u-boot: ROCK64 RAM init improvements

This switches the ROCK64 over to the open-source RAM init as it now
works flawlessly. It also removes the HDCP flag from the ATF for the
RK3328 as it cannot use it, it is only used in the RK3399. This makes
the ROCK64 u-boot now fully open.

There is also an issue with the ROCK64 v2 revision where the DRAM
routing is marginal, making some of them unstable. So also package a
variant which uses a lower-speed DDR3 timing configuration which is
stable on these boards.

pkgs/misc/arm-trusted-firmware/default.nix

@@ -141,7 +141,6 @@ in {
     platform = "rk3328";
     extraMeta.platforms = ["aarch64-linux"];
     filesToInstall = [ "build/${platform}/release/bl31/bl31.elf"];
-    platformCanUseHDCPBlob = true;
   };
 
   armTrustedFirmwareRK3399 = buildArmTrustedFirmware rec {

pkgs/misc/uboot/default.nix

@@ -497,32 +497,28 @@ in {
     filesToInstall = ["u-boot.bin"];
   };
 
-  ubootRock64 = let
-    rkbin = fetchFromGitHub {
-      owner = "ayufan-rock64";
-      repo = "rkbin";
-      rev = "f79a708978232a2b6b06c2e4173c5314559e0d3a";
-      sha256 = "0h7xm4ck3p3380c6bqm5ixrkxwcx6z5vysqdwvfa7gcqx5d6x5zz";
-    };
-  in buildUBoot {
+  ubootRock64 = buildUBoot {
     defconfig = "rock64-rk3328_defconfig";
-    extraMeta = {
-      platforms = [ "aarch64-linux" ];
-      license = lib.licenses.unfreeRedistributableFirmware;
-    };
+    extraMeta.platforms = [ "aarch64-linux" ];
     BL31="${armTrustedFirmwareRK3328}/bl31.elf";
-    filesToInstall = [ "u-boot.itb" "idbloader.img"];
-    # Derive MAC address from cpuid
-    # Submitted upstream: https://patchwork.ozlabs.org/patch/1203686/
-    extraConfig = ''
-      CONFIG_MISC_INIT_R=y
-    '';
-    # Close to being blob free, but the U-Boot TPL causes random memory
-    # corruption
-    postBuild = ''
-      ./tools/mkimage -n rk3328 -T rksd -d ${rkbin}/rk33/rk3328_ddr_786MHz_v1.13.bin idbloader.img
-      cat spl/u-boot-spl.bin >> idbloader.img
+    filesToInstall = [ "u-boot.itb" "idbloader.img" "u-boot-rockchip.bin" ];
+  };
+
+  # A special build with much lower memory frequency (666 vs 1600 MT/s) which
+  # makes ROCK64 V2 boards stable. This is necessary because the DDR3 routing
+  # on that revision is marginal and not uncoditionally stable at the specified
+  # frequency. If your ROCK64 is unstable you can try this u-boot variant to
+  # see if it works better for you. The only disadvantage is lowered memory
+  # bandwidth.
+  ubootRock64v2 = buildUBoot {
+    prePatch = ''
+      substituteInPlace arch/arm/dts/rk3328-rock64-u-boot.dtsi \
+        --replace rk3328-sdram-lpddr3-1600.dtsi rk3328-sdram-lpddr3-666.dtsi
     '';
+    defconfig = "rock64-rk3328_defconfig";
+    extraMeta.platforms = [ "aarch64-linux" ];
+    BL31="${armTrustedFirmwareRK3328}/bl31.elf";
+    filesToInstall = [ "u-boot.itb" "idbloader.img" "u-boot-rockchip.bin" ];
   };
 
   ubootRockPro64 = buildUBoot {

pkgs/top-level/all-packages.nix

@@ -28876,6 +28876,7 @@ with pkgs;
     ubootRaspberryPi4_64bit
     ubootRaspberryPiZero
     ubootRock64
+    ubootRock64v2
     ubootRockPi4
     ubootRockPro64
     ubootROCPCRK3399