package/linux-headers: add support for fetching from custom tarball/git
Add support for building toolchains against custom headers. Allows
the selection of a manual version, custom tarball or custom git
repository for the kernel headers. This enables toolchains to be
built against custom kernel headers without having to build a full
kernel.
This is particularly useful for new architectures, such as RISC-V
where updated kernel headers may not have made it into the mainline
kernel yet.
Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
diff --git a/package/linux-headers/Config.in.host b/package/linux-headers/Config.in.host
index 53f684b..b12ea69 100644
--- a/package/linux-headers/Config.in.host
+++ b/package/linux-headers/Config.in.host
@@ -70,6 +70,23 @@
URL at kernel.org. Instead, select "Custom tarball" and
specify the right URL directly.
+config BR2_KERNEL_HEADERS_CUSTOM_TARBALL
+ bool "Custom tarball"
+ help
+ This option allows you to specify a URL pointing to a kernel
+ source tarball. This URL can use any protocol recognized by
+ Buildroot, like http://, ftp://, file:// or scp://.
+
+ When pointing to a local tarball using file://, you may want
+ to use a make variable like $(TOPDIR) to reference the root of
+ the Buildroot tree.
+
+config BR2_KERNEL_HEADERS_CUSTOM_GIT
+ bool "Custom Git repository"
+ help
+ This option allows Buildroot to get the Linux kernel source
+ code from a Git repository.
+
endchoice
config BR2_DEFAULT_KERNEL_VERSION
@@ -79,9 +96,27 @@
Specify the version you want to use.
E.G.: 3.6.10
+config BR2_KERNEL_HEADERS_CUSTOM_TARBALL_LOCATION
+ string "URL of custom kernel tarball"
+ depends on BR2_KERNEL_HEADERS_CUSTOM_TARBALL
+
+if BR2_KERNEL_HEADERS_CUSTOM_GIT
+
+config BR2_KERNEL_HEADERS_CUSTOM_REPO_URL
+ string "URL of custom repository"
+
+config BR2_KERNEL_HEADERS_CUSTOM_REPO_VERSION
+ string "Custom repository version"
+ help
+ Revision to use in the typical format used by
+ Git/Mercurial/Subversion E.G. a sha id, a tag, branch, ..
+
+endif
+
choice
bool "Custom kernel headers series"
- depends on BR2_KERNEL_HEADERS_VERSION || BR2_KERNEL_HEADERS_AS_KERNEL
+ depends on BR2_KERNEL_HEADERS_VERSION || BR2_KERNEL_HEADERS_AS_KERNEL || \
+ BR2_KERNEL_HEADERS_CUSTOM_TARBALL || BR2_KERNEL_HEADERS_CUSTOM_GIT
help
Specify the kernel headers series you manually selected,
above.
@@ -260,3 +295,6 @@
default "4.16.18" if BR2_KERNEL_HEADERS_4_16
default "4.18.9" if BR2_KERNEL_HEADERS_4_18
default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
+ default "custom" if BR2_KERNEL_HEADERS_CUSTOM_TARBALL
+ default BR2_KERNEL_HEADERS_CUSTOM_REPO_VERSION \
+ if BR2_KERNEL_HEADERS_CUSTOM_GIT
diff --git a/package/linux-headers/linux-headers.mk b/package/linux-headers/linux-headers.mk
index 994bd62..45e1768 100644
--- a/package/linux-headers/linux-headers.mk
+++ b/package/linux-headers/linux-headers.mk
@@ -18,13 +18,13 @@
LINUX_HEADERS_CUSTOM_TARBALL_LOCATION = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
LINUX_HEADERS_REPO_URL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
else # ! BR2_KERNEL_HEADERS_AS_KERNEL
-LINUX_HEADERS_CUSTOM_TARBALL =
-LINUX_HEADERS_CUSTOM_GIT =
+LINUX_HEADERS_CUSTOM_TARBALL = $(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL))
+LINUX_HEADERS_CUSTOM_GIT = $(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_GIT))
LINUX_HEADERS_CUSTOM_HG =
LINUX_HEADERS_CUSTOM_SVN =
LINUX_HEADERS_VERSION = $(call qstrip,$(BR2_DEFAULT_KERNEL_HEADERS))
-LINUX_HEADERS_CUSTOM_TARBALL_LOCATION =
-LINUX_HEADERS_REPO_URL =
+LINUX_HEADERS_CUSTOM_TARBALL_LOCATION = $(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL_LOCATION))
+LINUX_HEADERS_REPO_URL = $(call qstrip,$(BR2_KERNEL_HEADERS_CUSTOM_REPO_URL))
endif # BR2_KERNEL_HEADERS_AS_KERNEL
# Configure tarball filenames.
@@ -90,7 +90,7 @@
endif # BR2_KERNEL_HEADERS_AS_KERNEL
# Skip hash checking for custom kernel headers.
-ifeq ($(BR2_KERNEL_HEADERS_VERSION),y)
+ifeq ($(BR2_KERNEL_HEADERS_VERSION)$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL)$(BR2_KERNEL_HEADERS_CUSTOM_GIT),y)
BR_NO_CHECK_HASH_FOR += $(LINUX_HEADERS_SOURCE)
endif
@@ -137,7 +137,7 @@
headers_install)
endef
-ifeq ($(BR2_KERNEL_HEADERS_VERSION)$(BR2_KERNEL_HEADERS_AS_KERNEL),y)
+ifeq ($(BR2_KERNEL_HEADERS_VERSION)$(BR2_KERNEL_HEADERS_AS_KERNEL)$(BR2_KERNEL_HEADERS_CUSTOM_TARBALL)$(BR2_KERNEL_HEADERS_CUSTOM_GIT),y)
define LINUX_HEADERS_CHECK_VERSION
$(call check_kernel_headers_version,\
$(STAGING_DIR),\
