1 # SPDX-License-Identifier: GPL-2.0-only
3 # Copyright (C) 2006-2020 OpenWrt.org
5 ifdef CONFIG_STRIP_KERNEL_EXPORTS
6 KERNEL_MAKEOPTS_IMAGE
+= \
7 EXTRA_LDSFLAGS
="-I$(KERNEL_BUILD_DIR) -include symtab.h"
10 INITRAMFS_EXTRA_FILES ?
= $(GENERIC_PLATFORM_DIR
)/image
/initramfs-base-files.txt
13 KERNEL_MAKEOPTS
+= CC
="$(KERNEL_CC)"
16 export HOST_EXTRACFLAGS
=-I
$(STAGING_DIR_HOST
)/include
19 Kernel
/Patch
:=$(Kernel
/Patch
/Default
)
21 ifneq (,$(findstring .xz
,$(LINUX_SOURCE
)))
24 LINUX_CAT
:=$(STAGING_DIR_HOST
)/bin
/libdeflate-gzip
-dc
27 ifeq ($(strip $(CONFIG_EXTERNAL_KERNEL_TREE
)),"")
28 ifeq ($(strip $(CONFIG_KERNEL_GIT_CLONE_URI
)),"")
29 define Kernel
/Prepare
/Default
30 $(LINUX_CAT
) $(DL_DIR
)/$(LINUX_SOURCE
) |
$(TAR
) -C
$(KERNEL_BUILD_DIR
) $(TAR_OPTIONS
)
32 $(if
$(QUILT
),touch
$(LINUX_DIR
)/.quilt_used
)
35 define Kernel
/Prepare
/Default
36 $(LINUX_CAT
) $(DL_DIR
)/$(LINUX_SOURCE
) |
$(TAR
) -C
$(KERNEL_BUILD_DIR
) $(TAR_OPTIONS
)
40 define Kernel
/Prepare
/Default
41 mkdir
-p
$(KERNEL_BUILD_DIR
)
42 if
[ -d
$(LINUX_DIR
) ]; then \
45 ln
-s
$(CONFIG_EXTERNAL_KERNEL_TREE
) $(LINUX_DIR
)
46 if
[ -d
$(LINUX_DIR
)/user_headers
]; then \
47 rm -rf
$(LINUX_DIR
)/user_headers
; \
52 ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS
),y
)
53 ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE
),y
)
54 define Kernel
/SetInitramfs
/PreConfigure
55 grep
-v
-e CONFIG_BLK_DEV_INITRD
$(LINUX_DIR
)/.config.old
> $(LINUX_DIR
)/.config
56 echo
'CONFIG_BLK_DEV_INITRD=y' >> $(LINUX_DIR
)/.config
57 echo
'CONFIG_INITRAMFS_SOURCE=""' >> $(LINUX_DIR
)/.config
60 ifeq ($(strip $(CONFIG_EXTERNAL_CPIO
)),"")
61 define Kernel
/SetInitramfs
/PreConfigure
62 grep
-v
-e INITRAMFS
-e CONFIG_RD_
-e CONFIG_BLK_DEV_INITRD
$(LINUX_DIR
)/.config.old
> $(LINUX_DIR
)/.config
63 echo
'CONFIG_BLK_DEV_INITRD=y' >> $(LINUX_DIR
)/.config
64 echo
'CONFIG_INITRAMFS_SOURCE="$(strip $(TARGET_DIR) $(INITRAMFS_EXTRA_FILES))"' >> $(LINUX_DIR
)/.config
67 define Kernel
/SetInitramfs
/PreConfigure
68 grep
-v INITRAMFS
$(LINUX_DIR
)/.config.old
> $(LINUX_DIR
)/.config
69 echo
'CONFIG_INITRAMFS_SOURCE="$(call qstrip,$(CONFIG_EXTERNAL_CPIO))"' >> $(LINUX_DIR
)/.config
74 define Kernel
/SetInitramfs
75 rm -f
$(LINUX_DIR
)/.config.prev
76 mv
$(LINUX_DIR
)/.config
$(LINUX_DIR
)/.config.old
77 $(call Kernel
/SetInitramfs
/PreConfigure
)
78 ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE
),y
)
79 echo
'CONFIG_INITRAMFS_ROOT_UID=$(shell id -u)' >> $(LINUX_DIR
)/.config
80 echo
'CONFIG_INITRAMFS_ROOT_GID=$(shell id -g)' >> $(LINUX_DIR
)/.config
81 echo
"$(if $(CONFIG_TARGET_INITRAMFS_FORCE),CONFIG_INITRAMFS_FORCE=y,# CONFIG_INITRAMFS_FORCE is not set)" >> $(LINUX_DIR
)/.config
83 echo
"# CONFIG_INITRAMFS_FORCE is not set" >> $(LINUX_DIR
