/csky/v2/gcc/los_context.c
+++ b/arch/csky/v2/gcc/los_context.c
@@ -38,7 +38,9 @@
 #include "los_interrupt.h"
 #include "los_debug.h"
 
+#ifndef CPU_CK804
 STATIC UINT32 g_sysNeedSched = FALSE;
+#endif
 
 /* ****************************************************************************
  Function    : ArchInit
@@ -93,8 +95,29 @@ LITE_OS_SEC_TEXT_INIT VOID *ArchTskStackInit(UINT32 taskID, UINT32 stackSize, VO
     context->R11 = 0x11111111L;
     context->R12 = 0x12121212L;
     context->R13 = 0x13131313L;
+#ifdef CPU_CK804
+    context->R15 = (UINT32)ArchSysExit;
+    context->R16 = 0x16161616L;
+    context->R17 = 0x17171717L;
+    context->R18 = 0x18181818L;
+    context->R19 = 0x19191919L;
+    context->R20 = 0x20202020L;
+    context->R21 = 0x21212121L;
+    context->R22 = 0x22222222L;
+    context->R23 = 0x23232323L;
+    context->R24 = 0x24242424L;
+    context->R25 = 0x25252525L;
+    context->R26 = 0x26262626L;
+    context->R27 = 0x27272727L;
+    context->R28 = 0x28282828L;
+    context->R29 = 0x29292929L;
+    context->R30 = 0x30303030L;
+    context->R31 = 0x31313131L;
+    context->EPSR = 0x80000340L;
+#else
     context->R15 = (UINT32)ArchSysExit;
     context->EPSR = 0xe0000144L;
+#endif
     context->EPC = (UINT32)OsTaskEntry;
     return (VOID *)context;
 }
@@ -107,6 +130,7 @@ LITE_OS_SEC_TEXT_INIT UINT32 ArchStartSchedule(VOID)
     return LOS_OK; /* never return */
 }
 
+#ifndef CPU_CK804
 VOID HalIrqEndCheckNeedSched(VOID)
 {
     if (g_sysNeedSched && g_taskScheduled && LOS_CHECK_SCHEDULE) {
@@ -132,3 +156,10 @@ VOID ArchTaskSchedule(VOID)
     LOS_IntRestore(intSave);
     return;
 }
+#else
+VOID ArchTaskSchedule(VOID)
+{
+    HalTaskContextSwitch();
+}
+#endif
+
diff --git a/arch/csky/v2/gcc/los_dispatch.S b/arch/csky/v2/gcc/los_dispatch.S
index 3ce7bb07..7c89e880 100644
--- a/arch/csky/v2/gcc/los_dispatch.S
+++ b/arch/csky/v2/gcc/los_dispatch.S
@@ -32,6 +32,89 @@
 #define OS_TASK_STATUS_RUNNING    0x0010
 #define VIC_TSPDR                 0XE000EC08
 
+#ifdef CPU_CK804
+.section .text
+.align  2
+.type HalStartToRun, %function
+.global HalStartToRun
+HalStartToRun:
+    lrw    r1, g_losTask
+    lrw    r2, g_losTask + 4
+
+    ldw    r0, (r2)
+
+    st.w   r0, (r1)
+    st.w   r0, (r2)
+
+    ldw    sp, (r0)
+
+    ldw    r0, (sp, 128)
+    mtcr   r0, epc
+    ldw    r0, (sp, 124)
+    mtcr   r0, epsr
+    ldw    r15, (sp, 56)
+    ldm    r0-r13, (sp)
+    addi     sp, 60
+    ldm      r16-r31, (sp)
+    addi     sp, 72
+
+    rte
+
+.align  2
+.type HalTaskContextSwitch, %function
+.global HalTaskContextSwitch
+HalTaskContextSwitch:
+    lrw    r0, VIC_TSPDR
+    bgeni  r1, 0
+    stw    r1, (r0)
+    nop
+    nop
+    nop
+    rts
+    
+.align  2
+.type tspend_handler, %function
+.global tspend_handler
+tspend_handler:
+
+    subi   sp, 132
+    stm    r0-r13, (sp)
+    stw    r15, (sp, 56)
+    addi     r0, sp, 60
+    stm      r16-r31, (r0)
+    mfcr     r1, epsr
+    stw    r1, (sp, 124)
+    mfcr     r1, epc
+    stw    r1, (sp, 128)
+
+    jbsr    OsSchedTaskSwitch
+    bez     r0, ret_con
+    
+    lrw    r2, g_losTask
+    ldw    r0, (r2)
+    stw    sp, (r0)
+
+    lrw    r3, g_losTask + 4
+    ldw    r0, (r3)
+    stw    r0, (r2)
+
+    ldw    sp, (r0)
+    
+ ret_con:   
+    ldw    r0, (sp, 128)
+    mtcr   r0, epc
+    ldw    r0, (sp, 124)
+    mtcr   r0, epsr
+    ldw    r15, (sp, 56)
+    ldm    r0-r13, (sp)
+    addi     sp, 60
+    ldm      r16-r31, (sp)
+
+    addi   sp, 72
+
+    rte
+    
+#else
 .section .text
 .align  2
 .type HalStartToRun, %function
@@ -87,3 +170,4 @@ HalTaskContextSwitch:
 
     rte
 
+#endif
diff --git a/arch/csky/v2/gcc/los_exc.S b/arch/csky/v2/gcc/los_exc.S
index 23f2a33f..46fe8b24 100644
--- a/arch/csky/v2/gcc/los_exc.S
+++ b/arch/csky/v2/gcc/los_exc.S
@@ -32,6 +32,57 @@
 .import HalExcHandleEntry
 .extern g_trapStackBase
 
