On Wed, Oct 11, 2017 at 12:13 PM, Suneel Garapati suneelglinux@gmail.com wrote:

Hi Rob,

I am enlisted on u-boot mailing list and currently trying to use efi loader to launch ubuntu distro.

Appreciate your great efforts on this, would definitely help a lot.

I tried to boot grub from u-boot using efi_loader using, bootefi <grub-loaded-addr> <fdt addr>

note that the distro-bootcmd stuff should "just work" to avoid needing to do this step manually

however I see one error "Error to install/update FDT" while launch ubuntu from grub menu.

So, without editing grub.cfg to add 'devicetree' commands, it is expecting u-boot to load the correct fdt before 'bootefi'.. I have a patch[1] to do this as part of distro-bootcmd which we are using in fedora.

[1] https://patchwork.ozlabs.org/patch/821470/

I could also see "Loading Linux.." "Loading ramdisk..." But jumps back to grub menu instead of booting into linux.

I would like to know if CONFIG_EFI_LOADER will suffice or anything else needs to be defined for distro support.

I think also CONFIG_DISTRO_DEFAULTS.. assuming there are no special hacks in ubuntu's grub build for arm/arm64, at least. For fedora we are not using any special arm specific patches for grub (or shim/fallback) and (at least with the addition of the patch mentioned above to handled fdt loading in u-boot) it all just works automatically the same way it does on x86_64 (with all the other patches that landed for 2017.11 so far).

BR, -R

Any suggestions/inputs would be of great help.

Regards, Suneel