diff --git a/bsp/board/bl702/bl706_avb/peripheral_config.h b/bsp/board/bl702/bl706_avb/peripheral_config.h
index efb0085e..a22ff8bf 100644
--- a/bsp/board/bl702/bl706_avb/peripheral_config.h
+++ b/bsp/board/bl702/bl706_avb/peripheral_config.h
@@ -94,7 +94,7 @@
         .databits = UART_DATA_LEN_8, \
         .stopbits = UART_STOP_ONE,   \
         .parity = UART_PAR_NONE,     \
-        .fifo_threshold = 1,         \
+        .fifo_threshold = 0,         \
     }
 #endif
 #endif
@@ -108,7 +108,7 @@
         .databits = UART_DATA_LEN_8, \
         .stopbits = UART_STOP_ONE,   \
         .parity = UART_PAR_NONE,     \
-        .fifo_threshold = 64,        \
+        .fifo_threshold = 63,        \
     }
 #endif
 #endif
@@ -124,7 +124,7 @@
         .clk_polaraity = SPI_POLARITY_LOW,          \
         .clk_phase = SPI_PHASE_1EDGE,               \
         .datasize = SPI_DATASIZE_8BIT,              \
-        .fifo_threshold = 4,                        \
+        .fifo_threshold = 3,                        \
         .pin_swap_enable = 1,                       \
         .delitch_cnt = 0,                           \
     }
@@ -212,7 +212,7 @@
         .channel_num = I2S_FS_CHANNELS_NUM_MONO, \
         .frame_size = I2S_FRAME_LEN_16,          \
         .data_size = I2S_DATA_LEN_16,            \
-        .fifo_threshold = 8,                     \
+        .fifo_threshold = 7,                     \
     }
 #endif
 #endif
@@ -249,8 +249,8 @@
         .dst_req = DMA_REQUEST_NONE,               \
         .src_addr_inc = DMA_ADDR_INCREMENT_ENABLE, \
         .dst_addr_inc = DMA_ADDR_INCREMENT_ENABLE, \
-        .src_burst_size = DMA_BURST_1BYTE,         \
-        .dst_burst_size = DMA_BURST_1BYTE,         \
+        .src_burst_size = DMA_BURST_4BYTE,         \
+        .dst_burst_size = DMA_BURST_4BYTE,         \
         .src_width = DMA_TRANSFER_WIDTH_16BIT,     \
         .dst_width = DMA_TRANSFER_WIDTH_16BIT,     \
     }
diff --git a/bsp/board/bl702/bl706_avb/pinmux_config.h b/bsp/board/bl702/bl706_avb/pinmux_config.h
index 402117fe..ebe67f08 100644
--- a/bsp/board/bl702/bl706_avb/pinmux_config.h
+++ b/bsp/board/bl702/bl706_avb/pinmux_config.h
@@ -91,7 +91,7 @@
 
 // <q> GPIO17 <2> [GPIO_FUN_UNUSED//GPIO_FUN_I2S//GPIO_FUN_SPI//GPIO_FUN_I2C//GPIO_FUN_PWM//GPIO_FUN_CAM//GPIO_FUN_ADC//GPIO_FUN_UART0_RTS//GPIO_FUN_UART1_RTS//GPIO_FUN_QDEC]
 // <i> config gpio17 function
-#define CONFIG_GPIO17_FUNC GPIO_FUN_UART1_TX
+#define CONFIG_GPIO17_FUNC GPIO_FUN_UNUSED
 
 // <q> GPIO18 <2> [GPIO_FUN_UNUSED//GPIO_FUN_I2S//GPIO_FUN_SPI//GPIO_FUN_I2C//GPIO_FUN_PWM//GPIO_FUN_CAM//GPIO_FUN_ADC//GPIO_FUN_UART0_RTS//GPIO_FUN_UART1_RTS//GPIO_FUN_ETHER_MAC//GPIO_FUN_QDEC]
 // <i> config gpio18 function