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Locating costants at absolute memory address

Lucio Del

Hello everybody, I'm using a stm32 family device (stm32f4), it is possible to place constants at absolute memory address?
In my case R/O base starts from 0x0800 0000 and my code look like this:

#define USER_FLASH_STARTADDRESS    ((uint32_t)0x08000000)
#define OFF_DATA_1      0x400
#define OFF_DATA_2      0x401
#define OFF_DATA_3      0x402
#define OFF_DATA_4      0x403

#define POS_DATA_1                      (uint32_t)(USER_FLASH_STARTADDRESS+OFF_DATA_1)
#define POS_DATA_2                      (uint32_t)(USER_FLASH_STARTADDRESS+OFF_DATA_2)
#define POS_DATA_3                      (uint32_t)(USER_FLASH_STARTADDRESS+OFF_DATA_3)
#define POS_DATA_4                      (uint32_t)(USER_FLASH_STARTADDRESS+OFF_DATA_4)

const uint8_t variable1 __attribute__((at(POS_DATA_1))) = 'd';
const uint8_t variable2 __attribute__((at(POS_DATA_2))) = 'a';
const uint8_t variable1 __attribute__((at(POS_DATA_3))) = 't';
const uint8_t variable2 __attribute__((at(POS_DATA_4))) = 'a';

I've got no errors at compilations, and my program seems to run fine, but i want to be sure that this procedure is correct and safe.
Thank you very much.
Best regards

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