Where is the super simple boot loader and file up loader?

RE: Where is the super simple boot loader and file up loader?

AMarch — Tue, 08 Dec 2020 16:36:04 GMT

I am pretty sure in the project I have I needed to add nrf_dfu_serial_uart.c , since it wasn't there. I alsoneeded to add the uart drivers along with adjusting the sdk_config.h to configure them.

I got it operational, I was able to upload package through the DK virtual serial port. So that is good.

I am currently using the project in nRF5_SDK_16.0.0_98a08e2 . Perhaps the newer projects have this fleshed out more.

In any case, I believe I have part of my solution now, and I can move foreword. Again, thanks for dragging me back to the open_bootloader project by the nose.

RE: Where is the super simple boot loader and file up loader?

Nguyen Hoan Hoang — Tue, 08 Dec 2020 15:36:32 GMT

The UART is already there you don't need rip anything. Just change the sdk_config.h to disable USB and enable UART backend.

RE: Where is the super simple boot loader and file up loader?

AMarch — Tue, 08 Dec 2020 14:03:06 GMT

Also notable in this project, the baud rate of the USB device doesn't appear to be clearly specified, unless it doesn't matter.

I was going to test some back and forth over the USB UART port , and generally you specify a baud rate, one isn't listed, ill just have to try whatever.

RE: Where is the super simple boot loader and file up loader?

AMarch — Tue, 08 Dec 2020 13:59:35 GMT

Ok I am looking at the project and documentation , Kind of be nice if there was a README associated with it that explains the proper way to locate the target file to load into the firmware, but that is another issue.

This project (as stated in the documents) uses USB. So I assume to make it work totally serial, i need to

rip out the USB device drivers.
remove nrf_dfu_serial_usb.c from the project
add nrf_dfu_serial_uart.c to the project
probably some uart configuration in there

Assuming you or anyone has done this, does this seem reasonable?

RE: Where is the super simple boot loader and file up loader?

Nguyen Hoan Hoang — Tue, 08 Dec 2020 13:48:26 GMT

I compiled the USB version and it's about 32KB. There must be something wrong in your compiler settings may be. The host code can be found on Nordic Github in nRFConnect projects or nrfjprog project. I never looked inside those projects so don't know what's in there.

RE: Where is the super simple boot loader and file up loader?

AMarch — Tue, 08 Dec 2020 13:25:45 GMT

Yeah i knew i was going to regret posting this.

I looked at this project already, but dismissed it because the project was laden with all the nrf_Crypto folders. I built it and it showed 942KB of (91%) flash usage, which confused me.

Why does this project need any crypto libraries at all? Tracing through the build i see that it is still using crypto init. Seems to be using it for the hash function, is that all it is doing?

I'll take another look. I need to put this stuff on here to calm down or something.

Thanks for the re-direct.

Now I need to sift through this site and see if I can find where the host code to go along with this , might be.

Was that a blog post?

RE: Where is the super simple boot loader and file up loader?

Nguyen Hoan Hoang — Tue, 08 Dec 2020 04:49:12 GMT

There is a version of the Nordic bootloader that does not require encryption. It's in the SDK. You can use either USB or UART version and replace it with your SPI backend. Look in the SDK examples/dfu/open_bootloader folder.