)/.config
85 echo
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_NONE),CONFIG_INITRAMFS_COMPRESSION_NONE=y,# CONFIG_INITRAMFS_COMPRESSION_NONE is not set)" >> $(LINUX_DIR
)/.config
86 echo
-e
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP),CONFIG_INITRAMFS_COMPRESSION_GZIP=y\nCONFIG_RD_GZIP=y,# CONFIG_INITRAMFS_COMPRESSION_GZIP is not set\n# CONFIG_RD_GZIP is not set)" >> $(LINUX_DIR
)/.config
87 echo
-e
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_BZIP2),CONFIG_INITRAMFS_COMPRESSION_BZIP2=y\nCONFIG_RD_BZIP2=y,# CONFIG_INITRAMFS_COMPRESSION_BZIP2 is not set\n# CONFIG_RD_BZIP2 is not set)" >> $(LINUX_DIR
)/.config
88 echo
-e
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZMA),CONFIG_INITRAMFS_COMPRESSION_LZMA=y\nCONFIG_RD_LZMA=y,# CONFIG_INITRAMFS_COMPRESSION_LZMA is not set\n# CONFIG_RD_LZMA is not set)" >> $(LINUX_DIR
)/.config
89 echo
-e
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZO),CONFIG_INITRAMFS_COMPRESSION_LZO=y\nCONFIG_RD_LZO=y,# CONFIG_INITRAMFS_COMPRESSION_LZO is not set\n# CONFIG_RD_LZO is not set)" >> $(LINUX_DIR
)/.config
90 echo
-e
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_XZ),CONFIG_INITRAMFS_COMPRESSION_XZ=y\nCONFIG_RD_XZ=y,# CONFIG_INITRAMFS_COMPRESSION_XZ is not set\n# CONFIG_RD_XZ is not set)" >> $(LINUX_DIR
)/.config
91 echo
-e
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZ4),CONFIG_INITRAMFS_COMPRESSION_LZ4=y\nCONFIG_RD_LZ4=y,# CONFIG_INITRAMFS_COMPRESSION_LZ4 is not set\n# CONFIG_RD_LZ4 is not set)" >> $(LINUX_DIR
)/.config
92 echo
-e
"$(if $(CONFIG_TARGET_INITRAMFS_COMPRESSION_ZSTD),CONFIG_INITRAMFS_COMPRESSION_ZSTD=y\nCONFIG_RD_ZSTD=y,# CONFIG_INITRAMFS_COMPRESSION_ZSTD is not set\n# CONFIG_RD_ZSTD is not set)" >> $(LINUX_DIR
)/.config
97 define Kernel
/SetNoInitramfs
98 mv
$(LINUX_DIR
)/.config.set
$(LINUX_DIR
)/.config.old
99 grep
-v INITRAMFS
$(LINUX_DIR
)/.config.old
> $(LINUX_DIR
)/.config.set
100 echo
'CONFIG_INITRAMFS_SOURCE=""' >> $(LINUX_DIR
)/.config.set
101 echo
'# CONFIG_INITRAMFS_FORCE is not set' >> $(LINUX_DIR
)/.config.set
104 define Kernel
/Configure
/Default
105 rm -f
$(LINUX_DIR
)/localversion
106 $(LINUX_CONF_CMD
) > $(LINUX_DIR
)/.config.target
107 # copy CONFIG_KERNEL_* settings over to .config.target
108 awk
'/^(#[[:space:]]+)?CONFIG_KERNEL/{sub("CONFIG_KERNEL_","CONFIG_");print}' $(TOPDIR
)/.config
>> $(LINUX_DIR
)/.config.target
109 echo
"# CONFIG_KALLSYMS_EXTRA_PASS is not set" >> $(LINUX_DIR
)/.config.target
110 echo
"# CONFIG_KALLSYMS_ALL is not set" >> $(LINUX_DIR
)/.config.target
111 echo
"CONFIG_KALLSYMS_UNCOMPRESSED=y" >> $(LINUX_DIR
)/.config.target
112 $(SCRIPT_DIR
)/package-metadata.pl kconfig
$(TMP_DIR
)/.packageinfo
$(TOPDIR
)/.config
$(KERNEL_PATCHVER
) > $(LINUX_DIR
)/.config.
