Cosmetic update to some comments

arch/arm/src/tiva/chip/tiva_flash.h

@@ -47,7 +47,7 @@
 #if defined(CONFIG_ARCH_CHIP_TM4C129)
 #  include "chip/tm4c_flash.h"
 
-/* Others (including TM4C123) are similar to the LM3S family */
+/* Others (including LM4F and TM4C123) are similar to the LM3S family */
 
 #else
 #  include "chip/lm3s_flash.h"

arch/arm/src/tiva/tiva_lowputc.c

@@ -331,6 +331,11 @@ void up_lowsetup(void)
   /* Enable the selected console device */
 
 #if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
+  /* REVISIT:  There is some missing logic.  We really should wait to be
+   * certain that the selected serial console UART is ready before writing
+   * to the UART registers.
+   */
+
   /* Disable the UART by clearing the UARTEN bit in the UART CTL register */
 
   ctl = getreg32(TIVA_CONSOLE_BASE+TIVA_UART_CTL_OFFSET);