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buildroot/linux/linux.mk
Oleg Lyovin 0b9efc991f linux: use BR2_MAKE 
Since kernel version 6.2, the minimum GNU Make version is 3.82 [1]. We
have an optional host-make 4.0 minimum dependency, so we can use it as
is. It's a bit unfortunate that we have to apply this even to older
kernel versions, but make itself builds fairly fast compared to the
kernel.

Use BR2_MAKE and BR2_MAKE1 for linux, and depend on
BR2_MAKE_HOST_DEPENDENCY. In addition, we need to set LINUX_MAKE to
BR2_MAKE for use in the kconfig infrastructure.

Signed-off-by: Oleg Lyovin <ovlevin@sberdevices.ru>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
2023-04-10 17:24:15 +02:00

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################################################################################
#
# Linux kernel target
#
################################################################################
LINUX_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
LINUX_LICENSE = GPL-2.0
ifeq ($(BR2_LINUX_KERNEL_LATEST_VERSION),y)
LINUX_LICENSE_FILES = \
COPYING \
LICENSES/preferred/GPL-2.0 \
LICENSES/exceptions/Linux-syscall-note
endif
LINUX_CPE_ID_VENDOR = linux
LINUX_CPE_ID_PRODUCT = linux_kernel
LINUX_CPE_ID_PREFIX = cpe:2.3:o
# Compute LINUX_SOURCE and LINUX_SITE from the configuration
ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
LINUX_SITE_METHOD = git
else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
LINUX_SITE_METHOD = hg
else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
LINUX_SITE_METHOD = svn
else ifeq ($(BR2_LINUX_KERNEL_LATEST_CIP_VERSION)$(BR2_LINUX_KERNEL_LATEST_CIP_RT_VERSION),y)
LINUX_SOURCE = linux-cip-$(LINUX_VERSION).tar.gz
LINUX_SITE = https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/snapshot
else ifneq ($(findstring -rc,$(LINUX_VERSION)),)
# Since 4.12-rc1, -rc kernels are generated from cgit. This also works for
# older -rc kernels.
LINUX_SITE = https://git.kernel.org/torvalds/t
else
LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
else
LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v$(firstword $(subst ., ,$(LINUX_VERSION))).x
endif
endif
ifeq ($(BR2_LINUX_KERNEL)$(BR2_LINUX_KERNEL_LATEST_VERSION),y)
BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
endif
LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
# We have no way to know the hashes for user-supplied patches.
BR_NO_CHECK_HASH_FOR += $(notdir $(LINUX_PATCHES))
# We rely on the generic package infrastructure to download and apply
# remote patches (downloaded from ftp, http or https). For local
# patches, we can't rely on that infrastructure, because there might
# be directories in the patch list (unlike for other packages).
LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
# while the kernel is built for the target, the build may need various
# host libraries depending on config (and version), so use
# HOST_MAKE_ENV here. In particular, this ensures that our
# host-pkgconf will look for host libraries and not target ones.
LINUX_MAKE_ENV = \
$(HOST_MAKE_ENV) \
BR_BINARIES_DIR=$(BINARIES_DIR)
LINUX_INSTALL_IMAGES = YES
LINUX_DEPENDENCIES = \
host-kmod \
$(BR2_MAKE_HOST_DEPENDENCY)
LINUX_MAKE = $(BR2_MAKE)
# The kernel CONFIG_EXTRA_FIRMWARE feature requires firmware files at build
# time. Make sure they are available before the kernel builds.
LINUX_DEPENDENCIES += \
$(if $(BR2_PACKAGE_INTEL_MICROCODE),intel-microcode) \
$(if $(BR2_PACKAGE_LINUX_FIRMWARE),linux-firmware) \
$(if $(BR2_PACKAGE_FIRMWARE_IMX),firmware-imx) \
$(if $(BR2_PACKAGE_WIRELESS_REGDB),wireless-regdb)
