khadas-edge2: add vendor uboot to images

[efectn]

Description

Khadas Edge 2 images has been shipped without Uboot and it may cause some problems like not-booting when eMMC and SPI is empty. This PR adds vendor's uboot to Edge 2 images.
I've also added BL32 blob because the board doesn't boot when SPI has BL32 blobs and SD card doesn't have.

cc @rpardini @viraniac

How Has This Been Tested?

• SPI + SD card
• Empty SPI + SD card
• SPI + eMMC
• Empty SPI + eMMC

Checklist:

Please delete options that are not relevant.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[ColorfulRhino]

You can also try adding mainline U-Boot 2024.07 which works very well with the generic rk3588 defconfig, no specialization for the baord needed :)

[ColorfulRhino]

I've also added BL32 blob because the board doesn't boot when SPI has BL32 blobs and SD card doesn't have.

Does BL32/optee have any other advantages in your opinion? I am about to reseach more about optee, what it does exactly, including its advantages, and if there's a way to build it from source and include it in mainline U-Boot.

[efectn]

I've also added BL32 blob because the board doesn't boot when SPI has BL32 blobs and SD card doesn't have.

Does BL32/optee have any other advantages in your opinion? I am about to reseach more about optee, what it does exactly, including its advantages, and if there's a way to build it from source and include it in mainline U-Boot.

I don't have an idea, as well. I've never used it any TEE client before

[efectn]

You can also try adding mainline U-Boot 2024.07 which works very well with the generic rk3588 defconfig, no specialization for the baord needed :)

Maybe it's better to do it in another PR since Khadas uboot has some additions on board and cmds like kbi.

[efectn]

I've just tested 4 cases and all works well. I think the PR is now ready to merge

[ColorfulRhino]

This PR has a merge conflict.
I tried to solve it by checking out this PR, using git merge main, resolving the conflict, but then git push does not work (also git push armbian HEAD:refs/pull/6741/head does not work).

Usually I use rebase instead of merge, I wanted to try merge this time. But since it doesn't work, I'm not going to try harder, I don't want to accidentally destroy this PR 😅
Let me know how you solved it in the end :)

[igorpecovnik]

I couldn't force commit to yours. Replace PR with those commits:
main...edge2-add-uboot

[efectn]

I couldn't force commit to yours. Replace PR with those commits: main...edge2-add-uboot

I'm not at the home ATM and won't be for a while can you create a new PR instead