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

[dejans]

Hi,

I have noticed that you are using NAND flash device for which we have no support. If you intend to use QSPI, note that QSPI peripheral does not support NAND devices (for both XIP and EasyDMA modes). However, you could use custom instructions for that. 

You could also look at 
devzone.nordicsemi.com/.../305866
devzone.nordicsemi.com/.../297544

Best regards,

Dejan

[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