• Daniel M. Weeks's avatar
    scripts/gen_initramfs_list.sh: fix flags for initramfs LZ4 compression · 5ec384d4
    Daniel M. Weeks authored
    LZ4 as implemented in the kernel differs from the default method now
    used by the reference implementation of LZ4.  Until the in-kernel method
    is updated to support the new default, passing the legacy flag (-l) to
    the compressor is necessary.  Without this flag the kernel-generated,
    LZ4-compressed initramfs is junk.
    
    Kyungsik said:
    
    : It seems that lz4 supports legacy format with the same option as lz4c
    : does.  Just looking at the first few bytes of lz4 compressed image, we can
    : see whether it is new format or not.
    :
    : It shows new format magic number without this patch.  New format magic
    : number is 0x184d2204.
    :
    : $ hexdump -C ./initramfs_data.cpio.lz4 |more
    : 00000000  04 22 4d 18 64 70 b9 69 (Little Endian)
    : ...
    :
    : Currently kernel supports legacy format only.
    Signed-off-by: default avatarDaniel M. Weeks <dan@danweeks.net>
    Cc: Michal Marek <mmarek@suse.cz>
    Acked-by: default avatarKyungsik Lee <kyungsik.lee@lge.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    5ec384d4
gen_initramfs_list.sh 7.87 KB