# Starting with 4.16, the generated kconfig paser code is no longer
# shipped with the kernel sources, so we need flex and bison, but
# only if the host does not have them.
LINUX_KCONFIG_DEPENDENCIES = \
$(BR2_BISON_HOST_DEPENDENCY) \
$(BR2_FLEX_HOST_DEPENDENCY)
# Starting with 4.18, the kconfig in the kernel calls the
# cross-compiler to check its capabilities. So we need the
# toolchain before we can call the configurators.
LINUX_KCONFIG_DEPENDENCIES += toolchain
# host tools needed for kernel compression
ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
LINUX_DEPENDENCIES += host-lz4
else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
LINUX_DEPENDENCIES += host-lzma
else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
LINUX_DEPENDENCIES += host-lzop
else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
LINUX_DEPENDENCIES += host-xz
else ifeq ($(BR2_LINUX_KERNEL_ZSTD),y)
LINUX_DEPENDENCIES += host-zstd
endif
LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) += CONFIG_KERNEL_GZIP
LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) += CONFIG_KERNEL_LZ4
LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) += CONFIG_KERNEL_LZMA
LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) += CONFIG_KERNEL_LZO
LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) += CONFIG_KERNEL_XZ
LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_ZSTD) += CONFIG_KERNEL_ZSTD
LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_UNCOMPRESSED) += CONFIG_KERNEL_UNCOMPRESSED
ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL),y)
LINUX_DEPENDENCIES += host-openssl
endif
ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF),y)
LINUX_DEPENDENCIES += host-elfutils host-pkgconf
endif
ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_PAHOLE),y)
LINUX_DEPENDENCIES += host-pahole
else
define LINUX_FIXUP_CONFIG_PAHOLE_CHECK
if grep -q "^CONFIG_DEBUG_INFO_BTF=y" $(KCONFIG_DOT_CONFIG); then \
echo "To use CONFIG_DEBUG_INFO_BTF, enable host-pahole (BR2_LINUX_KERNEL_NEEDS_HOST_PAHOLE)" 1>&2; \
exit 1; \
fi
endef
endif
# If host-uboot-tools is selected by the user, assume it is needed to
# create a custom image
ifeq ($(BR2_PACKAGE_HOST_UBOOT_TOOLS),y)
LINUX_DEPENDENCIES += host-uboot-tools
endif
ifneq ($(ARCH_XTENSA_OVERLAY_FILE),)
define LINUX_XTENSA_OVERLAY_EXTRACT
$(call arch-xtensa-overlay-extract,$(@D),linux)
endef
LINUX_POST_EXTRACT_HOOKS += LINUX_XTENSA_OVERLAY_EXTRACT
LINUX_EXTRA_DOWNLOADS += $(ARCH_XTENSA_OVERLAY_URL)
endif
# We don't want to run depmod after installing the kernel. It's done in a
# target-finalize hook, to encompass modules installed by packages.
# Disable building host tools with -Werror: newer gcc versions can be
# extra picky about some code (https://bugs.busybox.net/show_bug.cgi?id=14826)
LINUX_MAKE_FLAGS = \
HOSTCC="$(HOSTCC) $(subst -I/,-isystem /,$(subst -I /,-isystem /,$(HOST_CFLAGS))) $(HOST_LDFLAGS)" \
ARCH=$(KERNEL_ARCH) \
INSTALL_MOD_PATH=$(TARGET_DIR) \
CROSS_COMPILE="$(TARGET_CROSS)" \
WERROR=0 \
REGENERATE_PARSERS=1 \
DEPMOD=$(HOST_DIR)/sbin/depmod
ifeq ($(BR2_REPRODUCIBLE),y)
LINUX_MAKE_ENV += \
KBUILD_BUILD_VERSION=1 \
KBUILD_BUILD_USER=buildroot \
KBUILD_BUILD_HOST=buildroot \
KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C TZ='UTC' date -d @$(SOURCE_DATE_EPOCH))"
