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From: "Liming Gao" <liming.gao@intel.com>
To: "devel@edk2.groups.io" <devel@edk2.groups.io>,
	"tigerliu@zhaoxin.com" <tigerliu@zhaoxin.com>
Subject: Re: [edk2-devel] [edk2] Smbuslib and SmbusPpi
Date: Mon, 4 Nov 2019 05:09:15 +0000	[thread overview]
Message-ID: <4A89E2EF3DFEDB4C8BFDE51014F606A14E536CC5@SHSMSX104.ccr.corp.intel.com> (raw)
In-Reply-To: <5fa8fc0dea7543b1b72c9f1919830359@zhaoxin.com>

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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@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of Tiger Liu(BJ-RD)
Sent: Monday, November 04, 2019 1:04 PM
To: Gao, Liming <liming.gao@intel.com>; devel@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@intel.com<mailto:liming.gao@intel.com>>
发送时间: 2019年11月4日 11:31
收件人: devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Tiger Liu(BJ-RD) <TigerLiu@zhaoxin.com<mailto:TigerLiu@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@edk2.groups.io<mailto:devel@edk2.groups.io> [mailto:devel@edk2.groups.io] On Behalf Of Tiger Liu(BJ-RD)
Sent: Thursday, October 31, 2019 6:51 PM
To: devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Gao, Liming <liming.gao@intel.com<mailto:liming.gao@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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本邮件含有保密或专有信息,仅供指定收件人使用。严禁对本邮件或其内容做任何未经授权的查阅、使用、复制或转发。
CONFIDENTIAL NOTE:
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  reply	other threads:[~2019-11-04  5:09 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04  5:03 [edk2-devel] [edk2] Smbuslib and SmbusPpi Tiger Liu(BJ-RD)
2019-11-04  5:09 ` Liming Gao [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-11-04  6:10 Tiger Liu(BJ-RD)
2019-10-31 10:51 Tiger Liu(BJ-RD)
2019-11-04  3:30 ` Liming Gao

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