[coreboot] How to change config of SDRAM of intel mohonpeak EVB on coreboot?

[WANG FEI]

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&cd=3&cad=rja&uact=8&ved=0ahUKEwiMxt_PzrfNAhVQF8AKHQfkAJ8QFgg3MAI&url=https%3A%2F%2Fwww.micron.com%2F~%2Fmedia%2Fdocuments%2Fproducts%2Ftechnical-note%2Fdram-modules%2Ftn_04_42.pdf&usg=AFQjCNEBeya4qkEodTkCc1eEjuK5Qdz0YA&sig2=S9r0YXabVNhpO_UfzJqNpQ&bvm=bv.125221236,d.ZGg

On Wed, Jun 1, 2016 at 7:53 AM, 김유석 <poplinux0 at 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.
>
>
>
>
> --
> coreboot mailing list: coreboot at coreboot.org
> https://www.coreboot.org/mailman/listinfo/coreboot
>
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