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FDS - missing swap page

Wojciech Jasko

 Hi,

One of our devices is bricked due to the fds_init returning FDS_ERR_NO_PAGES. After flash analysis, I have discovered that all pages are marked as FDS_PAGE_DATA (no FDS_PAGE_SWAP). One of these pages is erased (just FDS_PAGE_TAG_MAGIC and FDS_PAGE_DATA header).

In our application, FDS is heavily used. During testing, we perform many power cycles. I do not have any clear reproduction path due to the fact that we found it just once (more than 200 devices online for a few months).

We are using SDK 14.2.0 with nRF52832 (custom board designs).

FDS flash dump can be found here: https://drive.google.com/drive/folders/1y_KOyIhVw9d-ZAAIc8SSa8k9vUOobDVz?usp=sharing

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    I understand. However, I would say that anything is better than just passing the NO_SWAP into APP_ERROR_CHECK, which will preform a reset, run into the same check after reboot, and continue in that loop. 

    Of course, not knowing what caused the issue in the first place is a bit worrying. If it is caused by a power cut during a certain point of Garbage Collection (GC), then you will probably have the situation where you have a data page that is blank. (However, I don't see any specific reason why this would have happened due to a power cut during GC.)

    But if you want a workaround, it needs to end up getting a new swap page. Maybe you can modify the GC function to copy all valid (not dirty/marked as deleted) records from e.g. the first data page to the current data page. That is, have a special GC function that empties all the records on the first data page. When finished, delete this page and mark it as a swap page.

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  • 0

    I understand. However, I would say that anything is better than just passing the NO_SWAP into APP_ERROR_CHECK, which will preform a reset, run into the same check after reboot, and continue in that loop. 

    Of course, not knowing what caused the issue in the first place is a bit worrying. If it is caused by a power cut during a certain point of Garbage Collection (GC), then you will probably have the situation where you have a data page that is blank. (However, I don't see any specific reason why this would have happened due to a power cut during GC.)

    But if you want a workaround, it needs to end up getting a new swap page. Maybe you can modify the GC function to copy all valid (not dirty/marked as deleted) records from e.g. the first data page to the current data page. That is, have a special GC function that empties all the records on the first data page. When finished, delete this page and mark it as a swap page.

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