kernel: add beagleboard.org kernel

And update the existing platform variant to use it

lib/systems/platforms.nix

@@ -462,7 +462,7 @@ rec {
 
   beaglebone = armv7l-hf-multiplatform // {
     name = "beaglebone";
-    kernelBaseConfig = "omap2plus_defconfig";
+    kernelBaseConfig = "bb.org_defconfig";
     kernelAutoModules = false;
     kernelExtraConfig = ""; # TBD kernel config
     kernelTarget = "zImage";

pkgs/os-specific/linux/kernel/linux-beagleboard.nix

@@ -0,0 +1,25 @@
+{ stdenv, hostPlatform, fetchFromGitHub, perl, buildLinux, ... } @ args:
+
+let
+  modDirVersion = "4.9.59";
+  tag = "r73";
+in
+import ./generic.nix (args // rec {
+  version = "${modDirVersion}-ti-${tag}";
+  inherit modDirVersion;
+
+  src = fetchFromGitHub {
+    owner = "beagleboard";
+    repo = "linux";
+    rev = "${version}";
+    sha256 = "1kzbbaqmzgvfls1v9jir2ck9vcdd774mq474vhr5x6dqjnnb5kg9";
+  };
+
+  kernelPatches = args.kernelPatches;
+
+  features = {
+    efiBootStub = false;
+  } // (args.features or {});
+
+  extraMeta.hydraPlatforms = [];
+} // (args.argsOverride or {}))

pkgs/top-level/all-packages.nix

@@ -12414,6 +12414,15 @@ with pkgs;
 
   klibcShrunk = lowPrio (callPackage ../os-specific/linux/klibc/shrunk.nix { });
 
+  linux_beagleboard = callPackage ../os-specific/linux/kernel/linux-beagleboard.nix {
+    kernelPatches =
+      [ kernelPatches.bridge_stp_helper
+        kernelPatches.p9_fixes
+        kernelPatches.cpu-cgroup-v2."4.9"
+        kernelPatches.modinst_arg_list_too_long
+      ];
+  };
+
   linux_hardened_copperhead = callPackage ../os-specific/linux/kernel/linux-hardened-copperhead.nix {
     kernelPatches = with kernelPatches; [
       kernelPatches.bridge_stp_helper
@@ -12682,6 +12691,7 @@ with pkgs;
   linux_latest = linuxPackages_latest.kernel;
 
   # Build the kernel modules for the some of the kernels.
+  linuxPackages_beagleboard = linuxPackagesFor pkgs.linux_beagleboard;
   linuxPackages_hardened_copperhead = linuxPackagesFor pkgs.linux_hardened_copperhead;
   linuxPackages_mptcp = linuxPackagesFor pkgs.linux_mptcp;
   linuxPackages_rpi = linuxPackagesFor pkgs.linux_rpi;