boards: cc1352r1_launchxl / cc26x2r1_launchxl: enable ROM bootloader

This enables the ROM bootloader on the CC13x2 / CC26x2 LaunchPad
development boards. The bootloader can be started by holding BTN-1
during reset. This can be useful during development to recover a board
if DAPs get disabled.

Signed-off-by: Brett Witherspoon <spoonb@cdspooner.com>

boards/arm/cc1352r1_launchxl/cc1352r1_launchxl_defconfig

@@ -10,6 +10,10 @@ CONFIG_SOC_CC1352R=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_BOARD_CC1352R1_LAUNCHXL=y
 
+CONFIG_CC13X2_CC26X2_BOOTLOADER_ENABLE=y
+CONFIG_CC13X2_CC26X2_BOOTLOADER_BACKDOOR_ENABLE=y
+CONFIG_CC13X2_CC26X2_BOOTLOADER_BACKDOOR_PIN=15
+
 CONFIG_PINMUX=y
 CONFIG_GPIO=y
 CONFIG_SERIAL=y

boards/arm/cc1352r1_launchxl/doc/index.rst

@@ -165,6 +165,15 @@ You can debug an application in the usual way.  Here is an example for the
    :maybe-skip-config:
    :goals: debug
 
+Bootloader
+==========
+
+The ROM bootloader on CC13x2 and CC26x2 devices is enabled by default. The
+bootloader will start if there is no valid application image in flash or the
+so-called backdoor is enabled (via option
+:option:`CONFIG_CC13X2_CC26X2_BOOTLOADER_BACKDOOR_ENABLE`) and BTN-1 is held
+down during reset. See the bootloader documentation in chapter 10 of the `TI
+CC13x2 / CC26x2 Technical Reference Manual`_ for additional information.
 
 References
 **********
@@ -177,3 +186,6 @@ CC1352R1 LaunchPad Quick Start Guide:
 
 .. _TI CC1352R Product Page:
    http://www.ti.com/product/cc1352r
+
+.. _TI CC13x2 / CC26x2 Technical Reference Manual:
+   http://www.ti.com/lit/pdf/swcu185

boards/arm/cc26x2r1_launchxl/cc26x2r1_launchxl_defconfig

@@ -10,6 +10,10 @@ CONFIG_SOC_CC2652R=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_BOARD_CC26X2R1_LAUNCHXL=y
 
+CONFIG_CC13X2_CC26X2_BOOTLOADER_ENABLE=y
+CONFIG_CC13X2_CC26X2_BOOTLOADER_BACKDOOR_ENABLE=y
+CONFIG_CC13X2_CC26X2_BOOTLOADER_BACKDOOR_PIN=13
+
 CONFIG_PINMUX=y
 CONFIG_GPIO=y
 CONFIG_SERIAL=y

boards/arm/cc26x2r1_launchxl/doc/index.rst

@@ -171,6 +171,15 @@ You can debug an application in the usual way.  Here is an example for the
    :maybe-skip-config:
    :goals: debug
 
+Bootloader
+==========
+
+The ROM bootloader on CC13x2 and CC26x2 devices is enabled by default. The
+bootloader will start if there is no valid application image in flash or the
+so-called backdoor is enabled (via option
+:option:`CONFIG_CC13X2_CC26X2_BOOTLOADER_BACKDOOR_ENABLE`) and BTN-1 is held
+down during reset. See the bootloader documentation in chapter 10 of the `TI
+CC13x2 / CC26x2 Technical Reference Manual`_ for additional information.
 
 References
 **********
@@ -190,5 +199,5 @@ CC26X2R1 LaunchPad Quick Start Guide:
 .. _TI CC2652R Datasheet:
    http://www.ti.com/lit/pdf/swrs207
 
-.. _TI CC26x2R Technical Reference Manual:
+.. _TI CC13x2 / CC26x2 Technical Reference Manual:
    http://www.ti.com/lit/pdf/swcu185