nRF52832 Bootloader at end of Flash memory

RE: nRF52832 Bootloader at end of Flash memory

beemavishnu — Sat, 25 May 2019 05:46:41 GMT

Thank you for your inputs.

Yes, its getting overlapped. I tested and I am getting FDS_ERR_NO_SPACE_IN_FLASH error.

RE: nRF52832 Bootloader at end of Flash memory

Sigurd — Fri, 24 May 2019 15:25:44 GMT

[quote userid="78085" url="~/f/nordic-q-a/47387/nrf52832-bootloader-at-end-of-flash-memory/188335"]Whether this will reserve flash between Start & End.[/quote]

That is where in flash that instance of fstorage will store data. BUT, fstorage makes no effort to ensure that different instances operate on non-overlapping flash memory regions. It is up to the users to ensure that their usage of the module does not disrupt others'.

[quote userid="78085" url="~/f/nordic-q-a/47387/nrf52832-bootloader-at-end-of-flash-memory/188335"]2) Assume start & end in fstorage as 96th page start address and 128th page End address. Later if I initialize fds_init() whether data records are stored below 96th page or it will overlap fds records with fstorage[/quote]

Yes, you will get overlap. The fstorage instance that fds uses as backend will not be aware of the other fstorage instance.(FDS will by default use the 3 last pages(FDS_VIRTUAL_PAGES) in this case.)

RE: nRF52832 Bootloader at end of Flash memory

beemavishnu — Tue, 21 May 2019 15:06:53 GMT

Hi,

In my code I am using both "Flash Storage" and "Flash Data Storage".

1) Assume there is no boot loader, but as part of nrf_fstorage_init(), in 'fstorage' we give start & end address of Flash. Whether this will reserve flash between Start & End.

2) Assume start & end in fstorage as 96th page start address and 128th page End address. Later if I initialize fds_init() whether data records are stored below 96th page or it will overlap fds records with fstorage.

Thanks & Regards

Vishnu Beema

RE: nRF52832 Bootloader at end of Flash memory

Sigurd — Tue, 21 May 2019 14:11:25 GMT

Hi,

Using a bootloader is optional, if you don't use one, the FDS/fstorage will storage the data records at the end of flash. If you use a bootloader, fstorage/fds will store the data below the bootloader area. Ths fds detects if there is booloader present or not in a internal function called flash_bounds_set(), so you don't need to manually configure that.

RE: nRF52832 Bootloader at end of Flash memory

beemavishnu — Tue, 21 May 2019 13:30:07 GMT

Any inputs on above query.