Dear Sir.
My own product must need a change the value(config) of sdram. Such as size, speed, and etc.
So, I'm try to search and study the coreboot source code, and found out the "vendorcode/intel/fsp1_0/rangeley/include/fspplatform.h"
This header are contained the some structure for setup the sdram. such as "MEM_DOWN_DIMM_SPD_DATA;"
50 typedef struct { 51 UINT8 DRAMDeviceType; // 2 DRAM Device Type 52 UINT8 ModuleType; // 3 Module Type 53 UINT8 SDRAMDensityAndBanks; // 4 SDRAM Density and Banks 54 UINT8 SDRAMAddressing; // 5 SDRAM Addressing 55 UINT8 VDD; // 6 Module Nominal Voltage 56 UINT8 ModuleOrganization; // 7 Module Organization 57 UINT8 ModuleMemoryBusWidth; 94 UINT8 DramManufacturerIdLsb; // 148 DRAM Manufacturer ID Code, LSB 95 UINT8 DramManufacturerIdMsb; // 149 DRAM Manufacturer ID Code, MSB 96 } MEM_DOWN_DIMM_SPD_DATA;
So, I'm try to found **.c* source codes for check configuration point.
But, coreboot are not setup the argument of sdram.
I don't understand this sisution, Because sdram is must need a some configuration for use.
*Why? do not setup the argument of sd**ram ???
*** Please advise to me.
Thank you.
YuSeok,
It looks your platform has enabled the Memory Down function.
The MEM_DOWN_DIMM_SPD_DATA structure supposed to be filled with the relative DIMM SPD data as described in comments, for example,
DRAMDeviceType =>>> SPD Byte Offset 2 ModuleType =>>> SPD Byte offset 3 DramManufacturerIdLsb =>>> SPD Byte offset 148
To have a look at below links to understand the DDR3's SPD details.
http://www.simmtester.com/page/news/showpubnews.asp?num=153
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&a...
On Wed, Jun 1, 2016 at 7:53 AM, 김유석 poplinux0@gmail.com wrote:
Dear Sir.
My own product must need a change the value(config) of sdram. Such as size, speed, and etc.
So, I'm try to search and study the coreboot source code, and found out the "vendorcode/intel/fsp1_0/rangeley/include/fspplatform.h"
This header are contained the some structure for setup the sdram. such as "MEM_DOWN_DIMM_SPD_DATA;"
50 typedef struct { 51 UINT8 DRAMDeviceType; // 2 DRAM Device Type 52 UINT8 ModuleType; // 3 Module Type 53 UINT8 SDRAMDensityAndBanks; // 4 SDRAM Density and Banks 54 UINT8 SDRAMAddressing; // 5 SDRAM Addressing 55 UINT8 VDD; // 6 Module Nominal Voltage 56 UINT8 ModuleOrganization; // 7 Module Organization 57 UINT8 ModuleMemoryBusWidth;
94 UINT8 DramManufacturerIdLsb; // 148 DRAM Manufacturer ID Code, LSB 95 UINT8 DramManufacturerIdMsb; // 149 DRAM Manufacturer ID Code, MSB 96 } MEM_DOWN_DIMM_SPD_DATA;
So, I'm try to found **.c* source codes for check configuration point.
But, coreboot are not setup the argument of sdram.
I don't understand this sisution, Because sdram is must need a some configuration for use.
*Why? do not setup the argument of sd*
*ram ??? * Please advise to me.
Thank you.
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WANG FEI -
김유석