c7659540733006a5ac8eb714afa15972087abb65
[packages/trusty/cirros-testvm.git] / cirros-testvm / src-cirros / buildroot-2015.05 / linux / linux.mk
1 ################################################################################
2 #
3 # Linux kernel target
4 #
5 ################################################################################
6
7 LINUX_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
8 LINUX_LICENSE = GPLv2
9 LINUX_LICENSE_FILES = COPYING
10
11 # Compute LINUX_SOURCE and LINUX_SITE from the configuration
12 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
13 LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
14 LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
15 LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
16 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
17 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_LOCAL),y)
18 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH))
19 LINUX_SITE_METHOD = local
20 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
21 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
22 LINUX_SITE_METHOD = git
23 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
24 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
25 LINUX_SITE_METHOD = hg
26 else
27 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
28 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_VERSION),y)
29 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
30 endif
31 ifeq ($(BR2_LINUX_KERNEL_SAME_AS_HEADERS)$(BR2_KERNEL_HEADERS_VERSION),yy)
32 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
33 endif
34 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
35 # to use the $(word) function. We support versions such as 4.0, 3.1,
36 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
37 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
38 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
39 else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
40 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
41 else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
42 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
43 endif
44 # release candidates are in testing/ subdir
45 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
46 LINUX_SITE := $(LINUX_SITE)/testing
47 endif # -rc
48 endif
49
50 LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
51
52 # We rely on the generic package infrastructure to download and apply
53 # remote patches (downloaded from ftp, http or https). For local
54 # patches, we can't rely on that infrastructure, because there might
55 # be directories in the patch list (unlike for other packages).
56 LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
57
58 LINUX_INSTALL_IMAGES = YES
59 LINUX_DEPENDENCIES += host-kmod host-lzop
60
61 ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
62 LINUX_DEPENDENCIES += host-uboot-tools
63 endif
64
65 LINUX_MAKE_FLAGS = \
66         HOSTCC="$(HOSTCC)" \
67         HOSTCFLAGS="$(HOSTCFLAGS)" \
68         ARCH=$(KERNEL_ARCH) \
69         INSTALL_MOD_PATH=$(TARGET_DIR) \
70         CROSS_COMPILE="$(CCACHE) $(TARGET_CROSS)" \
71         DEPMOD=$(HOST_DIR)/sbin/depmod
72
73 LINUX_MAKE_ENV = \
74         $(TARGET_MAKE_ENV) \
75         BR_BINARIES_DIR=$(BINARIES_DIR)
76
77 # Get the real Linux version, which tells us where kernel modules are
78 # going to be installed in the target filesystem.
79 LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
80
81 ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
82 KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
83 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
84 # We keep only the .dts files, so that the user can specify both .dts
85 # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
86 # copied to arch/<arch>/boot/dts, but only the .dts files will
87 # actually be generated as .dtb.
88 KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
89 endif
90
91 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
92 $(error No kernel device tree source specified, check your \
93 BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
94 endif
95
96 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
97 ifneq ($(words $(KERNEL_DTS_NAME)),1)
98 $(error Kernel with appended device tree needs exactly one DTS source. \
99         Check BR2_LINUX_KERNEL_INTREE_DTS_NAME or BR2_LINUX_KERNEL_CUSTOM_DTS_PATH.)
100 endif
101 endif
102
103 KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
104
105 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
106 LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
107 LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
108 ifeq ($(LINUX_IMAGE_NAME),)
109 LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
110 endif
111 else
112 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
113 LINUX_IMAGE_NAME = uImage
114 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
115 LINUX_IMAGE_NAME = uImage
116 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
117 LINUX_IMAGE_NAME = bzImage
118 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
119 LINUX_IMAGE_NAME = zImage
120 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
121 LINUX_IMAGE_NAME = zImage
122 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
123 LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
124 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
125 LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
126 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
127 LINUX_IMAGE_NAME = linux.bin
128 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
129 LINUX_IMAGE_NAME = vmlinux.bin
130 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
131 LINUX_IMAGE_NAME = vmlinux
132 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
133 LINUX_IMAGE_NAME = vmlinuz
134 endif
135 # The if-else blocks above are all the image types we know of, and all
136 # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
137 # to something
138 LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
139 endif
140
141 LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
142 ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
143 LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
144 endif
145
146 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
147 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
148 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
149 # defconfig file.
150 ifeq ($(KERNEL_ARCH),i386)
151 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
152 else ifeq ($(KERNEL_ARCH),x86_64)
153 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
154 else
155 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
156 endif
157
158 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
159 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
160 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
161 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
162 else
163 LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
164 endif # BR2_LINUX_KERNEL_VMLINUX
165
166 define LINUX_APPLY_LOCAL_PATCHES
167         for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
168                 if test -d $$p ; then \
169                         $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
170                 else \
171                         $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
172                 fi \
173         done
174 endef
175
176 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
177
178 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
179 KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
180 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
181 KERNEL_SOURCE_CONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
182 endif
183
184 LINUX_KCONFIG_FILE = $(KERNEL_SOURCE_CONFIG)
185 LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
186 LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
187
188 define LINUX_KCONFIG_FIXUP_CMDS
189         $(if $(BR2_arm)$(BR2_armeb),
190                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
191         $(if $(BR2_TARGET_ROOTFS_CPIO),
192                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
193         # As the kernel gets compiled before root filesystems are
194         # built, we create a fake cpio file. It'll be
195         # replaced later by the real cpio archive, and the kernel will be
196         # rebuilt using the linux-rebuild-with-initramfs target.
