File write (-22) using External flash zephyr

RE: File write (-22) using External flash zephyr

Amanda Hsieh — Tue, 21 Apr 2026 12:45:24 GMT

Happy to know you fixed it. 🙂

RE: File write (-22) using External flash zephyr

fshaikh — Mon, 20 Apr 2026 20:06:02 GMT

Hi,

I was able to fix this by adjusting my device tree definition.

Specifically, the size definition in the spi2 section was set using bytes instead of bits.

Once I changed the bytes to bits, the write error went away.

The size of the memory is around 32 MB and when I was setting the size inside the device tree, it was reading as 4 MB, so there was a mismatch.

The new size I set was 0x10000000 in bits, which reads as 32MB

RE: File write (-22) using External flash zephyr

Amanda Hsieh — Thu, 16 Apr 2026 18:36:03 GMT

Hi Faheem,

[quote user=""][00:02:39.928,985] <inf> littlefs: sizes: rd 16 ; pr 256 ; ca 256 ; la 128 [00:02:39.943,023] <wrn> main: Filesystem recovery complete [00:02:40.177,398] <err> fs: file write error (-22)[/quote]

It seems that these sizes are wrong. -22 means invalid argument.

Please refer to the littlefs sample for fs_write and nrf52840dk_nrf52840_spi.overlay for setting sizes, or use configs to set sizes.

Regards,
Amanda H.