override
113 $(SCRIPT_DIR
)/kconfig.pl
'm+' '+' $(LINUX_DIR
)/.config.target
/dev
/null
$(LINUX_DIR
)/.config.
override > $(LINUX_DIR
)/.config.set
114 $(call Kernel
/SetNoInitramfs
)
115 rm -rf
$(KERNEL_BUILD_DIR
)/modules
116 cmp
-s
$(LINUX_DIR
)/.config.set
$(LINUX_DIR
)/.config.prev ||
{ \
117 cp
$(LINUX_DIR
)/.config.set
$(LINUX_DIR
)/.config
; \
118 cp
$(LINUX_DIR
)/.config.set
$(LINUX_DIR
)/.config.prev
; \
120 $(_SINGLE
) [ -d
$(LINUX_DIR
)/user_headers
] ||
$(KERNEL_MAKE
) $(if
$(findstring uml
,$(BOARD
)),ARCH
=$(ARCH
)) INSTALL_HDR_PATH
=$(LINUX_DIR
)/user_headers headers_install
121 grep
'=[ym]' $(LINUX_DIR
)/.config.set | LC_ALL
=C
sort |
$(MKHASH
) md5
> $(LINUX_DIR
)/.vermagic
124 define Kernel
/Configure
/Initramfs
125 $(call Kernel
/SetInitramfs
)
128 define Kernel
/CompileModules
/Default
129 rm -f
$(LINUX_DIR
)/vmlinux
$(LINUX_DIR
)/System.map
130 +$(KERNEL_MAKE
) $(if
$(KERNELNAME
),$(KERNELNAME
),all) modules
131 # If .config did not change, use the previous timestamp to avoid package rebuilds
132 cmp
-s
$(LINUX_DIR
)/.config
$(LINUX_DIR
)/.config.modules.save
&& \
133 mv
$(LINUX_DIR
)/.config.modules.save
$(LINUX_DIR
)/.config
; \
134 $(CP
) $(LINUX_DIR
)/.config
$(LINUX_DIR
)/.config.modules.save
137 OBJCOPY_STRIP
= -R .reginfo
-R .notes
-R .note
-R .comment
-R .mdebug
-R .note.gnu.build-id
139 # AMD64 shares the location with x86
140 ifeq ($(LINUX_KARCH
),x86_64
)
141 IMAGES_DIR
:=..
/..
/x86
/boot
144 define Kernel
/CopyImage
145 cmp
-s
$(LINUX_DIR
)/vmlinux
$(KERNEL_BUILD_DIR
)/vmlinux
$(1).debug ||
{ \
146 $(KERNEL_CROSS
)objcopy
-O binary
$(OBJCOPY_STRIP
) -S
$(LINUX_DIR
)/vmlinux
$(LINUX_KERNEL
)$(1); \
147 $(KERNEL_CROSS
)objcopy
$(OBJCOPY_STRIP
) -S
$(LINUX_DIR
)/vmlinux
$(KERNEL_BUILD_DIR
)/vmlinux
$(1).elf
; \
148 $(CP
) $(LINUX_DIR
)/vmlinux
$(KERNEL_BUILD_DIR
)/vmlinux
$(1).debug
; \
150 $(if
$(KERNEL_IMAGES
),$(KERNEL_IMAGES
),$(filter-out vmlinux dtbs
,$(KERNELNAME
))), \
151 $(CP
) $(LINUX_DIR
)/arch
/$(LINUX_KARCH
)/boot
/$(IMAGES_DIR
)/$(k
) $(KERNEL_BUILD_DIR
)/$(k
)$(1); \
156 # Always add "modules" so a proper Module.symvers file is written that
157 # also contains symbols from the kernel modules. Without these symbols
158 # external packages that depend on exported symbols from kernel modules
159 # will fail to build.
