rboot-ota: Always put a checksum in rboot config

Means bootloader will still work if configured to verify the checksum

extras/rboot-ota/rboot-config.h

@@ -1,14 +0,0 @@
-#ifndef _RBOOT_CONFIG_H
-/* rboot configuration parameters.
-
-   Must match the config in the compiler bootloader rboot.h. Values below are the rboot.h defaults.
-
-   Override rboot parameters by editing this file, or (much better
-   alternative) copy rboot-config.h to your program directory or
-   program/include/ directory, then edit it to override these values.
-*/
-
-#define RBOOT_MAX_ROMS 4
-//#define RBOOT_CONFIG_CHECKSUM
-
-#endif

extras/rboot-ota/rboot-integration.h

@@ -28,4 +28,11 @@
 #define RBOOT_DEBUG(f_, ...)
 #endif
 
+/* Enable checksumming when writing out the config,
+   so if the bootloader is built with checksumming then
+   it will still work.
+*/
+#define BOOT_CONFIG_CHKSUM
+
+
 #endif // __RBOOT_INTEGRATION_H__

extras/rboot-ota/rboot.h

@@ -18,8 +18,13 @@ extern "C" {
 // if you aren't using gcc you may need to do this
 //#define BOOT_NO_ASM
 
-// uncomment to have a checksum on the boot config
-//#define BOOT_CONFIG_CHKSUM
+// Note: enabling RBOOT_CONFIG_CHECKSUM here means the config sector
+// is always written by esp-open-rtos with a checksum.
+//
+// This means it will work whether the bootloader has config
+// checksumming enabled or not.
+
+#define BOOT_CONFIG_CHKSUM
 
 // uncomment to enable big flash support (>1MB)
 #define BOOT_BIG_FLASH