nrfjprog flash write placement when using --reset option

RE: nrfjprog flash write placement when using --reset option

dejans — Wed, 31 Aug 2022 12:15:51 GMT

Hi,

Do you use some kind of dynamic flash storage?

Best regards,
Dejan

RE: nrfjprog flash write placement when using --reset option

dejans — Thu, 19 May 2022 12:24:44 GMT

Hi,

I have made additional tests and got the same result as you when using Programmer application for memory visualization.
I have reported the issue internally.

Best regards,
Dejan

RE: nrfjprog flash write placement when using --reset option

dejans — Thu, 19 May 2022 09:27:29 GMT

Hi,

You might be right as application data is usually added just below the bootloader.

Regarding the issue, I have tested it myself.
First, I wrote hex file using Programmer application. Afterwards, I used nrfjrog to program the board using the same command that you provided (with --reset option).
I have not seen the problem that you described.

Best regards,
Dejan

RE: nrfjprog flash write placement when using --reset option

patjshan — Wed, 18 May 2022 13:09:35 GMT

I'm confused about how exactly this is effecting my issue. To be clear I only used the nrf connect programmer tool to read and capture the screenshots. Writing to the chip was done from the command line using nrfjprog.

can you explain more in depth how the flash page tags are being affected by the "--reset" option from the command line? when I leave this option out the hex file seems to load just fine but with it my application hangs.

RE: nrfjprog flash write placement when using --reset option

dejans — Mon, 16 May 2022 14:32:39 GMT

Hi,

In nRF5 SDK, there are flash page tags used with Flash Data Storage. Page tags are written when FDS is first initialized and additional data is written on the first boot.
It is recommended to have "Auto reset" ON when using Programmer application, as this prevents CPU from halting.

Best regards,
Dejan

RE: nrfjprog flash write placement when using --reset option

patjshan — Fri, 13 May 2022 15:11:01 GMT

sorry for the delay, for some reason I do not get notification/emails when my post has been responded to. The lower picture (name: nrfjprog-flash-error.png if you open in a new tab) is a screenshot of the flash layout after programming with nrfjprog using the --reset option to reset the chip automatically after programming. As you can see the application data has been offset from its intended position by quite a bit.

Alternatively the picture first picture (name: nrfjprog-flash-correct.png) shows the same board but after erasing the flash on the chip and using nrfjprog without the --reset option and you can see the application data is in the correct place just above the softdevice

RE: nrfjprog flash write placement when using --reset option

dejans — Tue, 12 Apr 2022 08:28:24 GMT

Hi,

Could you please provide more information about the pictures - what each one of them represent, which of them are correct and which not?

Best regards,
Dejan