160 define Kernel
/CompileImage
/Default
161 rm -f
$(TARGET_DIR
)/init
162 +$(KERNEL_MAKE
) $(KERNEL_MAKEOPTS_IMAGE
) $(if
$(KERNELNAME
),$(KERNELNAME
),all) modules
163 $(call Kernel
/CopyImage
)
166 # Here as well, always add "modules", see comment above.
167 ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS
),)
168 define Kernel
/CompileImage
/Initramfs
169 $(call Kernel
/Configure
/Initramfs
)
170 $(CP
) $(GENERIC_PLATFORM_DIR
)/other-files
/init
$(TARGET_DIR
)/init
171 $(if
$(SOURCE_DATE_EPOCH
),touch
-hcd
"@$(SOURCE_DATE_EPOCH)" $(TARGET_DIR
) $(TARGET_DIR
)/init
)
172 rm -rf
$(KERNEL_BUILD_DIR
)/linux-
$(LINUX_VERSION
)/usr
/initramfs_data.cpio
*
173 ifeq ($(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE
),y
)
174 ifneq ($(qstrip
$(CONFIG_EXTERNAL_CPIO
)),)
175 $(CP
) $(CONFIG_EXTERNAL_CPIO
) $(KERNEL_BUILD_DIR
)/initrd.cpio
177 ( cd
$(TARGET_DIR
); find . | LC_ALL
=C
sort |
$(STAGING_DIR_HOST
)/bin
/cpio
--reproducible
-o
-H newc
-R
0:0 > $(KERNEL_BUILD_DIR
)/initrd.cpio
)
179 $(if
$(SOURCE_DATE_EPOCH
),touch
-hcd
"@$(SOURCE_DATE_EPOCH)" $(KERNEL_BUILD_DIR
)/initrd.cpio
)
180 $(if
$(CONFIG_TARGET_INITRAMFS_COMPRESSION_BZIP2
),bzip2
-9 -c
< $(KERNEL_BUILD_DIR
)/initrd.cpio
> $(KERNEL_BUILD_DIR
)/initrd.cpio.bzip2
)
181 $(if
$(CONFIG_TARGET_INITRAMFS_COMPRESSION_GZIP
),gzip
-n
-f
-S .gzip
-9n
$(KERNEL_BUILD_DIR
)/initrd.cpio
)
182 $(if
$(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZ4
),$(STAGING_DIR_HOST
)/bin
/lz4c
-l
-c1
-fz
--favor-decSpeed
$(KERNEL_BUILD_DIR
)/initrd.cpio
)
183 $(if
$(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZMA
),$(STAGING_DIR_HOST
)/bin
/lzma e
-lc1
-lp2
-pb2
$(KERNEL_BUILD_DIR
)/initrd.cpio
$(KERNEL_BUILD_DIR
)/initrd.cpio.lzma
)
184 $(if
$(CONFIG_TARGET_INITRAMFS_COMPRESSION_LZO
),$(STAGING_DIR_HOST
)/bin
/lzop
-9 -f
$(KERNEL_BUILD_DIR
)/initrd.cpio
)
185 $(if
$(CONFIG_TARGET_INITRAMFS_COMPRESSION_XZ
),$(STAGING_DIR_HOST
)/bin
/xz
-T
$(if
$(filter 1,$(NPROC
)),2,0) -9 -fz
--check=crc32
$(KERNEL_BUILD_DIR
)/initrd.cpio
)
186 $(if
$(CONFIG_TARGET_INITRAMFS_COMPRESSION_ZSTD
),$(STAGING_DIR_HOST
)/bin
/zstd
-T0
-f
-o
$(KERNEL_BUILD_DIR
)/initrd.cpio.zstd
$(KERNEL_BUILD_DIR
)/initrd.cpio
)
188 +$(KERNEL_MAKE
) $(KERNEL_MAKEOPTS_IMAGE
) $(if
$(KERNELNAME
),$(KERNELNAME
),all) modules
189 $(call Kernel
/CopyImage
,-initramfs
)
192 define Kernel
/CompileImage
/Initramfs
196 define Kernel
/Clean
/Default
197 rm -f
$(KERNEL_BUILD_DIR
)/linux-
$(LINUX_VERSION
)/.configured
198 rm -f
$(LINUX_KERNEL
)
199 $(_SINGLE
)$(MAKE
) -C
$(KERNEL_BUILD_DIR
)/linux-
$(LINUX_VERSION
) clean