SPD. Porting from DIMM memory stripe i²c device to buckle board Nor_flash

In the Initdram function of the/board/freescale/t104xrdb/ddr.c file

phys_size_t initdram (int board_type)

{

Phys_size_tdram_size;

#if defined (config_spl_build) | | !defined (CONFIG_RAMBOOT_PBL)

Puts ("initializing....usingspd\n");

Dram_size= Fsl_ddr_sdram ();

Dram_size = setup_ddr_tlbs (dram_size/0x100000);

Dram_size*= 0x100000;

#else

Dram_size= fsl_ddr_sdram_size ();

#endif

Returndram_size;

}

From the perspective of C language, the process of obtaining the SPD is essentially the process of assigning a value to the dram_size.

#############################################################

Drivers/ddr/fsl/main.c/fsl_ddr_sdram called the __fsl_ddr_compute function

Call the Le Fsl_ddr_compute function in the Drivers/ddr/fsl/main.c/__fsl_ddr_compute function

The function that obtains the SPD information is defined in the Fsl_ddr_compute function.

Case STEP_GET_SPD:

#if defined (CONFIG_DDR_SPD) | | Defined (Config_spd_eeprom)

/*step 1:gather All DIMM SPD data */

for (i = First_ctrl; I <= Last_ctrl; i++) {

FSL_DDR_GET_SPD (Pinfo->spd_installed_dimms[i],i,

Dimm_slots_per_ctrl);

}

#############################################################

The Drivers/ddr/fsl/main.c/fsl_ddr_compute function calls the

The Compute_lowest_common_dimm_parameters function.

Compute_lowest_common_dimm_parameters the function is defined in/DRIVERS/DDR/FSL/LS_COMMON_DIMM_PARAMS.C

In compute_lowest_common_dimm_parameters, the definition prints the detected Udimm 18ksf51272az-1g6k1 that is displayed at Uboot startup, with the following code:

#ifndef Config_spl_build

printf ("Detected Udimm%s\n",

Dimm_params[i].mpart);

#endif

############################################################

The Fsl_ddr_sdram_size function is defined under the/drivers/ddr/fsl/main.c file:

/*

* Fsl_ddr_sdram_size (FIRST_CTRL,LAST_INTLV)-This function is only returns the

* sizeof the total memory without setting DDR control registers.

*/

phys_size_t

Fsl_ddr_sdram_size (void)

{

fsl_ddr_info_t info;

Unsignedlong long total_memory = 0;

memset (&info,0, sizeof (fsl_ddr_info_t));

Info.mem_base = config_sys_fsl_ddr_sdram_base_phy;

Info.first_ctrl= 0;

Info.num_ctrls= Config_sys_fsl_ddr_main_num_ctrls;

Info.dimm_slots_per_ctrl= CONFIG_DIMM_SLOTS_PER_CTLR;

Info.board_need_mem_reset= NULL;

/* Compute it once normally. */

total_memory= Fsl_ddr_compute (&info, STEP_GET_SPD, 1);

Returntotal_memory;

}

The Fsl_ddr_compute function is defined under the same file, which calls the FSL_DDR_GET_SPD function on STEP1 to operate the I²C bus and obtain the SPD information on the DIMM memory strip, as follows:

/* STEP 1:gather all DIMM SPD data */

for (i = First_ctrl; I <= Last_ctrl; i++) {

FSL_DDR_GET_SPD (Pinfo->spd_installed_dimms[i],i,

Dimm_slots_per_ctrl);

}

So fsl_ddr_get_spd is the function that should be the focus of the transplant, or the FSL_DDR_GET_SPD function defined under the/drivers/ddr/fsl/main.c file.

void fsl_ddr_get_spd (generic_spd_eeprom_t *ctrl_dimms_spd,

unsigned int ctrl_num, unsigned int dimm_slots_per_ctrl)

{

}

This empty function is a function that needs attention.

SPD. Porting from DIMM memory stripe i²c device to buckle board Nor_flash