Hi, Here are the 4th version of the patchset to enable kernel embedded bootconfig for non-initrd kernel boot environment. I've fixed Makefile to determine update by checking the contents of embedding bootconfig file with filechk macro. Thanks Masahiro! Here is the previous version [1] (sorry, I missed to update the version tag in that series) [1] https://lore.kernel.org/all/164724890153.731226.1478494969800777757.stgit@devnote2/T/#u You can embed a bootconfig file into the kernel as a default bootconfig, which will be used if there is no initrd or no bootconfig is attached to initrd. This needs 2 options: CONFIG_EMBED_BOOT_CONFIG=y and set the file path to CONFIG_EMBED_BOOT_CONFIG_FILE. Even if you embed the bootconfig file to the kernel, it will not be enabled unless you pass "bootconfig" kernel command line option at boot. Moreover, since this is just a "default" bootconfig, you can override it with a new bootconfig if you attach another bootconfig to the initrd (if possible). CONFIG_EMBED_BOOT_CONFIG_FILE can take both absolute and relative path, but to simplify and make it independent from the build environment, I recommend you to use an absolute path for that. This is requested by Padmanabha at the below thread[2]; [2] https://lore.kernel.org/all/20220307184011.GA2570@pswork/T/#u KNOWN ISSUE: According to the report from Padmanabha[3], the embedded bootconfig data may not be updated if you do incremental build the kernel with CONFIG_LTO. This is under investigation. [3] https://lore.kernel.org/all/20220321183500.GA4065@pswork/T/#u Thank you, --- Masami Hiramatsu (3): bootconfig: Check the checksum before removing the bootconfig from initrd bootconfig: Support embedding a bootconfig file in kernel docs: bootconfig: Add how to embed the bootconfig into kernel Documentation/admin-guide/bootconfig.rst | 30 ++++++++++++++++++++++++++--- include/linux/bootconfig.h | 10 ++++++++++ init/Kconfig | 21 ++++++++++++++++++++ init/main.c | 31 +++++++++++++++--------------- lib/.gitignore | 1 + lib/Makefile | 10 ++++++++++ lib/bootconfig.c | 23 ++++++++++++++++++++++ 7 files changed, 108 insertions(+), 18 deletions(-) -- Masami Hiramatsu (Linaro) <mhiramat@xxxxxxxxxx>