endif
# gcc-8 started warning about function aliases that have a
# non-matching prototype. This seems rather useful in general, but it
# causes tons of warnings in the Linux kernel, where we rely on
# abusing those aliases for system call entry points, in order to
# sanitize the arguments passed from user space in registers.
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82435
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
LINUX_MAKE_ENV += KCFLAGS=-Wno-attribute-alias
endif
ifeq ($(BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT),y)
LINUX_MAKE_ENV += DTC_FLAGS=-@
endif
# Get the real Linux version, which tells us where kernel modules are
# going to be installed in the target filesystem.
# Filter out 'w' from MAKEFLAGS, to workaround a bug in make 4.1 (#13141)
LINUX_VERSION_PROBED = `MAKEFLAGS='$(filter-out w,$(MAKEFLAGS))' $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
LINUX_DTS_NAME += $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
# We keep only the .dts files, so that the user can specify both .dts
# and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
# copied to arch/<arch>/boot/dts, but only the .dts files will
# actually be generated as .dtb.
LINUX_DTS_NAME += $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
LINUX_DTBS = $(addsuffix .dtb,$(LINUX_DTS_NAME))
ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
ifeq ($(LINUX_IMAGE_NAME),)
LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
endif
else
ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
LINUX_IMAGE_NAME = uImage
else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
LINUX_IMAGE_NAME = uImage
else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
LINUX_IMAGE_NAME = bzImage
else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
LINUX_IMAGE_NAME = zImage
else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
LINUX_IMAGE_NAME = zImage.epapr
else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
LINUX_IMAGE_NAME = zImage
else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
LINUX_IMAGE_NAME = cuImage.$(firstword $(LINUX_DTS_NAME))
else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
LINUX_IMAGE_NAME = simpleImage.$(firstword $(LINUX_DTS_NAME))
else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
LINUX_IMAGE_NAME = Image
else ifeq ($(BR2_LINUX_KERNEL_IMAGEGZ),y)
LINUX_IMAGE_NAME = Image.gz
else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
LINUX_IMAGE_NAME = linux.bin
else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
LINUX_IMAGE_NAME = vmlinux.bin
else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
LINUX_IMAGE_NAME = vmlinux
else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
LINUX_IMAGE_NAME = vmlinuz
else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
LINUX_IMAGE_NAME = vmlinuz.bin
endif
# The if-else blocks above are all the image types we know of, and all
# come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
# to something
LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
endif
LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
endif
# Compute the arch path, since i386 and x86_64 are in arch/x86 and not
# in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
# for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
# defconfig file.
ifeq ($(KERNEL_ARCH),i386)
LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
else ifeq ($(KERNEL_ARCH),x86_64)
LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
else ifeq ($(KERNEL_ARCH),sparc64)
LINUX_ARCH_PATH = $(LINUX_DIR)/arch/sparc
else
LINUX_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
endif
ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
else
LINUX_IMAGE_PATH = $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
endif # BR2_LINUX_KERNEL_VMLINUX
define LINUX_APPLY_LOCAL_PATCHES
for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
if test -d $$p ; then \
$(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
else \
$(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
fi \
done
endef
LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
# Older versions break on gcc 10+ because of redefined symbols
define LINUX_DROP_YYLLOC
$(Q)grep -Z -l -r -E '^YYLTYPE yylloc;$$' $(@D) \
|xargs -0 -r $(SED) '/^YYLTYPE yylloc;$$/d'
endef
LINUX_POST_PATCH_HOOKS += LINUX_DROP_YYLLOC
