Linking error when you try to add TWI module to secure bootloader project

[Haaris]

I have an nrf52832 dev board with me and I'm using nRF5_SDK_15.0.0_a53641a SDK version. I'm using the project "pca10040_ble" inside the "secure_bootloader" folder from the "dfu" examples with segger IDE ( release v 4.16) . For application-specific reason, I wanted to have a TWI master functionality in my bootloader code. I was successfully able to add TWI module to this project and compile it. But when I add a function of TWI which writes to the slave device, then while compiling I'm getting this linker error : 

section .tdata overlaps absolute placed section .reserved_flash_tail

What my understanding from this error is that my application data is overlapping the reserved flash data. If this is the case then how do I change the size of reserved_flash data and what are the guidelines based on which I can change such that it does not lead to an error for other memory sections.

Thank you

[Simon]

I am sorry for the delay, I am currently looking into your issue and will try to provide you with an answer a soon as possible.

Best regards,

Simon

[Simon]

Try reducing the bootloader start address, it seems like there is not enough flash left.

Best regards,

Simon

[Haaris]

you mean I should reduce the address of FLASH_START or RAM_START??

Apart from your suggestion, I also tried just increasing the FLASH_SIZE from FLASH_SIZE 0x6012 to FLASH_SIZE=0x7012 and that seems to resolve the issue.  Now I understand that FLASH_SIZE should be less that FLASH_PH_SIZE -  FLASH_START. According to this tutorial : https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/adjustment-of-ram-and-flash-memory

But is there any specific reason the sdk example uses FLASH_SIZE to be 0x6012, while we can maximum FLASH_SIZE up to 0x8000 ??