[PATCH 1/1] configs: visionfive2: enable CONFIG_DISTRO_DEFAULTS

[E Shattow]

On Mon, Nov 25, 2024 at 2:51 AM Loic Devulder <ldevulder at suse.com> wrote:
>
> Hi!
>
> Oh sorry I didn't know that it was already here before... Thanks, I will try the patches then.
>
> Just one question: does this means that we will not be able to "easily" load a different DTB like we
> can with distri_defaults? I know that we can always does this with u-boot command line as well as
> with Grub but it's not so easy. But maybe it's handled by OF_UPSTREAM, but I have first to read all
> the patch series ;-).
>
> Loic
>

See "Device-tree selection" in documentation at:
https://docs.u-boot.org/en/latest/board/starfive/visionfive2.html

Additional information to understand is that EFI bootmgr can prefer
the EFI configuration variable (file `ubootefi.var` on EFI System
Partition) to select FDT. There is not much control by the user of
which ESP is selected for U-Boot to operate its EFI environment, so
the environment may change at boot if there are more than one ESP
present.

When combined Unified Kernel Image (UKI) with support for wget in EFI
then there is not any need to prepare a separate TFTP server or media
for network-based installation. I have tested some version of Debian
Installer as UKI and it is easy, not depending on hybrid ISO9660
complexity. I think this may be how all OS distribution installer can
become less complicated.

When you need to make improvements to the DTS then you will submit a
patch to Linux Kernel Mailing List and when merged upstream then
U-Boot will sync to the Linux Kernel Devicetree-Rebasing git
repository.

If you need DTBO (overlay support) then that is some other topic.

-E