how to enable readback protection

Hi, Guys,

I am trying to enable the readback protection for the code region 0 and code region 1, I know that the NRF_UICR->RBPCONF register is flash_backed, so I have to include uicr_config.h file and uncomment the line
const uint32_t UICR_RBPCONF attribute((at(0x10001004))) attribute((used)) = 0xFFFF0000;

However, I use eclipse and gcc, so it seems the "at" keyword doesn't apply in eclipse gcc, so is there any equivalence in gcc or how should I enable this readback protection in the application but not using nrfgo, I know that the nrfgo can definitely do that. Thank you:)