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+#############################################################
+#
+# Linux kernel targets
+#
+# Note: If you have any patched to apply, create the directory
+# sources/kernel-patches and put your patches in there and number
+# them in the order you wish to apply them... i.e.
+#
+# sources/kernel-patches/001-my-special-stuff.bz2
+# sources/kernel-patches/003-gcc-Os.bz2
+# sources/kernel-patches/004_no-warnings.bz2
+# sources/kernel-patches/030-lowlatency-mini.bz2
+# sources/kernel-patches/031-lowlatency-fixes-5.bz2
+# sources/kernel-patches/099-shutup.bz2
+#
+# these patched will all be applied by the patch-kernel.sh
+# script (which will also abort the build if it finds rejects)
+# -Erik
+#
+#############################################################
+ifneq ($(filter $(TARGETS),linux),)
+
+LINUX_KERNEL=$(BUILD_DIR)/buildroot-kernel
+LINUX_DIR=$(BUILD_DIR)/linux-2.4.20
+LINUX_SOURCE=linux-2.4.20.tar.bz2
+LINUX_SITE=http://ftp.us.kernel.org/pub/linux/kernel/v2.4
+LINUX_KCONFIG=$(SOURCE_DIR)/linux.config
+LINUX_VERSION=$(shell grep -s UTS_RELEASE $(LINUX_DIR)/include/linux/version.h || echo '\#define UTS_RELEASE \"2.4.20\"' | cut -f 2 -d \" )
+
+$(DL_DIR)/$(LINUX_SOURCE):
+ $(WGET) -P $(DL_DIR) $(LINUX_SITE)/$(LINUX_SOURCE)
+
+$(LINUX_DIR)/.dist: $(DL_DIR)/$(LINUX_SOURCE)
+ rm -rf $(LINUX_DIR)
+ bzcat $(DL_DIR)/$(LINUX_SOURCE) | tar -C $(BUILD_DIR) -xvf -
+ $(SOURCE_DIR)/patch-kernel.sh $(LINUX_DIR) $(SOURCE_DIR)/kernel-patches \
+ touch $(LINUX_DIR)/.dist
+
+$(LINUX_DIR)/.configured: $(LINUX_DIR)/.dist $(LINUX_KCONFIG)
+ perl -i -p -e "s,^CROSS_COMPILE.*,\
+ CROSS_COMPILE=$(STAGING_DIR)/bin/$(ARCH)-uclibc-,g;" \
+ $(LINUX_DIR)/Makefile
+ cp $(LINUX_KCONFIG) $(LINUX_DIR)/.config
+ make -C $(LINUX_DIR) oldconfig include/linux/version.h
+ touch $(LINUX_DIR)/.configured
+
+$(LINUX_DIR)/.depend_done: $(LINUX_DIR)/.configured
+ make -C $(LINUX_DIR) dep
+ touch $(LINUX_DIR)/.depend_done
+
+$(LINUX_DIR)/arch/$(ARCH)/boot/bzImage: $(LINUX_DIR)/.depend_done
+ make -C $(LINUX_DIR) bzImage
+ make -C $(LINUX_DIR) modules
+
+$(LINUX_KERNEL): $(LINUX_DIR)/arch/$(ARCH)/boot/bzImage
+ cp -fa $(LINUX_DIR)/arch/$(ARCH)/boot/bzImage $(LINUX_KERNEL)
+
+$(TARGET_DIR)/lib/modules/$(LINUX_VERSION)/modules.dep: $(LINUX_KERNEL)
+ rm -rf $(TARGET_DIR)/lib/modules
+ rm -f $(TARGET_DIR)/sbin/cardmgr
+ make -C $(LINUX_DIR) INSTALL_MOD_PATH=$(TARGET_DIR) modules_install
+ (cd $(TARGET_DIR)/lib/modules; ln -s $(LINUX_VERSION)/kernel/drivers .)
+
+$(STAGING_DIR)/include/linux/version.h: $(LINUX_DIR)/include/linux/version.h
+ mkdir -p $(STAGING_DIR)/include
+ tar -ch -C $(LINUX_DIR)/include -f - linux | tar -xf - -C $(STAGING_DIR)/include/
+ tar -ch -C $(LINUX_DIR)/include -f - asm | tar -xf - -C $(STAGING_DIR)/include/
+
+linux: $(STAGING_DIR)/include/linux/version.h $(TARGET_DIR)/lib/modules/$(LINUX_VERSION)/modules.dep
+
+# Rename this so it is cleaned by default on a make clean
+linuxclean: clean
+ rm -f $(LINUX_KERNEL)
+ -make -C $(LINUX_DIR) clean
+
+linux-dirclean:
+ rm -rf $(LINUX_DIR)
+
+#############################################################
+#
+# Setup the kernel headers, but don't compile anything for the target yet,
+# since we still need to build a cross-compiler to do that little task for
+# us... Try to work around this little chicken-and-egg problem..
+#
+#############################################################
+linux_headers: $(LINUX_DIR)/.configured
+
+endif