Error "Region 'SRAM' overflowed..." while testing the Bluetooth Throughput sample on nRF5340dk

[Jason Lei]

Hi,

I'm trying to implement the Bluetooth Throughput sample to nRF5340dk with nRF Connect SDK 1.4.1.

As mentioned in the README file, I added these three configs to the proj.conf file of the hci_rpmsg project:

CONFIG_BT_CTLR_TX_BUFFER_SIZE=251
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
CONFIG_BT_RX_BUF_LEN=255

Then I get this error when I try building the hci_rpmsg project in SES:

1> Linking ‘zephyr_prebuilt.elf’
1> Memory region         Used Size  Region Size  %age Used
1>            FLASH:      170404 B       256 KB     65.00%
1>             SRAM:       69944 B        64 KB    106.73%
1> c:/users/jasonlei/ncs/v1.4.1/toolchain/opt/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: zephyr\zephyr_prebuilt.elf section `noinit' will not fit in region `SRAM'
1> c:/users/jasonlei/ncs/v1.4.1/toolchain/opt/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: section .intList VMA [21010000,21010097] overlaps section noinit VMA [2100d580,21011137]
1> c:/users/jasonlei/ncs/v1.4.1/toolchain/opt/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: region `SRAM' overflowed by 4408 bytes
1> collect2.exe: error: ld returned 1 exit status
1>         IDT_LIST:         152 B         2 KB      7.42%
Build failed

Is there any idea for solving this?

[Jason Lei]

After reducing the HEAP_MEM_POOL_SIZE value from 8192 to 4096, this error is solved. 
I wonder if there's any side effect after this change.

[Simonr]

Hi

The HEAP_MEM_POOL_SIZE specifies the size of the heap memory pool used when dynamically allocating memory using k_malloc(), so you will have a reduced amount of memory to allocate like this with this reduced size.As of this commit, there is a build-time assert that checks if the heap memory configuration is sufficient, so 4096 should be sufficient seeing as you're able to build the project.

Best regards,

Simon