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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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    Hello Wojciech,

    I see that there are some regions missing from your flashdump. Also, I see that the last data page is moved to a weird location, not page aligned. Do you have any idea of what is present in the flash in the area that is missing?

    That is between 0x00073FFF and 0x0007544B. It should have been included "between" line 1025 and 1026 in the flashdump. especially interesting is what that is present on 0x00074000, since this should be the start of a page.

    How many FDS pages do you use in your application? if there are more than 5, then 0x00075000 is also interresting. Actually, for N flash pages 0x0007(N+1)000 is interresting. The start of each page. Also, as I mentioned, I don't understand why DEADC0DE (DEC0ADDE) is present in a non-page-aligned place. Do you have a record where the actual data is DEADC0DE?

    I see the internal ticket that Jørgen created from your original post here on DevZone. There is still no conclusion. I also see from one of the other tickets that you created that you have some theory on why you may have a missing swap page. It is an interesting theory, but without seeing what in the missing part of the flashdump, it is difficult to say whether this actually is the issue in your case. 

    Also, you say that the chip has been running for a few months. Do you have any estimation on how much and how often you write and erase your flash? Or in other words, how often you perform the Garbage Collection?

    Best regards,
    Edvin

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  • 0

    Hello Wojciech,

    I see that there are some regions missing from your flashdump. Also, I see that the last data page is moved to a weird location, not page aligned. Do you have any idea of what is present in the flash in the area that is missing?

    That is between 0x00073FFF and 0x0007544B. It should have been included "between" line 1025 and 1026 in the flashdump. especially interesting is what that is present on 0x00074000, since this should be the start of a page.

    How many FDS pages do you use in your application? if there are more than 5, then 0x00075000 is also interresting. Actually, for N flash pages 0x0007(N+1)000 is interresting. The start of each page. Also, as I mentioned, I don't understand why DEADC0DE (DEC0ADDE) is present in a non-page-aligned place. Do you have a record where the actual data is DEADC0DE?

    I see the internal ticket that Jørgen created from your original post here on DevZone. There is still no conclusion. I also see from one of the other tickets that you created that you have some theory on why you may have a missing swap page. It is an interesting theory, but without seeing what in the missing part of the flashdump, it is difficult to say whether this actually is the issue in your case. 

    Also, you say that the chip has been running for a few months. Do you have any estimation on how much and how often you write and erase your flash? Or in other words, how often you perform the Garbage Collection?

    Best regards,
    Edvin

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