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U-Boot: add Pi4 variants and support in uboot-builder #87244

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@sorki
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sorki commented May 8, 2020

Motivation for this change

Pi 4 with u-boot.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

See also #63720

@sorki sorki changed the title U-boot: add Pi4 variants and support in uboot-builder U-Boot: add Pi4 variants and support in uboot-builder May 8, 2020
@prusnak
prusnak approved these changes May 8, 2020
@matthewbauer
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matthewbauer commented May 8, 2020

Last I checked uboot and pi4 didn't mix well. Has this changed recently? See:

I tried a bunch of things to get rpi4 64-bit u-boot to work, but ended up having to just use the rpi kernel loader.

@sorki
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sorki commented May 9, 2020

Thanks! Indeed it's not quite there, the dtb is missing from u-boot but already available in linux-5.6 but I can't even get serial output even with u-boot fork

    src = fetchFromGitHub {
      owner = "agherzan";
      repo = "u-boot";
      rev = "ag/rpi4";
      sha256 = "1cy58h9ljqw7yhv18n11c13pp70r98ldjbnsafmapc9mfn3gzhpa";
    };  

Also tried adding armstub8-gic.bin and copied bcm2711-rpi-4-b.dtb to first partition as suggested in @samueldr s PR which I've totally missed as it was hiding in 23 hidden items of the pi support issue :(.

I'll close this for now and possibly reopen when mainline u-boot is ready - I've discovered one more cross issue during this and created #87344

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