Working on K64F!

Author: multiplemonomials

mbed_app.json5

@@ -70,8 +70,9 @@
             "mcuboot.scratch-address": "0xE0000",
             "mcuboot.scratch-size": "0x20000",
 
-            "mcuboot.max-img-sectors": "0x180",
-            "mcuboot.read-granularity": 512 // External SD card used as block device, this is its read size.
+            "mcuboot.read-granularity": 512, // External SD card used as block device, this is its read size.
+
+            "mcuboot.max-img-sectors": "1536" // External SD card has smaller sector size, so divide slot size by read granularity
         },
 
         "MCU_STM32H743xI": {