下行转发测试通过，差一个last设备启动上行

tb/sw/src/slvStartup.S

@@ -27,36 +27,15 @@ trap_entry:
 
 	# q寄存器已经禁用， Without the q-registers, the irq return address will be stored in x3 (gp) and the IRQ bitmask in x4 (tp),
 
-	# addi x15, x4, 0
+	# io.interrupt(0) := intTxError
+	# io.interrupt(1) := intRxError
+	# io.interrupt(2) := intRxStart
+	# io.interrupt(3) := intRxEnd
 
-#   io.interrupt(0) := intTxError
-#   io.interrupt(1) := intTxFifoFull
-#   io.interrupt(2) := intTxFinish
 
-#   io.interrupt(3) := intRxError
-#   io.interrupt(4) := intRxValid
-#   io.interrupt(5) := intTxError
-#   io.interrupt(6) := intTxFifoFull
-#   io.interrupt(7) := intTxFinish
+	or sp, sp, x4
+
 
-#   io.interrupt(8) := intRxError
-#   io.interrupt(9) := intRxValid
-	# andi ra, x4, 0x02
-	# bnez ra, 1f
-	# addi, sp, sp, 2048
-1:
-	andi ra, x4, 0x10
-	bnez ra, 2f
-	addi sp, sp, 1
-2:
-	# andi ra, x4, 0x40
-	# bnez ra, 3f
-	# addi, sp, sp, 2048
-3:
-	andi ra, x4, 0x200
-	bnez ra, 4f
-	addi sp, sp, 1
-4:
 	picorv32_retirq_insn()