how to set iRom and iRam address

RE: how to set iRom and iRam address

Vidar Berg — Tue, 10 Nov 2020 08:43:15 GMT

Hi Martin,

The Bootloader is a complete standalone application with the two main responsibilities being handling of DFUs and validation&booting of the main app. Please take a look at the "Dual-bank and single-bank updates" section of the bootloader documentation for a better illustration of this. Notice how the main application is placed right above the Softdevice (ie bluetooth stack).

[quote user="martinly77"]So should I select other example to start from? [/quote]

Yes, support for DFU can be added later. I would generally recommend starting development on the main application first. When you have a working app and is ready DFU support, I recommend you go start with reading this blog post: https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader

Best regards,

Vidar

RE: how to set iRom and iRam address

DYNAMICTOYS — Mon, 09 Nov 2020 22:18:48 GMT

HI Vadar,

Our application on this nrf52840 need DFU and that is why I choose this example to start from.

But the setting start from 0xF8000 which is bootloader address and size is limited.

So should I select other example to start from?

But add the DFU function later? But how?

Thanks!

Martin

RE: how to set iRom and iRam address

DYNAMICTOYS — Mon, 09 Nov 2020 18:54:13 GMT

Hi Vidar,

From the example code SurfBoard_nrf52_SDK_1702\examples\dfu\secure_bootloader\pca10056_s140_ble\arm5_no_packs

it has set iRom as

0xF8000 size : 0x6000

This size is very small, if I change size to bigger like 0x10000, it will step on MBR area and compile error.

So it is very confused.

From other post like here

https://devzone.nordicsemi.com/f/nordic-q-a/23237/what-is-the-recommended-irom-iram-setup-for-s140-5-0-0-3-alpha

it should set to 0x22000 and size DE000

By this setting, my code can compile but it do not run after download. Once start debug, it will enter HardFault_handler

So what is the actual setting of iRom and iRam?

Thanks!

Martin

RE: how to set iRom and iRam address

Vidar Berg — Thu, 05 Nov 2020 11:16:07 GMT

Hi,

SDK v17.0.2 is compatible with s140 v7.2.0 as can be seen from the compatibility matrix here: SDKs and SoftDevices. This Softdevice is also included in the SDK and it can be programmed to the board by using the flash Softdevice target in the Keil project, please refer to the "Running examples that use a SoftDevice" section of the SDK getting started guide for more details.

Softdevice flash target

It's fine to use the project's default IRAM and IROM setting. The default memory layouts for devices that include the bootloader are illustrated here link.

Best regards,

Vidar