Hi, This updates bootconfig tool to align the total size of initrd + bootconfig to 4. To adjust the file size, the bootconfig tool adds padding null characters in between the boot configuration data and the footer.
This series include Documentation update. The changing points are - The bootconfig applied initrd image size is aligned to 4. - To insert the padding null ('\0') bytes, the size in the footer can be bigger than the actual bootconfig file size. - But the max size of the boot configuration file is same, because the max size doesn't include the last null characters. For this version I decided to keep 4 bytes aligned rather than longer size. It will be easy to expand it to e.g. 32 bytes (in this series, we just need to update 3 locations of the code), but I couldn't find any reason to expand it. Only I could found was that the grub can align the filesize to 4, and U-Boot/EDK2 will not change it. So I couldn't say what is the best size. Anyway, I updated the documentation too, which clearly says that the above changing points, and if the bootloader pass the wrong size, kernel will not find bootconfig from the initrd. Thank you, --- Masami Hiramatsu (2): tools/bootconfig: Align the bootconfig applied initrd image size to 4 Documentation: bootconfig: Update file format on initrd image Documentation/admin-guide/bootconfig.rst | 18 ++++++++++++---- include/linux/bootconfig.h | 1 + tools/bootconfig/main.c | 33 +++++++++++++++++++++++++----- tools/bootconfig/test-bootconfig.sh | 6 +++++ 4 files changed, 47 insertions(+), 11 deletions(-) -- Masami Hiramatsu (Linaro) <mhira...@kernel.org>