milkv/pioneer: init

milkv/pioneer/linux.nix

@@ -0,0 +1,44 @@
+{ buildLinux, fetchFromGitHub, kernelPatches, lib, ... } @ args:
+
+let
+  modDirVersion = "6.6.20";
+in
+buildLinux (args // {
+  inherit kernelPatches modDirVersion;
+  version = "${modDirVersion}-milkv-pioneer";
+  src = fetchFromGitHub {
+    owner = "sophgo";
+    repo = "linux-riscv";
+    rev = "caa949e3690fe8a4656313b2b56f52666fa880db";
+    hash = "sha256-qJpR3KMgvP4tfPfBfQ/MiEWg/uuuxHYuACK8taKKK3E=";
+  };
+
+  defconfig = "sophgo_mango_normal_defconfig";
+  structuredExtraConfig = let inherit (lib.kernel) freeform module yes; in {
+    # LinuxBoot will override the console bootparams which will result
+    # in the distro kernel to be booted with e.g. console=tty1 only.
+    # https://github.com/sophgo/bootloader-riscv/issues/71
+    # Force output on serial console through the config. This is also
+    # needed to get the forced serial-getty to be started.
+    # We also list tty1 again because according to
+    # https://docs.kernel.org/admin-guide/serial-console.html and
+    # https://0pointer.de/blog/projects/serial-console.html
+    # this will be the main console.
+    CMDLINE = freeform "console=ttyS0,115200 console=tty1";
+    CMDLINE_EXTEND = yes;
+
+    # Enable these explicitly because they are not enabled by the defconfig.
+    # The all-hardware profile expects these to be built.
+    VIRTIO_MENU = yes;
+    VIRTIO_PCI = module;
+
+    # There is an i2c mcu driver (drivers/soc/sophgo/umcu) which is always
+    # compiled into the kernel. Hence some of the i2c support also needs to
+    # be compiled in instead of being compiled as a module.
+    I2C = yes;
+    I2C_CHARDEV = yes;
+    I2C_DESIGNWARE_PLATFORM = yes;
+  };
+
+  extraMeta.branch = "sg2042-dev-6.6";
+} // (args.argsOverride or { }))