# Kernel version < 5.6 breaks if host-gcc version is >= 10 and
# 'yylloc' symbol is removed in previous hook, due to missing
# '%locations' bison directive in dtc-parser.y. See:
# https://bugs.busybox.net/show_bug.cgi?id=14971
define LINUX_ADD_DTC_LOCATIONS
$(Q)DTC_PARSER=$(@D)/scripts/dtc/dtc-parser.y; \
if test -e "$${DTC_PARSER}" \
&& ! grep -Eq '^%locations$$' "$${DTC_PARSER}" ; then \
$(SED) '/^%{$$/i %locations' "$${DTC_PARSER}"; \
fi
endef
LINUX_POST_PATCH_HOOKS += LINUX_ADD_DTC_LOCATIONS
# Older linux kernels use deprecated perl constructs in timeconst.pl
# that were removed for perl 5.22+ so it breaks on newer distributions
# Try a dry-run patch to see if this applies, if it does go ahead
define LINUX_TRY_PATCH_TIMECONST
@if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
$(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
fi
endef
LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
LINUX_KERNEL_CUSTOM_LOGO_PATH = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOGO_PATH))
ifneq ($(LINUX_KERNEL_CUSTOM_LOGO_PATH),)
LINUX_DEPENDENCIES += host-imagemagick
define LINUX_KERNEL_CUSTOM_LOGO_CONVERT
$(HOST_DIR)/bin/convert $(LINUX_KERNEL_CUSTOM_LOGO_PATH) \
-dither None -colors 224 -compress none \
$(LINUX_DIR)/drivers/video/logo/logo_linux_clut224.ppm
endef
LINUX_PRE_BUILD_HOOKS += LINUX_KERNEL_CUSTOM_LOGO_CONVERT
endif
ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
ifeq ($(BR2_powerpc64le),y)
LINUX_KCONFIG_DEFCONFIG = ppc64le_defconfig
else
LINUX_KCONFIG_DEFCONFIG = defconfig
endif
else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
endif
LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
# LINUX_MAKE_FLAGS overrides HOSTCC to allow the kernel build to find
# our host-openssl and host-libelf. However, this triggers a bug in
# the kconfig build script that causes it to build with
# /usr/include/ncurses.h (which is typically wchar) but link with
# $(HOST_DIR)/lib/libncurses.so (which is not). We don't actually
# need any host-package for kconfig, so remove the HOSTCC override
# again. In addition, even though linux depends on the toolchain and
# therefore host-ccache would be ready, we use HOSTCC_NOCCACHE for
# consistency with other kconfig packages.
LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS) HOSTCC="$(HOSTCC_NOCCACHE)"
# If no package has yet set it, set it from the Kconfig option
LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
# Make sure the Linux kernel is built with the right endianness. Not
# all architectures support
# CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
# option will be thrown away and ignored if it doesn't exist.
ifeq ($(BR2_ENDIAN),"BIG")
define LINUX_FIXUP_CONFIG_ENDIANNESS
$(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN)
endef
else
define LINUX_FIXUP_CONFIG_ENDIANNESS
$(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN)
endef
endif
define LINUX_KCONFIG_FIXUP_CMDS
$(if $(LINUX_NEEDS_MODULES),
$(call KCONFIG_ENABLE_OPT,CONFIG_MODULES))
$(call KCONFIG_ENABLE_OPT,$(strip $(LINUX_COMPRESSION_OPT_y)))
$(foreach opt, $(LINUX_COMPRESSION_OPT_),
$(call KCONFIG_DISABLE_OPT,$(opt))
)
$(LINUX_FIXUP_CONFIG_ENDIANNESS)
$(LINUX_FIXUP_CONFIG_PAHOLE_CHECK)
$(if $(BR2_arm)$(BR2_armeb),
$(call KCONFIG_ENABLE_OPT,CONFIG_AEABI))
$(if $(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le),
$(call KCONFIG_ENABLE_OPT,CONFIG_PPC_DISABLE_WERROR))
$(if $(BR2_ARC_PAGE_SIZE_4K),
$(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
$(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
$(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
$(if $(BR2_ARC_PAGE_SIZE_8K),
$(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
$(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
$(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
$(if $(BR2_ARC_PAGE_SIZE_16K),
$(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
$(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
$(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
$(if $(BR2_ARM64_PAGE_SIZE_4K),
$(call KCONFIG_ENABLE_OPT,CONFIG_ARM64_4K_PAGES)
$(call KCONFIG_DISABLE_OPT,CONFIG_ARM64_16K_PAGES)
$(call KCONFIG_DISABLE_OPT,CONFIG_ARM64_64K_PAGES))
$(if $(BR2_ARM64_PAGE_SIZE_64K),
$(call KCONFIG_DISABLE_OPT,CONFIG_ARM64_4K_PAGES)
$(call KCONFIG_DISABLE_OPT,CONFIG_ARM64_16K_PAGES)
$(call KCONFIG_ENABLE_OPT,CONFIG_ARM64_64K_PAGES))
$(if $(BR2_TARGET_ROOTFS_CPIO),
$(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD))
