EFM32: Correct a typo in LFXO bit in clock configuration

arch/arm/src/efm32/efm32_clockconfig.c

@@ -166,7 +166,7 @@ static void efm32_enable_lfxo(void)
 {
   /* Enable the LFXO */
 
-  putreg32(CMU_OSCENCMD_LFRCOEN, EFM32_CMU_OSCENCMD);
+  putreg32(CMU_OSCENCMD_LFXOEN, EFM32_CMU_OSCENCMD);
   efm32_statuswait(CMU_STATUS_LFXORDY);
 }
 
@@ -610,6 +610,7 @@ static inline uint32_t efm32_lfaclk_config(uint32_t lfaclksel, bool ulfrco,
           case CMU_LFCLKSEL_LFA_LFRCO:
             {
               efm32_enable_lfrco();
+              lfaclk = BOARD_LFRCO_FREQUENCY;
             }
             break;
 

configs/efm32-g8xx-stk/README.txt

@@ -16,11 +16,20 @@ README
     • On-board SEGGER J-Link USB emulator
     • ARM 20 pin JTAG/SWD standard Debug in/out connector
 
+CONTENTS
+=======
+
+    • Status
+    • LEDs
+    • Serial Console
+    • Using the J-Link GDB Server
+    • Configurations
+
 STATUS
 ======
 
-  My board is on order and has not arrived as of this writing.  So no debug
-  has yet been done.  So the status is code-complete but untested.
+  Testing has just begun.  So the status is code-complete but only
+  partially tested.
 
 LEDs
 ====
@@ -64,7 +73,7 @@ LEDs
     on a small proportion of the time.
 *** LED2 may also flicker normally if signals are processed.
 
-Serial Console
+SERIAL CONSOLE
 ==============
 
   Pin Availability
@@ -133,8 +142,58 @@ Serial Console
    send commands to the BC. When EFM_BC_EN is low, EFM_BC_TX and EFM_BC_RX
    can be used by other applications.
 
-Configurations
+USING THE J-LINK GDB SERVER
+===========================
+
+   1. Star the J-Link GDB server.  You should see the start-up confiration
+      window.  SelectL
+
+      a. Target device = EFM32G880F128
+      b. Select Target interface = SWD
+
+   2. Press OK.  The GDB server should start and the last message in the Log
+      output should be "Waiting for GDB connection".
+
+   3. In a terminal window, start GDB:
+
+      arm-none-eabi-gdb
+
+   4. Connect to the J-Link GDB serer:
+
+     (gdb) target remote local host
+
+   5. Load and run nuttx
+
+     (gdb) mon halt
+     (gdb) load nuttx
+     (gdb) mon reset go
+
+   I had to tinker with the setup a few times repeating the same steps above
+   before things finally began to work.  Don't know why.
+
+   To debug code already burned into FLASH:
+ 
+   1. Start the GDB server as above.
+
+   2. In a terminal window, start GDB:
+
+      arm-none-eabi-gdb
+
+   3. Connect to the J-Link GDB serer:
+
+     (gdb) target remote local host
+
+   3. Load the nuttx symbol file, reset, and debug
+
+     (gdb) mon halt
+     (gdb) file nuttx
+     (gdb) mon reset
+     (gdb) s
+     ...
+
+CONFIGURATIONS
 ==============
+
   Each EFM32 Gecko Starter Kit configuration is maintained in a sub-directory
   and can be selected as follow: