Editing the XML linker script.

RE: Editing the XML linker script.

Håkon Alseth — Mon, 24 Apr 2023 10:56:27 GMT

Hi,

[quote user="Chriis"]Pretty vague, byte alignement from what?[/quote]

This follows the architecture. 4 bytes are normal on a 32 bit system.

[quote user="Chriis"]What is loaded? When is a section loaded?[/quote]

Should the data be initialized? Or should it not?

[quote user="Chriis"]Can you explain this one in different words? or with example?[/quote]

Global variables that are initialized will have the initial value loaded from flash into the RAM location.

ie: uint32_t g_variable = 0xVALUE;

The "0xVALUE" will then be loaded from a non-volatile area (Flash) into RAM in the boot-up sequence (start up files).

More information about linker scripts and startup sequences can be found here: https://interrupt.memfault.com/blog/how-to-write-linker-scripts-for-firmware

[quote user="Chriis"]

Now I have done this. Is this a valid region for my goal?

I want to save sensor data there, copy and paste every few minutes. I don't want any other data to go in that region. This is so I can save my important data in RAM region 1 so I can dissable all other RAM regions when the chip is not powered.

[/quote]

Do you have a hard requirement on where it should be located? if no, then just declare a buffer of your wanted size.

If you need this data to be absolute located, please see the former link:

[quote user="hkn"] Placing data at a specific memory address with Segger Embedded Studio [/quote]

Kind regards,

Håkon

RE: Editing the XML linker script.

Chriis — Fri, 21 Apr 2023 13:33:30 GMT

Hey,

"alignment: The required alignment of the program section; a decimal number specifying the byte alignment."

Pretty vague, byte alignement from what?

"load: If Yes, the section is loaded. If No, the section isn't loaded."

What is loaded? When is a section loaded?

keep: If Yes, the section will be kept even if none of the symbols are referenced by the rest of the program.

Can you explain this one in different words? or with example?

Now I have done this. Is this a valid region for my goal?

RE: Editing the XML linker script.

Håkon Alseth — Fri, 21 Apr 2023 13:16:14 GMT

Hi,

Section placement in Segger Embedded Studio is documented here:

https://studio.segger.com/index.htm?https://studio.segger.com/ide_section_placement_file_format.htm

Could this post be similar to what you're looking for?

Placing data at a specific memory address with Segger Embedded Studio

Kind regards,

Håkon