FileSystem for NAND FLASH recommendation

[Dor Sadeh]

Any recommendation for a filesystem for nand flash?

My application uses zephyr on nrf85240 with a 128MB nand flash.

It samples sensors and streams their data to the flash device so write throughput and latency are critical.

Regards

[dejans]

Hi,

Please find related information in the discussions on these links:

devzone.nordicsemi.com/.../nrf52840-external-spi-nand-flash-fatfs
devzone.nordicsemi.com/.../external-nand-flash-with-nrf5340-non-spi
devzone.nordicsemi.com/.../suitable-filesystem-for-external-slc-nand-flash-memory

Best regards,

Dejan

[Dor Sadeh]

Thanks, I've decided to give little_fs a try.

But I'm having some trouble.

I was following the documentation here for configuring the partition:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/scripts/partition_manager/partition_manager.html#external-flash-memory-partitions 

For some reason I get an error regarding qspi nor, while there is no qspi nor used in the project. checking .config I see that qspi nor flash has been configured (CONFIG_NORDIC_QSPI_NOR=y) 

error message: ncs/zephyr/include/devicetree.h:305:40: error: 'DT_N_INST_0_nordic_qspi_nor_P_sck_frequency' undeclared here (not in a function) 305 | #define DT_INST(inst, compat) UTIL_CAT(DT_N_INST, DT_DASH(inst, compat))

Can't understand what caused for this undesired configuration

I'm using the nrf52840 with ncs 1.7.1

[Dor Sadeh]

this problem was caused by CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY config which is by default y when using external flash and mcuboot, which I'm using but not on external flash

[dejans]

Hi,

Are there any problems left? Could you share the current status?

Best regards,

Dejan

[Dor Sadeh]

I have successfully managed to mount littlefs on the external flash 

I needed to configure CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=n

the default for CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY is  y, which initiates a qspi nor flash configuration, which I don't have in my system, and therefore caused some trouble

[dejans]

Hi,

It is good to hear that your chosen file system is working on external flash.

Best regards,

Dejan