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kbuild: add target to build a cpio containing modules 

Add a new package target to build a cpio archive containing the kernel
modules. This is particularly useful to supplement an existing initramfs
with the kernel modules so that the root filesystem can be started with
all needed kernel modules without modifying it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Co-developed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nicolas Schier <nsc@kernel.org>
Link: https://patch.msgid.link/20251125-cpio-modules-pkg-v2-2-aa8277d89682@pengutronix.de
Signed-off-by: Nicolas Schier <nsc@kernel.org>
pull/1354/merge
Sascha Hauer 2025-11-25 14:18:20 +01:00 committed by Nicolas Schier
parent c83c9564cd
commit 2a9c8c0b59
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1 changed files with 20 additions and 0 deletions
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20
scripts/Makefile.package
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@ -189,6 +189,25 @@ tar-pkg: linux-$(KERNELRELEASE)-$(ARCH).tar
tar%-pkg: linux-$(KERNELRELEASE)-$(ARCH).tar.% FORCE tar%-pkg: linux-$(KERNELRELEASE)-$(ARCH).tar.% FORCE
@: @:
# modules-cpio-pkg - generate an initramfs with the modules
# ---------------------------------------------------------------------------
.tmp_modules_cpio: FORCE
$(Q)$(MAKE) -f $(srctree)/Makefile
$(Q)rm -rf $@
$(Q)$(MAKE) -f $(srctree)/Makefile INSTALL_MOD_PATH=$@ modules_install
quiet_cmd_cpio = CPIO $@
cmd_cpio = $(CONFIG_SHELL) $(srctree)/usr/gen_initramfs.sh -o $@ $<
modules-$(KERNELRELEASE)-$(ARCH).cpio: .tmp_modules_cpio
$(Q)$(MAKE) $(build)=usr usr/gen_init_cpio
$(call cmd,cpio)
PHONY += modules-cpio-pkg
modules-cpio-pkg: modules-$(KERNELRELEASE)-$(ARCH).cpio
@:
# perf-tar*-src-pkg - generate a source tarball with perf source # perf-tar*-src-pkg - generate a source tarball with perf source
# --------------------------------------------------------------------------- # ---------------------------------------------------------------------------
@ -245,6 +264,7 @@ help:
@echo ' tarbz2-pkg - Build the kernel as a bzip2 compressed tarball' @echo ' tarbz2-pkg - Build the kernel as a bzip2 compressed tarball'
@echo ' tarxz-pkg - Build the kernel as a xz compressed tarball' @echo ' tarxz-pkg - Build the kernel as a xz compressed tarball'
@echo ' tarzst-pkg - Build the kernel as a zstd compressed tarball' @echo ' tarzst-pkg - Build the kernel as a zstd compressed tarball'
@echo ' modules-cpio-pkg - Build the kernel modules as cpio archive'
@echo ' perf-tar-src-pkg - Build the perf source tarball with no compression' @echo ' perf-tar-src-pkg - Build the perf source tarball with no compression'
@echo ' perf-targz-src-pkg - Build the perf source tarball with gzip compression' @echo ' perf-targz-src-pkg - Build the perf source tarball with gzip compression'
@echo ' perf-tarbz2-src-pkg - Build the perf source tarball with bz2 compression' @echo ' perf-tarbz2-src-pkg - Build the perf source tarball with bz2 compression'