[edk2-devel] [edk2] Smbuslib and SmbusPpi

[Liming Gao]

Tiger:
   Yes. Quark SmBusLib is the real library instance. Mde SmBusLib bases on PPI. Platform can decide to implement the real SmbusLib library instance or provide SmbusPPI implementation.

Thanks
Liming
From: devel at edk2.groups.io [mailto:devel at edk2.groups.io] On Behalf Of Tiger Liu(BJ-RD)
Sent: Monday, November 04, 2019 1:04 PM
To: Gao, Liming <liming.gao at intel.com>; devel at edk2.groups.io
Subject: Re: [edk2-devel] [edk2] Smbuslib and SmbusPpi

Hi, Liming:
I found two smbuslib implemented in below path:

1.  edk2-platforms\Silicon\Intel\QuarkSocPkg\QuarkNorthCluster\Library\SmbusLib

I named this smbuslib as quark-smbuslib

2.       MdePkg\Library\PeiSmbusLibSmbus2Ppi\
I name this smbuslib as Mde-smbuslib

My questions are:

1.       Quark-smbuslib provided some basic smbus operation functions, and these functions could be called by some PEIMs/Dxe drivers

So, it means not needed to implement gEfiPeiSmbus2Ppi for PEI phase?

(because quark-smbuslib has provided needed functions)

2.       Mde-smbuslib will consume gEfiPeiSmbus2PpiGuid
This smbuslib is independent , and just uses gEfiPeiSmbus2Ppi to encapsulate some functions.
So, a BIOS provider should implement a gEfiPeiSmbus2Ppi for PEI phase?

Thanks
发件人: Gao, Liming <liming.gao at intel.com<mailto:liming.gao at intel.com>>
发送时间: 2019年11月4日 11:31
收件人: devel at edk2.groups.io<mailto:devel at edk2.groups.io>; Tiger Liu(BJ-RD) <TigerLiu at zhaoxin.com<mailto:TigerLiu at zhaoxin.com>>
主题: RE: [edk2-devel] [edk2] Smbuslib and SmbusPpi

SmbusPpi is defined in PI spec. SmbusLib is defined in Edk2 MdePkg.

Edk2 PEIM can base on SmBusLib. SmBusLib implementation wraps SmBusPpi.

Thanks
Liming
From: devel at edk2.groups.io<mailto:devel at edk2.groups.io> [mailto:devel at edk2.groups.io] On Behalf Of Tiger Liu(BJ-RD)
Sent: Thursday, October 31, 2019 6:51 PM
To: devel at edk2.groups.io<mailto:devel at edk2.groups.io>; Gao, Liming <liming.gao at intel.com<mailto:liming.gao at intel.com>>
Subject: [edk2-devel] [edk2] Smbuslib and SmbusPpi

Hi, Liming:
I have a question about smbus access during pei phase.

I found there was not smbus ppi reference implementation in edk2-platform code base.
And there was a SmbusLib reference implementation lib.

So, PEIMs usually use functions provided by SmbusLib?
Not use PeiSmbusPpi’s interface functions?

Thanks

Best wishes,

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