+#ifdef CPU_CK804
+.section .text
+.align  2
+.global HandleEntry
+HandleEntry:
+    mov    r10, sp
+    lrw    r14, g_trapStackBase
+
+    stm    r0-r15, (sp)
+    stw    r10, (sp, 56)
+    addi     r0, sp, 64
+    stm      r16-r31, (r0)
+    mfcr   r0, epsr
+    stw    r0, (sp, 128)
+    mfcr   r0, epc
+    stw    r0, (sp, 132)
+    mov    r0, sp
+
+    mfcr   r1, epc
+
+    mov    sp, r10
+    lrw    r2, HalExcHandleEntry
+    jmp    r2
+
+.section .text
+.align  2
+.global IrqEntry
+IrqEntry:
+    psrset  ee
+    subi   sp, 136
+    stm    r0-r15, (sp)
+    addi     r0, sp, 64
+    stm      r16-r31, (r0)
+    mfcr   r0, epsr
+    stw    r0, (sp, 128)
+    mfcr   r0, epc
+    stw    r0, (sp, 132)
+
+    jbsr   HalInterrupt
+
+    ldw    r0, (sp, 132)
+    mtcr   r0, epc
+    ldw    r0, (sp, 128)
+    bseti  r0, r0, 6
+    mtcr   r0, epsr
+    ldm    r0-r15, (sp)
+    addi     sp, 64
+    ldm      r16-r31, (sp)
+    addi   sp, 72
+    rte
+#else
 .section .text
 .align  2
 .global HandleEntry
@@ -75,3 +126,4 @@ IrqEntry:
     ldm    r0-r15, (sp)
     addi   sp, 72
     rte
+#endif
\ No newline at end of file
diff --git a/arch/csky/v2/gcc/los_interrupt.c b/arch/csky/v2/gcc/los_interrupt.c
index 7131fd40..2bea0454 100644
--- a/arch/csky/v2/gcc/los_interrupt.c
+++ b/arch/csky/v2/gcc/los_interrupt.c
@@ -52,13 +52,12 @@
 #define MASK_8_BITS      0xFF
 #define MASK_32_BITS     0xFFFFFFFF
 #define BYTES_OF_128_INT 4
-#define TIM_INT_NUM      1
 
 #define OS_USER_HWI_MIN                 0
 #define OS_USER_HWI_MAX                 (LOSCFG_PLATFORM_HWI_LIMIT - 1)
 #define HWI_ALIGNSIZE                   0x400
 
-UINT32 g_intCount = 0;
+UINT32 volatile g_intCount = 0;
 CHAR g_trapStackBase[OS_TRAP_STACK_SIZE];
 
 VIC_TYPE *VIC_REG = (VIC_TYPE *)VIC_REG_BASE;
@@ -334,7 +333,9 @@ LITE_OS_SEC_TEXT VOID HalInterrupt(VOID)
 
     intSave = LOS_IntLock();
     g_intCount--;
+#ifndef CPU_CK804
     HalIrqEndCheckNeedSched();
+#endif
     LOS_IntRestore(intSave);
 }
 
@@ -586,6 +587,10 @@ WEAK VOID __stack_chk_fail(VOID)
               __builtin_return_address(0));
 }
 
+WEAK void HalHwiHandleReInit(UINT32 hwiFormAddr)
+{
+}
+
 /* ****************************************************************************
  Function    : HalHwiInit
  Description : initialization of the hardware interrupt
@@ -604,6 +609,7 @@ LITE_OS_SEC_TEXT_INIT VOID HalHwiInit(VOID)
     for (i = OS_SYS_VECTOR_CNT; i < (LOSCFG_PLATFORM_HWI_LIMIT + OS_SYS_VECTOR_CNT); i++) {
         g_hwiForm[i] = (HWI_PROC_FUNC)IrqEntry;
     }
+    HalHwiHandleReInit((UINT32)&g_hwiForm);
 
     HalSetVbr((UINT32)&g_hwiForm);
     for (int i = 0; i < BYTES_OF_128_INT; i++) {
diff --git a/arch/csky/v2/gcc/los_timer.c b/arch/csky/v2/gcc/los_timer.c
index f572c12a..99bd2b69 100644
--- a/arch/csky/v2/gcc/los_timer.c
+++ b/arch/csky/v2/gcc/los_timer.c
@@ -50,7 +50,11 @@ typedef struct {
 #define CORETIM_SOURCE       (1UL << 2)
 #define CORETIM_MODE         (1UL << 16)
 
+#ifdef CPU_CK804
+#define TIM_INT_NUM          25
+#else
 #define TIM_INT_NUM          1
+#endif
 
 STATIC UINT32 SysTickStart(HWI_PROC_FUNC handler);
 STATIC UINT64 SysTickReload(UINT64 nextResponseTime);