initial buildroot for linux 5.15

fs/erofs/Config.in

@@ -0,0 +1,24 @@
+config BR2_TARGET_ROOTFS_EROFS
+	bool "erofs root filesystem"
+	select BR2_PACKAGE_HOST_EROFS_UTILS
+	help
+	  Build a EROFS root filesystem.
+
+if BR2_TARGET_ROOTFS_EROFS
+
+config BR2_TARGET_ROOTFS_EROFS_LZ4HC
+	bool "lz4hc compression"
+	help
+	  Use lz4 high-compression to compress data in the filesystem.
+
+config BR2_TARGET_ROOTFS_EROFS_PCLUSTERSIZE
+	int "pcluster size"
+	default 0
+	help
+	  Specify the maximum size of physical cluster in bytes, as a
+	  multiple of 4KiB, for the big pcluster feature in order to
+	  get much better compression ratios (thus better sequential
+	  read performance for common storage devices), which has been
+	  introduced since Linux 5.13.
+
+endif # BR2_TARGET_ROOTFS_EROFS