From: "Ni, Ruiyu" <ruiyu.ni@intel.com>
To: Laszlo Ersek <lersek@redhat.com>,
"Justen, Jordan L" <jordan.l.justen@intel.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Anthony Perard <anthony.perard@citrix.com>,
Julien Grall <julien.grall@linaro.org>
Cc: "edk2-devel@lists.01.org" <edk2-devel@lists.01.org>,
Kevin O'Connor <kevin@koconnor.net>,
Gerd Hoffmann <kraxel@redhat.com>,
David Woodhouse <dwmw2@infradead.org>
Subject: Re: Drop CSM support in OvmfPkg?
Date: Mon, 17 Dec 2018 10:44:30 +0000 [thread overview]
Message-ID: <734D49CCEBEEF84792F5B80ED585239D5BF61929@SHSMSX104.ccr.corp.intel.com> (raw)
In-Reply-To: <c263b94f-e0cf-210d-0699-0067e2184c7a@redhat.com>
> -----Original Message-----
> From: Laszlo Ersek <lersek@redhat.com>
> Sent: Monday, December 17, 2018 5:54 PM
> To: Ni, Ruiyu <ruiyu.ni@intel.com>; Justen, Jordan L
> <jordan.l.justen@intel.com>; Ard Biesheuvel <ard.biesheuvel@linaro.org>;
> Anthony Perard <anthony.perard@citrix.com>; Julien Grall
> <julien.grall@linaro.org>
> Cc: edk2-devel@lists.01.org; Kevin O'Connor <kevin@koconnor.net>; Gerd
> Hoffmann <kraxel@redhat.com>; David Woodhouse
> <dwmw2@infradead.org>
> Subject: Re: Drop CSM support in OvmfPkg?
>
> (Adding Kevin, Gerd, David)
>
> On 12/17/18 03:23, Ni, Ruiyu wrote:
> > Hi OvmfPkg maintainers and reviewers,
> > I am working on removing IntelFrameworkModulePkg and
> IntelFrameworkPkg. The biggest dependency now I see is the CSM
> components that OVMF depends on.
> > So I'd like to know your opinion about how to handle this. I see two options
> here:
> >
> > 1. Drop CSM support in OvmfPkg.
> > 2. Create a OvmfPkg/Csm folder to duplicate all CSM components there.
> >
> > What's your opinion about this?
>
> (1) Personally I never use CSM builds of OVMF. The OVMF builds in RHEL and
> Fedora also don't enable the CSM (mainly because I had found debugging &
> supporting the CSM *extremely* difficult). For virtualization, we generally
> recommend "use SeaBIOS directly if you need a traditional BIOS guest".
Yes that was my original thought.
>
> (2) I'd be definitely unhappy about having to maintain the platform-
> independent CSM components under OvmfPkg (such as
> LegacyBootManagerLib, LegacyBootMaintUiLib, LegacyBiosDxe, VideoDxe).
You are very correct about the scope of CSM components.
>
> (3) However, David and Kevin had put a *lot* of work into enabling SeaBIOS
> to function as a CSM in combination with OVMF. Today, the CSM target is a
> dedicated / separate "build mode" of SeaBIOS.
I will wait for David and Kevin's comments.
>
> (4) I also think an open source CSM implementation should exist, just so
> people can study it and experiment with it. The CSM specification (from
> Intel) is a public document, and the edk2 code is the reference
> implementation for it. Killing the reference implementation makes the spec
> mostly useless. Are Intel withdrawing the spec too? (Or has that happened
> already?)
CSM implementation follows the CSM specification. I am not sure if there is
a public spec, an accordingly implementation should exist.
For example, there is a framework HII spec which defines
EFI_FORM_BROWSER_PROTOCOL. But there is no implementation of such
protocol now in edk2 repo, only implementation of
EFI_FORM_BROWSER2_PROTOCOL.
>
> In short, I think the community would benefit if someone continued to
> maintain the CSM infrastructure in edk2, but personally I won't volunteer. I
> also understand if Intel has no more resources for it.
> Removing CSM from edk2 altogether (including OVMF) might be the natural
> (albeit regrettable) result.
I just see not much benefit of maintaining CSM in edk2 since now major OSVs
don't support CSM boot anymore. Correct me if I am wrong.
>
> Thanks
> Laszlo
next prev parent reply other threads:[~2018-12-17 10:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-17 2:23 Drop CSM support in OvmfPkg? Ni, Ruiyu
2018-12-17 9:54 ` Laszlo Ersek
2018-12-17 10:44 ` Ni, Ruiyu [this message]
2018-12-20 6:44 ` Gerd Hoffmann
2018-12-20 13:37 ` David Woodhouse
2018-12-20 14:55 ` Ni, Ruiyu
2019-01-22 16:13 ` Ni, Ray
2019-01-22 16:23 ` David Woodhouse
2019-01-23 3:43 ` Ni, Ray
2019-01-23 4:00 ` Andrew Fish
2019-01-23 4:29 ` Ni, Ray
2019-01-23 9:46 ` Laszlo Ersek
2019-01-23 9:49 ` David Woodhouse
2019-01-24 1:48 ` Ni, Ray
2019-01-24 9:31 ` David Woodhouse
2019-01-24 11:30 ` Laszlo Ersek
2019-01-25 20:28 ` Brian J. Johnson
2019-01-28 8:23 ` Laszlo Ersek
2019-01-23 12:26 ` Ard Biesheuvel
2019-01-23 6:12 ` Gerd Hoffmann
2019-01-23 8:42 ` David Woodhouse
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