fs_event_handler not called by sd

[Michal]

Hello,

We have been using FDS in our nrf52832 based product. Recently we had a need to port application to nrf52810. It required some flash memory optimization. Fortunate for us changing compilation optimization flags from -O0 to -Os and adding -flto got us enough Flash memory. Unfortunately it introduced a bug in our software where fds was returing error 8 (Queue full). After investigation I found out that fs_event_handler is not called and data is not saved in flash. I wonder what is actually happening ? I guess changing optimization could affect fs_event_handler as that is placed in sections - which is a bit of fragile module. But I don't get why flash page is not getting erased.

Thank you for any help.

Michal

[Einar Thorsrud]

Hi Michal,

Are you building with GCC? Which version? We have seen issues with link-time optimization and certain GCC versions (> 6), where the linker fails to include functions that are actually used. I suggest you test with GCC version 6.x.x to see if you still see the issue there.

[Michal]

Hi Einar. I am using GCC 6.3.1. Should I try lower version?

[Einar Thorsrud]

Hi,

I never saw this issue with GCC 6, so I suspect it is not relevant. Though we did see this issue with sections with GCC 7.x. Could you try an older GCC version, and perhaps also the latest (9-2020-q2-update) to see if it makes a difference? Which SDK version are you using?

[Michal]

Hi,

I will try that GCC. I am using SDK 15.3

[Einar Thorsrud]

Sounds good. It will be interesting to hear if that helps.