197         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
198                 touch $(BINARIES_DIR)/rootfs.cpio
199                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
200                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
201                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
202         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
203                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
204                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
205         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
206                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
207         $(if $(BR2_PACKAGE_KTAP),
208                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
209                 $(call KCONFIG_ENABLE_OPT,CONFIG_EVENT_TRACING,$(@D)/.config)
210                 $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
211                 $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
212         $(if $(BR2_PACKAGE_SYSTEMD),
213                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
214                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
215                 $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
216                 $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
217                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
218                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_XATTR,$(@D)/.config))
219         $(if $(BR2_PACKAGE_SMACK),
220                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
221                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
222                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
223         $(if $(BR2_PACKAGE_IPTABLES),
224                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
225                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
226                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
227                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
228         $(if $(BR2_PACKAGE_XTABLES_ADDONS),
229                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
230                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
231         $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
232                 $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
233 endef
234
235 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
236 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
237 define LINUX_BUILD_DTB
238         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
239 endef
240 define LINUX_INSTALL_DTB
241         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
242         cp $(addprefix \
243                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
244                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
245                 $(BINARIES_DIR)/
246 endef
247 define LINUX_INSTALL_DTB_TARGET
248         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
249         cp $(addprefix \
250                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
251                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
252                 $(TARGET_DIR)/boot/
253 endef
254 endif
255 endif
256
257 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
258 # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
259 define LINUX_APPEND_DTB
260         if [ -e $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb ]; then \
261                 cat $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb; \
262         else \
263                 cat $(KERNEL_ARCH_PATH)/boot/dts/$(KERNEL_DTS_NAME).dtb; \
264         fi >> $(KERNEL_ARCH_PATH)/boot/zImage
265 endef
266 ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
267 # We need to generate a new u-boot image that takes into
268 # account the extra-size added by the device tree at the end
269 # of the image. To do so, we first need to retrieve both load
270 # address and entry point for the kernel from the already
271 # generate uboot image before using mkimage -l.
272 LINUX_APPEND_DTB += $(sep) MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
273         sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
274         $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
275         -T kernel -C none $${MKIMAGE_ARGS} \
276         -d $(KERNEL_ARCH_PATH)/boot/zImage $(LINUX_IMAGE_PATH);
277 endif
278 endif
279
280 # Compilation. We make sure the kernel gets rebuilt when the
281 # configuration has changed.
282 define LINUX_BUILD_CMDS
283         $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
284                 cp $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
285         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
286         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
287                 $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;        \
288         fi
289         $(LINUX_BUILD_DTB)
290         $(LINUX_APPEND_DTB)
291 endef
292
293
294 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
295 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
296         install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
297         $(LINUX_INSTALL_DTB_TARGET)
298 endef
299 endif
300
301
302 define LINUX_INSTALL_HOST_TOOLS
303         # Installing dtc (device tree compiler) as host tool, if selected
304         if grep -q "CONFIG_DTC=y" $(@D)/.config; then   \
305                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/dtc ;   \
306         fi
307 endef
308
309
310 define LINUX_INSTALL_IMAGES_CMDS
311         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
312         $(LINUX_INSTALL_DTB)
313 endef
314
315 define LINUX_INSTALL_TARGET_CMDS
316         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
317         # Install modules and remove symbolic links pointing to build
318         # directories, not relevant on the target
319         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
320                 $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
321                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
322                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
323         fi
324         $(LINUX_INSTALL_HOST_TOOLS)
325 endef
326
327 # Note: our package infrastructure uses the full-path of the last-scanned
328 # Makefile to determine what package we're currently defining, using the
329 # last directory component in the path. As such, including other Makefile,
330 # like below, before we call one of the *-package macro is usally not
331 # working.
332 # However, since the files we include here are in the same directory as
333 # the current Makefile, we are OK. But this is a hard requirement: files
334 # included here *must* be in the same directory!
335 include $(sort $(wildcard linux/linux-ext-*.mk))
336
337 LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
338         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
339
340 LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
341         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
342                 $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
343
344 $(eval $(kconfig-package))
345
346 # Support for rebuilding the kernel after the cpio archive has
347 # been generated in $(BINARIES_DIR)/rootfs.cpio.
348 $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
349         @$(call MESSAGE,"Rebuilding kernel with initramfs")
350         # Build the kernel.
351         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
352         $(LINUX_APPEND_DTB)
353         # Copy the kernel image to its final destination
354         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
355         # If there is a .ub file copy it to the final destination
356         test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
357         $(Q)touch $@
358
359 # The initramfs building code must make sure this target gets called
360 # after it generated the initramfs list of files.
361 linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
362
363 # Checks to give errors that the user can understand
364 ifeq ($(BR_BUILDING),y)
365 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
366 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
367 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
368 endif
369 endif
370
371 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
372 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
373 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
374 endif
375 endif
376
377 endif