nRF9160: Assigning variables to RAM slots

[paul.lander]

Hi,

In one module of an application I would like to statically declare a large buffer in SRAM:  static uint8_t largeBuffer[65536];

The application fails to link with the following error:

/opt/toolchains/zephyr-sdk-0.11.1/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/9.2.0/../../../../arm-zephyr-eabi/bin/ld: region `SRAM' overflowed by 62972 bytes

For the nRF9160, is there a reference for how to assign variables to SRAM slots, allowing modules to manage their own encapsulated static data?

Thanks,

Paul

[Håkon Alseth]

Hi,

 

For the nRF9160, is there a reference for how to assign variables to SRAM slots, allowing modules to manage their own encapsulated static data?

The non-secure region has 128 kB flash available to the application. Based on the output from the linker, you are overflowing the region with ~62kB: 

/opt/toolchains/zephyr-sdk-0.11.1/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/9.2.0/../../../../arm-zephyr-eabi/bin/ld: region `SRAM' overflowed by 62972 bytes

Placing it in another region will not help here, as you're using up all the RAM.

 

Kind regards,

Håkon