[PATCH v4 00/29] arm: Support building as an EFI app

[Tom Rini]

On Thu, Mar 27, 2025 at 07:36:06AM -0600, Simon Glass wrote:
> Hi Tom,
> 
> On Fri, 21 Feb 2025 at 13:45, Tom Rini <trini at konsulko.com> wrote:
> >
> > On Fri, Feb 14, 2025 at 08:22:21PM -0700, Simon Glass wrote:
> >
> > > The original x86 EFI-app was written back in 2015, about a year before
> > > the EFI-loader was introduced. At that point, ARM mostly used U-Boot and
> > > FIT (Flat Image Tree).
> > >
> > > Today, sadly, there are a few efforts to re-invent FIT poorly, to cater
> > > to more primitive boot-environments than U-Boot. One justification for
> > > this re-invetion has been that EDK2 did not support FIT.
> > >
> > > EDK2 does now support FIT but only for the firmware stage. Even then,
> > > vendors tend to use their own forks, so any new features are slow to
> > > make it into the market.
> > >
> > > EDK2 also supports the ext4 filesystem, but many devices don't include
> > > that feature, so most distros make use of FAT for storing their boot
> > > files. Since FAT is not journalled, it is not particularly reliable in
> > > the face of reset, power failure, etc.
> > >
> > > As an interim measure, we can use U-Boot as an EFI app running on top of
> > > whatever EDK2 fork is in use. This allows use of modern features such as
> > > FIT and filesystems other than FAT. So far this only supports x86, but
> > > recent ARM laptops are making use of EFI too.
> > >
> > > So this series adds an EFI app for 64-bit ARM.
> > >
> > > Note: Since U-Boot does not support EFI's GOP 'blt-only' mode, the
> > > vidconsole does not operate, but it can still be used, since EDK2
> > > handles drawing instead of U-Boot. As a result, the U-Boot logo is not
> > > shown.
> >
> > You did miss some of the tags I provided against v3, fwiw.
> 
> I see this is marked as 'deferred' in patchwork. I'm going to apply it
> to my tree.
> 
> If you like, I could do a pull request against -next with the EFI-app updates.

Yes, I marked it as deferred as this was not based on next to start
with. If you would like to see progress on this, please start by
rebasing, addressing the outstanding feedback on and posting the
pre-requisite patches you applied to your own tree.

-- 
Tom
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