Mass Example with External Flash not working with CONFIG_BOOTLOADER_MCUBOOT=y

Question

Hi, 
 
 I have got the sample "samples/subsys/usb/mass" working on a nrf52840dk using the external flash, but as soon as I enable the mcuboot bootloader (CONFIG_BOOTLOADER_MCUBOOT=y) it does not work anymore. Has anyone got a MSD example working with the mcuboot bootloader enabled using the external flash as the storage device? 
 I use the NRF CONNECT SDK version v.2.3.0. Any help would be appreciated. 
 
 Kind Regards 
 
 Julian

sigvartmh · Answer

I haven't read through all of this case but could this solution be of help to you: 
 As this is merged: https://github.com/nrfconnect/sdk-nrf/pull/11802/ disk access API with partition manager will be resolved in the NCS 2.5 release. However if you want to start testing it out you can cherry-pick this patch. I made a prototype implementation for how you could potentially integrate parts of this into the build system see: https://github.com/sigvartmh/fw-nrfconnect-nrf-1/pull/38/ and here is the diff to the MSC sample in zephyr: diff --git a/samples/subsys/usb/mass/prj.conf b/samples/subsys/usb/mass/prj.conf
index 0954afcd0e..a8bc60848d 100644
--- a/samples/subsys/usb/mass/prj.conf
+++ b/samples/subsys/usb/mass/prj.conf
@@ -12,3 +12,4 @@ CONFIG_USB_MASS_STORAGE_LOG_LEVEL_ERR=y
 CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=n

CONFIG_MAIN_STACK_SIZE=1536
+CONFIG_PM_PARTITION_FATFS_DISK_NAME="NAND"
diff --git a/samples/subsys/usb/mass/src/main.c b/samples/subsys/usb/mass/src/main.c
index 0d8d6ba982..b40681ef76 100644
--- a/samples/subsys/usb/mass/src/main.c
+++ b/samples/subsys/usb/mass/src/main.c
@@ -28,8 +28,8 @@ LOG_MODULE_REGISTER(main);
 FS_LITTLEFS_DECLARE_DEFAULT_CONFIG(storage);
 #endif

-#define STORAGE_PARTITION storage_partition
-#define STORAGE_PARTITION_ID FIXED_PARTITION_ID(STORAGE_PARTITION)
+#define STORAGE_PARTITION fatfs_storage
+#define STORAGE_PARTITION_ID FIXED_PARTITION_ID(FATFS_STORAGE)

static struct fs_mount_t fs_mnt;

Mass Example with External Flash not working with CONFIG_BOOTLOADER_MCUBOOT=y

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