How to change the top address of the app

[takashina hiroki]

SDK: 15.3.0
Example: ble_app_multirole_lesc
Device: EYSHJNZWZ (nRF52832)

I recognize by default that the top address of the app is 0x26000.
I want to change the top address of the app to 0x30000.
Therefore, I changed to the following setting (only "FLASH_START" was changed).

FLASH_PH_START = 0x0
FLASH_PH_SIZE = 0x80000
RAM_PH_START = 0x20000000
RAM_PH_SIZE = 0x10000
FLASH_START = 0x30000
FLASH_SIZE = 0xA0000
RAM_START = 0x20005000
RAM_SIZE = 0x20000

With this setting, I confirmed that the start address of the application was changed to 0x30000.
I also confirmed that the program counter would be 0x30000.
However, the app stops on the way.

Please tell us about the cause of this.

[Amanda Hsieh]

Hi, 

I want to change the top address of the app to 0x30000.

Why do you want to change to 0x30000?

The application should start at the top of the SoftDevice. There cannot be a gap between them. 

-Amanda H. 

[takashina hiroki]

Sorry, there was not enough explanation.
I want to split it into two applications.
Therefore, I have created two projects (Application-A and Application-B) and created the application separately.
I want to load Application-A and Application-B into their respective areas and run them as a single application.
Application-A uses the area from 0x26000 to 0x2FFFF.
Application-B uses the area from 0x30000 to 0x7FFFF.
* This thread is talking about Application-B.

SoftDevice first runs Application-A.
Application-A jumps to Application-B when certain conditions are met.
* Confirmed to jump to Application-B.
In that case, the above error occurred in Application-B.

[awneil]

takashina hiroki said:

I want to split it into two applications

Again, what is your goal in doing that? What are you hoping to achieve by doing that?

www.catb.org/.../smart-questions.html

[Amanda Hsieh]

Hi, 

Could the Application-B work without Application-A?

Do you use the project for pca10040?

-Amanda H.

[takashina hiroki]

>> Could the Application-B work without Application-A?
No.
Application-A has the role of jumping to Application-B.
SoftDevice first executes Application-A.
Therefore, Application-B cannot work without Application-A.

>> Do you use the project for pca10040?
Yes

[takashina hiroki]

I want to do DFU without using BootLoader.
I want Application-A to have the ability to rewrite Application-B.
Therefore, I want to manage the area separately for Application-A and Application-B.

I know that BootLoader can have DFU functionality.
However, I do not want to do DFU with BootLoader for various reasons.
Therefore, I am considering a method of doing DFU without using BootLoader.
As a way of doing that, I am thinking of dividing the area into Application-A and Application-B.

[takashina hiroki]

This problem has been resolved by calling "sd_softdevice_vector_table_base_set(0x30000)".
Thank you for answering.