How can I read the UICR register of 9160?

Question

The current project needs to save the ID in the programmable register and use the ID in the application image. 
 So I save the ID number in the URCI->OTP[0] register. When I read the ID in URCI->OTP[0] in the main function of the application image , a fatal error occurred. 
 uint32_t get_id_from_uicr(){
 uint32_t id;
 id = (NRF_UICR_S->OTP[0]);
 return id;
} 
 As far as I know, UICR can only be read in secure code. 
 So I execute this code in the main function of spm and get the ID normally. How can I pass the ID to the application image(not via flash)? 
 Or is there any other better way to store this ID? 
 spm.c: 
 uint32_t get_id_from_uicr(){
 uint32_t id;
 id = (NRF_UICR_S->OTP[0]);
 return id;
}

void main(void)
{
 uint32_t id;
 id = get_imei_from_uicr();
	spm_config();
	spm_jump();
}

flaik-wayne · Answer

Hi xinjiang - the problem is that OTP memory must be read in 32 bit words. Simply adding the OTP memory to the `ranges` in spm_request_read_nse isn't enough - I used code like this: __TZ_NONSECURE_ENTRY_FUNC
int spm_request_read_nse(void *destination, uint32_t addr, size_t len)
{
	static const struct read_range ranges[] = {

#ifdef PM_MCUBOOT_ADDRESS
 /* Allow reads of mcuboot metadata */
 {.start = PM_MCUBOOT_PAD_ADDRESS,
 .size = PM_MCUBOOT_PAD_SIZE},
#endif
 {.start = FICR_INFO_ADDR,
 .size = FICR_INFO_SIZE},
#if defined(FICR_NFC_TAGHEADER0_MFGID_Msk)
 {.start = FICR_NFC_ADDR,
 .size = FICR_NFC_SIZE},
#endif
 {.start = FICR_RESTRICTED_ADDR,
 .size = FICR_RESTRICTED_SIZE},

// Allow reading UICR
 {.start = NRF_UICR_S_BASE,
 .size = 4096},
	};

if (destination == NULL || len <= 0) {
 return -EINVAL;
	}

if (ptr_in_secure_area((intptr_t)destination)) {
 return -EINVAL;
	}

for (size_t i = 0; i < ARRAY_SIZE(ranges); i++) {
 uint32_t start = ranges[i].start;
 uint32_t size = ranges[i].size;

if (addr >= start && addr + len <= start + size)
 {
 if ((addr & 3) == 0 && (len & 3) == 0)
 {
 // use 32 bit copy
 uint32_t *d = destination;
 uint32_t *s = (uint32_t)addr;
 while (len)
 {
 *d++ = *s++;
 len -= 4;
 }
 }
 else
 {
 memcpy(destination, (const void *)addr, len);
 }
 return 0;
 }
	}

return -EPERM;
}

How can I read the UICR register of 9160?

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