Writing UICR->APPROTECT with linker scripts

[hutorny]

GCC linker is capable to generate elf file with a given value for UICR->APPROTECT register with a simple script:

/* Linker script with read back protection . */

SEARCH_DIR(.)
GROUP(-lgcc -lc -lnosys)

MEMORY
{
  UICR (r)	 : ORIGIN = 0x10001000, LENGTH = 0x300
}

SECTIONS
{
  .uicr : AT(0x10001208) ALIGN(4)   
  {
	LONG(0xFFFFFF00)
  } > UICR 
} INSERT AFTER .text

INCLUDE "nrf52_ble_gcc.ld"

This feature allows generating "always protected firmware" in release configuration and unprotected in other configurations.

To use the script it should be refered in "-T" option of the linker step instead of the original script, e.g. -Tnrf52_ble_gcc_prot.ld

Perhaps, other toolchains have similar capabilities.

Please note, this example script is targeting nRF52 with SoftDevice. For other targets it may need some adjustments on the UICR addresses and the

[Jørgen Holmefjord]

Hi,

Thanks for posting the tip, we also have a UICR Config Example for Keil in the SDK.

Best regards,
Jørgen