OT: utilsFlashWrite does not take into account the write-block-size

[jfischer-no]

OpenThread utilsFlashWrite does not take into account the write-block-size. OT uses a multiple of 4 while writing to the flash. This leads to a bus fault on a platform like K64F where write-block-size is 8.

Is it possible to abstract utilsFlash* over a file system like nffs?

[KaSroka]

File abstraction can be used to emulate flash for OpenThread - as example you can see posix OpenThread platform: https://github.com/openthread/openthread/blob/master/examples/platforms/posix/flash.c

We can also write our own settings module that uses file directly instead of flash: https://github.com/openthread/openthread/blob/master/examples/platforms/utils/settings.cpp

[carlescufi]

@jfischer-phytec-iot Sounds to me like we could write an abstraction over FCB or NFFS. Any takers to implement this in the 1.11 timeline?

[carlescufi]

@jfischer-phytec-iot are you going to give this a go?

[jfischer-no]

@carlescufi I do not know if I can find time for this issue before EW2018.

[nashif]

any update on this?

[rlubos]

I'll look into this issue. We need a better way to store OpenThread settings - it became an recurring problem recently (#12944, #13687).

[rlubos]

No longer an issue with #21796.