feat(android): ota: Check slot from bootconfig instead of commandline

With the bootconfig support in U-Boot, we can no longer inspect
the kernel commandline to get the slot. We need to look at /proc/bootconfig
instead.

Update the OTA guide accordingly.

Signed-off-by: Mattijs Korpershoek <[email protected]>

Author: Mattijs Korpershoek

source/devices/AM62PX/android/Application_Notes_OTA.rst

@@ -135,8 +135,8 @@ OTA via Update Engine
     .. code-block:: console
 
        $ adb root
-       $ adb shell grep -o 'androidboot.slot_suffix=[_ab]*' /proc/cmdline
-       androidboot.slot_suffix=_b
+       $ adb shell grep 'androidboot.slot_suffix' /proc/bootconfig
+       androidboot.slot_suffix = "_b"
 
 
 Troubleshooting

source/devices/AM62X/android/Application_Notes_OTA.rst

@@ -135,8 +135,8 @@ OTA via Update Engine
     .. code-block:: console
 
        $ adb root
-       $ adb shell grep -o 'androidboot.slot_suffix=[_ab]*' /proc/cmdline
-       androidboot.slot_suffix=_b
+       $ adb shell grep 'androidboot.slot_suffix' /proc/bootconfig
+       androidboot.slot_suffix = "_b"
 
 
 Troubleshooting