# As the kernel gets compiled before root filesystems are
# built, we create a fake cpio file. It'll be
# replaced later by the real cpio archive, and the kernel will be
# rebuilt using the linux-rebuild-with-initramfs target.
$(if $(BR2_TARGET_ROOTFS_INITRAMFS),
mkdir -p $(BINARIES_DIR)
touch $(BINARIES_DIR)/rootfs.cpio
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio")
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0)
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0))
$(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS)
$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT))
$(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER))
$(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
$(call KCONFIG_ENABLE_OPT,CONFIG_NET))
$(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
$(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB))
$(if $(LINUX_KERNEL_CUSTOM_LOGO_PATH),
$(call KCONFIG_ENABLE_OPT,CONFIG_FB)
$(call KCONFIG_ENABLE_OPT,CONFIG_LOGO)
$(call KCONFIG_ENABLE_OPT,CONFIG_LOGO_LINUX_CLUT224))
$(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
$(PACKAGES_LINUX_CONFIG_FIXUPS)
endef
ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
# Starting with 4.17, the generated dtc parser code is no longer
# shipped with the kernel sources, so we need flex and bison. For
# reproducibility, we use our owns rather than the host ones.
LINUX_DEPENDENCIES += host-bison host-flex
ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
define LINUX_BUILD_DTB
$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_DTBS)
endef
ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
define LINUX_INSTALL_DTB
# dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
$(foreach dtb,$(LINUX_DTBS), \
install -D \
$(or $(wildcard $(LINUX_ARCH_PATH)/boot/dts/$(dtb)),$(LINUX_ARCH_PATH)/boot/$(dtb)) \
$(1)/$(if $(BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME),$(dtb),$(notdir $(dtb)))
)
endef
endif # BR2_LINUX_KERNEL_APPENDED_DTB
endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
endif # BR2_LINUX_KERNEL_DTS_SUPPORT
ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
# dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
define LINUX_APPEND_DTB
(cd $(LINUX_ARCH_PATH)/boot; \
for dtb in $(LINUX_DTS_NAME); do \
if test -e $${dtb}.dtb ; then \
dtbpath=$${dtb}.dtb ; \
else \
dtbpath=dts/$${dtb}.dtb ; \
fi ; \
cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
done)
endef
ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
# We need to generate a new u-boot image that takes into
# account the extra-size added by the device tree at the end
# of the image. To do so, we first need to retrieve both load
# address and entry point for the kernel from the already
# generate uboot image before using mkimage -l.
LINUX_APPEND_DTB += ; \
MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
for dtb in $(LINUX_DTS_NAME); do \
$(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
-T kernel -C none $${MKIMAGE_ARGS} \
-d $(LINUX_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
done
endif
endif
# Compilation. We make sure the kernel gets rebuilt when the
# configuration has changed. We call the 'all' and
# '$(LINUX_TARGET_NAME)' targets separately because calling them in
# the same $(BR2_MAKE) invocation has shown to cause parallel build
# issues.
# The call to disable gcc-plugins is a stop-gap measure:
# http://lists.busybox.net/pipermail/buildroot/2020-May/282727.html
define LINUX_BUILD_CMDS
$(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
$(foreach dts,$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)), \
cp -f $(dts) $(LINUX_ARCH_PATH)/boot/dts/
)
$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) all
$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
$(LINUX_BUILD_DTB)
$(LINUX_APPEND_DTB)
endef
ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
# When a DTB was appended, install the potential several images with
# appended DTBs.
define LINUX_INSTALL_IMAGE
mkdir -p $(1)
