AM2732-Q1: How to specify the allocation of data to a certain memory space?

Hi Miles,

You can use the combination of the __attribute__() and the matching linker.cmd to accomplish it:

In your application code,

/* .dataSec has to be defined in linker.cmd */
uint8_t gDataBuf[DATA_BUF_SIZE] __attribute__((aligned(128), section(".dataSec")));

In your linker.cmd,

SECTIONS
{

...

.dataSec : {
} > R5F_TCMA

...

}

Best regards,

Ming

Sure, so which of these spaces can I use to store my own defined struct data?

DSS_L2 00800000 00060000 0005f139 00000ec7 RWIX
HWA_RAM 82000000 00020000 00000000 00020000 RWIX
DSS_L3_RSV 88000000 00008000 00000000 00008000 RWIX
DSS_L3 88008000 00388000 00386ca8 00001358 RWIX
RTOS_NORTOS_IPC_SHM_M c5000000 00001f40 00001c80 000002c0 RWIX

If I place some data structures into L3, then the compiled bin file will become much larger. It has increased from the original 470KB to the current 3812kB.

	uint8_t arrayToAntMapping[48]   __attribute__((aligned(1)))=	{23, 15, 22, 14, 21, 13, 20, 12,19, 11, 47, 7, 46, 6,45, 5,44, 4, 43, 3,
																				16,8,40,0,
																				17,9,41,1,
																				24,
																				18,10,42,2,
																				25,
																				32,
																				26,
																				33,
																				31,30,29,28,27,
																				34,
																				39,38,37,36,35};

				uint8_t mbazimSamplesind[20]   __attribute__((aligned(1)))=   {0,2,4,6,16,18,24,26,30,32,35,36,39,40,51,52,59,60,65,66};
				uint8_t sum[47]  __attribute__((aligned(1)))={1,3,5,7,8,9,10,11,12,13,14,15,17,19,20,21,22,23,25,27,28,29,31,33,34,37,38,41,42,43,44,45,46,47,48,49,50,53,54,55,56,57,58,61,62,63,64};
				uint8_t sum1[47]  __attribute__((aligned(1)))={11,10,10,12,6,10,4,10,4,12,4,12,10,10,6,12,6,12,14,14,8,10,10,10,11,12,13,16,17,16,17,14,15,14,15,14,15,16,17,16,17,16,17,18,19,18,19};
				uint8_t sum2[47]  __attribute__((aligned(1)))={10,9,8,9,4,7,3,6,2,7,1,6,5,4,2,5,1,4,7,6,1,3,2,1,1,1,1,5,5,4,4,3,3,2,2,1,1,3,3,2,2,1,1,2,2,1,1};

#pragma DATA_ALIGN(sum, 1U);
#pragma DATA_SECTION(sum, ".l3ram");
#pragma DATA_ALIGN(sum1, 1U);
#pragma DATA_SECTION(sum1, ".l3ram");
#pragma DATA_ALIGN(sum2, 1U);
#pragma DATA_SECTION(sum2, ".l3ram");
#pragma DATA_ALIGN(mbazimSamplesind, 1U);
#pragma DATA_SECTION(mbazimSamplesind, ".l3ram");
#pragma DATA_ALIGN(arrayToAntMapping, 1U);
#pragma DATA_SECTION(arrayToAntMapping, ".l3ram");

Hi Ming,

    Another question, for instance, I have an array that occupies 1024 bytes of space. When I switch from L2 to L3 space, I notice that the occupation in L3 increases by 1024 bytes, but the space in L2 does not decrease by 1024 bytes; it only decreases by 268 bytes. Why is this the case?

Best Regards,

Miles