New, simpler, infrastructure for building the Linux kernel

This patch introduces a single, simple, infrastructure to build the
Linux kernel. The configuration is limited to :

 * Kernel version: a fixed recent stable version, same as kernel
   headers version (for internal toolchains only), custom stable
   version, or custom tarball URL

 * Kernel patch: either a local file, directory or an URL

 * Kernel configuration: either the name of a defconfig or the
   location of a custom configuration file

 * Kernel image: either uImage, bzImage, zImage or vmlinux.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 133 insertions, 0 deletions

diff --git a/linux/Config.in b/linux/Config.in
new file mode 100644
index 000000000..d8a5157e2
--- /dev/null
+++ b/linux/Config.in
@@ -0,0 +1,133 @@
+menu "Kernel"
+
+config BR2_LINUX_KERNEL
+	bool "Linux Kernel"
+	help
+	  Enable this option if you want to build a Linux kernel for
+	  your embedded device
+
+if BR2_LINUX_KERNEL
+
+#
+# Version selection. We provide the choice between:
+#
+#  1. A single fairly recent stable kernel version
+#  2. In case an internal toolchain has been built, the same kernel
+#     version as the kernel headers
+#  3. A custom stable version
+#  4. A custom tarball
+#
+choice
+	prompt "Kernel version"
+	default BR2_LINUX_KERNEL_2_6_34
+
+config BR2_LINUX_KERNEL_2_6_34
+	bool "2.6.34"
+
+config BR2_LINUX_KERNEL_SAME_AS_HEADERS
+	bool "Same as toolchain kernel headers"
+	depends on BR2_TOOLCHAIN_BUILDROOT
+	help
+	  This option will re-use the same kernel sources as the one
+	  that have been used for the kernel headers of the
+	  cross-compiling toolchain. Having the same version for the
+	  kernel running on the system and for the kernel headers is
+	  not a requirement, but using the same version allows to
+	  download only one tarball of the kernel sources.
+
+config BR2_LINUX_KERNEL_CUSTOM_VERSION
+	bool "Custom version"
+	help
+	  This option allows to use a specific 2.6.x or 2.6.x.y
+	  official versions, as available on kernel.org
+
+config BR2_LINUX_KERNEL_CUSTOM_TARBALL
+	bool "Custom tarball"
+	help
+	  This option allows to specify the http or ftp location of a
+	  specific kernel source tarball
+
+endchoice
+
+config BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE
+	string "Kernel version"
+	depends on BR2_LINUX_KERNEL_CUSTOM_VERSION
+	default "2.6.34"
+
+config BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION
+	string "URL of custom kernel tarball"
+	depends on BR2_LINUX_KERNEL_CUSTOM_TARBALL
+
+config BR2_LINUX_KERNEL_VERSION
+	string
+	default "2.6.34" if BR2_LINUX_KERNEL_2_6_34
+	default BR2_DEFAULT_KERNEL_HEADERS if BR2_LINUX_KERNEL_SAME_AS_HEADERS
+	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE if BR2_LINUX_KERNEL_CUSTOM_VERSION
+	default "custom" if BR2_LINUX_KERNEL_CUSTOM_TARBALL
+
+#
+# Patch selection
+#
+
+config BR2_LINUX_KERNEL_PATCH
+	string "Custom kernel patch"
+	help
+         The location can be an URL, a file path, or a directory. In
+         the case of a directory, all files matching linux-*.patch
+         will be applied.
+
+#
+# Configuration selection
+#
+
+choice
+	prompt "Kernel configuration"
+	default BR2_LINUX_KERNEL_USE_DEFCONFIG
+
+config BR2_LINUX_KERNEL_USE_DEFCONFIG
+	bool "Using a defconfig"
+
+config BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
+	bool "Using a custom config file"
+
+endchoice
+
+config BR2_LINUX_KERNEL_DEFCONFIG
+	string "Defconfig name"
+	depends on BR2_LINUX_KERNEL_USE_DEFCONFIG
+	help
+	 Name of the defconfig file to use, without the leading
+	 _defconfig
+
+config BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE
+	string "Configuration file path"
+	depends on BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
+	help
+	  Path to the kernel configuration file
+
+#
+# Binary format
+#
+
+choice
+	prompt "Kernel binary format"
+	default BR2_LINUX_KERNEL_UIMAGE if !BR2_i386 && !BR2_x86_64
+	default BR2_LINUX_KERNEL_BZIMAGE if BR2_i386 || BR2_x86_64
+
+config BR2_LINUX_KERNEL_UIMAGE
+	bool "uImage"
+
+config BR2_LINUX_KERNEL_BZIMAGE
+	bool "bzImage"
+
+config BR2_LINUX_KERNEL_ZIMAGE
+	bool "zImage"
+
+config BR2_LINUX_KERNEL_VMLINUX
+	bool "vmlinux"
+
+endchoice
+
+endif # BR2_LINUX_KERNEL
+
+endmenu