HAL_ChibiOS: disable USART1 till USB problem solved

using USART1 causes USB disconnects. The behaviour is like CTS/RTS is
enabled on USART1, but it is disabled.

libraries/AP_HAL_ChibiOS/hwdef/revo-mini/hwdef.dat

@@ -22,14 +22,14 @@ FLASH_SIZE_KB 1024
 # board voltage
 STM32_VDD 330U
 
-STDOUT_SERIAL SD1
-STDOUT_BAUDRATE 115200
+STDOUT_SERIAL SD3
+STDOUT_BAUDRATE 57600
 
 # only one I2C bus
 I2C_ORDER I2C1
 
 # order of UARTs (and USB)
-UART_ORDER OTG1 USART6 USART1 USART3
+UART_ORDER OTG1 USART6 USART3
 
 # we need to add support for N channels for RCIN
 # PB14 TIM8_CH2 TIM8 RCIN PULLUP LOW DMA_CH0
@@ -51,13 +51,15 @@ PB4 LED_RED OUTPUT LOW GPIO(2)
 PC6 USART6_TX USART6
 PC7 USART6_RX USART6
 
-# this is a very strange workaround for a USB problem. Needs investigating
-define GCS_SETUP_UART_FIRST 2
-
 # flexi port, telem2 (can also be I2C2)
 PB10 USART3_TX USART3
 PB11 USART3_RX USART3
 
+# main port. This should be telem1, but is disabled as it interferes
+# #with USB for some unknown reason
+#PA9 USART1_TX USART1
+#PA10 USART1_RX USART1
+
 # alternative config
 # PB10 I2C2_SCL I2C2
 # PB11 I2C2_SDA I2C2
@@ -75,12 +77,10 @@ PC12 SPI3_MOSI SPI3
 # IRQ for MPU6000
 PC4 EXTI_MPU6000 INPUT
 
-PA9 USART1_TX USART1
-PA10 USART1_RX USART1
-
 # PA10 IO-debug-console
 PA11 OTG_FS_DM OTG1
 PA12 OTG_FS_DP OTG1
+
 PA13 JTMS-SWDIO SWD
 PA14 JTCK-SWCLK SWD
 
@@ -126,3 +126,4 @@ define HAL_BARO_MS5611_I2C_ADDR 0x77
 # SPI devices
 SPIDEV mpu6000   SPI1 DEVID1 MPU_CS   MODE3 1*MHZ 8*MHZ 
 SPIDEV dataflash SPI3 DEVID1 FLASH_CS MODE3 1*MHZ 8*MHZ
+