cp $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
endef
else
# Otherwise, just install the unique image generated by the kernel
# build process.
define LINUX_INSTALL_IMAGE
$(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(notdir $(LINUX_IMAGE_NAME))
endef
endif
ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
$(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
$(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
endef
endif
define LINUX_INSTALL_HOST_TOOLS
# Installing dtc (device tree compiler) as host tool, if selected
if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
$(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/bin/linux-dtc ; \
$(if $(BR2_PACKAGE_HOST_DTC),,ln -sf linux-dtc $(HOST_DIR)/bin/dtc;) \
fi
endef
define LINUX_INSTALL_IMAGES_CMDS
$(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
$(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
endef
ifeq ($(BR2_STRIP_strip),y)
LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
endif
define LINUX_INSTALL_TARGET_CMDS
$(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
# Install modules and remove symbolic links pointing to build
# directories, not relevant on the target
@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
$(LINUX_MAKE_ENV) $(BR2_MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
fi
$(LINUX_INSTALL_HOST_TOOLS)
endef
# Run depmod in a target-finalize hook, to encompass modules installed by
# packages.
define LINUX_RUN_DEPMOD
if test -d $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED) \
&& grep -q "CONFIG_MODULES=y" $(LINUX_DIR)/.config; then \
$(HOST_DIR)/sbin/depmod -a -b $(TARGET_DIR) $(LINUX_VERSION_PROBED); \
fi
endef
LINUX_TARGET_FINALIZE_HOOKS += LINUX_RUN_DEPMOD
# Include all our extensions.
#
# Note: our package infrastructure uses the full-path of the last-scanned
# Makefile to determine what package we're currently defining, using the
# last directory component in the path. Additionally, the full path of
# the package directory is also stored in _PKGDIR (e.g. to find patches)
#
# As such, including other Makefiles, like below, before we call one of
# the *-package macros usually doesn't work.
#
# However, by including the in-tree extensions after the ones from the
# br2-external trees, we're back to the situation where the last Makefile
# scanned *is* included from the correct directory.
#
# NOTE: this is very fragile, and extra care must be taken to ensure that
# we always end up with an in-tree included file. That's mostly OK, because
# we do have in-tree linux-extensions.
#
include $(sort $(wildcard $(foreach ext,$(BR2_EXTERNAL_DIRS), \
$(ext)/linux/linux-ext-*.mk)))
include $(sort $(wildcard linux/linux-ext-*.mk))
LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
$(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
$(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
$(call UPPERCASE,$(ext))_PREPARE_KERNEL))
# Checks to give errors that the user can understand
# When a custom repository has been set, check for the repository version
ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
$(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
endif
ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
$(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
endif
endif
ifeq ($(BR_BUILDING),y)
ifeq ($(BR2_LINUX_KERNEL_CUSTOM_VERSION),y)
ifeq ($(LINUX_VERSION),)
$(error No custom kernel version set. Check your BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE setting)
endif
endif
ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
# We must use the user-supplied kconfig value, because
# LINUX_KCONFIG_DEFCONFIG will at least contain the
# trailing _defconfig
ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
$(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
endif
endif
ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
ifeq ($(LINUX_KCONFIG_FILE),)
$(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
endif
endif
ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT):$(strip $(LINUX_DTS_NAME)),y:)
$(error No kernel device tree source specified, check your \
BR2_LINUX_KERNEL_INTREE_DTS_NAME / BR2_LINUX_KERNEL_CUSTOM_DTS_PATH settings)
endif
endif # BR_BUILDING
$(eval $(kconfig-package))
# Support for rebuilding the kernel after the cpio archive has
# been generated.
.PHONY: linux-rebuild-with-initramfs
linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_target_installed
linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_images_installed
linux-rebuild-with-initramfs: rootfs-cpio
linux-rebuild-with-initramfs:
@$(call MESSAGE,"Rebuilding kernel with initramfs")
# Build the kernel.
$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) $(LINUX_TARGET_NAME)
$(LINUX_APPEND_DTB)
# Copy the kernel image(s) to its(their) final destination
$(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
# If there is a .ub file copy it to the final destination
test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
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