[coreboot] MRC in coreboot

[Antony AbeePrakash X V]

Hi All,

We are able to achieve the memory initialization time reduction. Now we have achieved the boot time as 5sec until the Postcode 0xf8 (entry into Elf boot).

We have reduced the unwanted codes. We would like to reduce the boot time to less than 2sec.

Could anyone please tell what can be done further ?

Thanks,
Antony

-----Original Message-----
From: Aaron Durbin [mailto:adurbin at google.com]
Sent: Wednesday, September 05, 2018 7:39 PM
To: Antony AbeePrakash X V <AntonyAbee.PrakashXV at LntTechservices.com>
Cc: Coreboot <coreboot at coreboot.org>
Subject: Re: [coreboot] MRC in coreboot

On Wed, Sep 5, 2018 at 8:06 AM Antony AbeePrakash X V <AntonyAbee.PrakashXV at lnttechservices.com> wrote:
>
> Hi,
>
>
>
> We are developing coreboot for Apollo lake custom board.  MRC training data save is enabled in FSP using Binary configuration tool.
>
>
>
> But we are getting logs like,
>
>
>
> No MRC cache found.
>
> MRC SeCUmaSize memory size from SeC ... 0
>
> MRC Parameters not valid. Status is Success
>
> MRC:CpuMemoryTest Successful!
>
> Saving MRC data using CSE through HECI interface

I have never seen this path used in coreboot. This line above is saying CSE is responsible for saving and retrieving training data. In coreboot we use the main processor to save and restore. I suggest reading over the UPD parameters and ensure they match with our typical use cases. BCT tool enabling 'training data save' sounds like it's enabling CSE path.

>
> Try to find MRC training data HOB.
>
> No MRC training data found, perform data save via HECI.
>
> Saved MRC training data with status (0x80000003)
>
>
>
> It seems that MRC data is not found and saved. Also I found that there are options to add MRC file path and mrc.bin in menuconfig. The only option I have is save cached MRC settings.
>
>
>
> What this mrc.bin will do?
>
> How to add the mrc.bin in coreboot?
>
>
>
> Please explain on this.
>
>
>
> Thanks & Regards,
>
> Antony
>
>
>
> L&T Technology Services Ltd
>
> www.LntTechservices.com
>
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