Re: [edk2-devel] [RFC PATCH 2/2] MdeModulePkg/BdsDxe: allow consoles on drivers loaded via Driver####

["Ni, Ray" <ray.ni@intel.com>]

Ard,
I still cannot understand it.

Since Driver#### are processed (process = LoadImage + StartImage) after EndOfDxe, they are not deferred.
It means the Driver#### entrypoints are called directly.
Inside the entrypoints, driverbinding protocols are installed.

After that, EfiBootManagerConnectAllDefaultConsoles () uses driver model logic to start the proper GOP driver.

Thanks,
Ray

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ard Biesheuvel
> Sent: Wednesday, December 11, 2019 6:40 PM
> To: Ni, Ray <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>; edk2-devel-groups-io <devel@edk2.groups.io>; Leif Lindholm
> <leif.lindholm@linaro.org>; Gao, Zhichao <zhichao.gao@intel.com>; Ma, Maurice <maurice.ma@intel.com>; Dong, Guo
> <guo.dong@intel.com>; You, Benjamin <benjamin.you@intel.com>
> Subject: Re: [edk2-devel] [RFC PATCH 2/2] MdeModulePkg/BdsDxe: allow consoles on drivers loaded via Driver####
> 
> On Mon, 9 Dec 2019 at 09:42, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
> >
> > On Mon, 9 Dec 2019 at 03:12, Ni, Ray <ray.ni@intel.com> wrote:
> > >
> > > > Exactly. This flow is identical to how option ROMs are processed if
> > > > they are discovered before EndOfDxe signalling completes (which is why
> > > > the Juno platform was broken without the call to
> > > > EfiBootManagerDispatchDeferredImages() in
> > > > PlatformBootManagerBeforeConsole())
> > > >
> > >
> > > Ard,
> > > I checked ArmPkg's PlatformBootManagerLib and found it doesn't
> > > call *DispatchDeferredImages() after signaling EndOfDxe.
> > >
> >
> > It does. We just added this in 0f9395d7c5cc6ae2beaa2d87008fe158d04a8069
> >
> > > The deferred image dispatch mechanism assumes the platform
> > > needs to call the *DispatchDeferredImages() after signaling EndOfDxe.
> > >
> >
> > Indeed.
> >
> > > I don't understand why the deferred image can be loaded with your patch.
> > > They are still deferred because the loading time is before EndOfDxe.
> > >
> >
> > Yes, but because PlatformBootManagerBeforeConsole () does all of this,
> > the only way to get Driver#### to work for consoles on GOP drivers, we
> > need to move it before that call.
> 
> Any further comments on this patch?
> 
>