How to use FATFS with partition manager?

[yang.hu]

Hi,

I'm using NCS 2.2.0, based on nRF5340 custom board.

My board has a spi nor flash, and i want to use Fatfs to save some sensor data.

I add FATFS to my project without partition manager, it is running, and i can see the file can be opened and closed.

But it is break running while i add Partition Manager to my project.

I debug it, and find the fault is "Get a wrong device when FS mount".

---------------------------------------------------------------------

In my .config file, i can ensure that spi nor flash drive and Partition Manager are added 

CONFIG_PARTITION_MANAGER_ENABLED=y
CONFIG_SPI=y
CONFIG_SPI_NOR=y
CONFIG_FLASH=y
CONFIG_FLASH_HAS_DRIVER_ENABLED=y

FATFS mount debug details is as follow:

- Thread  call stack

- FATFS mount

- wrong device

- zephyr.map

- my project.config

# low power
CONFIG_PM=y
CONFIG_PM_DEVICE=y

# flash
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y

# spi nor
CONFIG_SPI=y
CONFIG_SPI_NOR_IDLE_IN_DPD=y
CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096

# FATFS
CONFIG_FILE_SYSTEM=y
CONFIG_FAT_FILESYSTEM_ELM=y
CONFIG_DISK_DRIVER_FLASH=y
CONFIG_FS_FATFS_MAX_SS=4096

# fs_dirent structures are big.
CONFIG_MAIN_STACK_SIZE=2048

- partitions.yml

So, how to use FATFS with partition manager?

Best regards,

Yang

[Amanda Hsieh]

Hi, 

You could enable CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK in the prj.conf. Check out External flash memory partitions. 

Regards,
Amanda H.

[yang.hu]

Hi, Amanda H

I was added `CONFIG_PM_PARTITION_REGION_NVS_STORAGE_EXTERNAL=y` to my prj.conf, also `CONFIG_NVS=y` and `CONFIG_NVS_LOOKUP_CACHE=y` has benn select.

But it also select the wrong device, see debug details as follow:

I want to add FATFS to my project,

are you sure i should add `CONFIG_PM_PARTITION_REGION_NVS_STORAGE_EXTERNAL=y` to my prj.conf?

In define device step, i thing it get a wrong device, see here:

There are pm_config file:

Regards,

Yang

[Amanda Hsieh]

Hi, 

yang.hu said:

I was added `CONFIG_PM_PARTITION_REGION_NVS_STORAGE_EXTERNAL=y` to my prj.conf, also `CONFIG_NVS=y` and `CONFIG_NVS_LOOKUP_CACHE=y` has benn select.

Remove those configs. 

I correct my answer:

You need to set the CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK=y in your project config file. Check out External flash memory partitions

• If the external flash device is not using the QSPI NOR driver, you must enable CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK to override the Partition Manager’s external flash driver check, and the required driver must also be enabled for all applications that need it.

-Amanda H.

[yang.hu]

Hi,

I removed that configs, and added `CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK=y` in prj.conf

But i still have this problem.

`disk_access_write()` gets soc flash not spi ext flash.

[yang.hu]

Hi, Amanda Hsieh

About 'FATFS chose the wrong device while using Partition Manager', i think it is a multiple file system compatibility probleam.

As i said, this PR only add that using Partition Manager which is LittleFS, NVS and Setting.

Therefore, FATFS is ignored.

Where should it get area_id from Partition Manager instead of DTS.

There are two steps to solving this problem:

1. Adding pm.yml file to generate FATFS partitions.

2. Change the interface it used to get flash_disks.area_id.

Regards,

Hu Yang

[yang.hu]

Hi, Amanda Hsieh

Can you identify the problem and the corresponding solution?

 

[Amanda Hsieh]

Hi, 

Sorry for the dealy. I am checking with the internal and waiting for the reply. I will update you if I have anything. 

-Amanda H.