• A
    bzip2/lzma: fix built-in initramfs vs CONFIG_RD_GZIP · a26ee60f
    Alain Knaff 提交于
    Impact: Resolves build failures in some configurations
    
    Makes it possible to disable CONFIG_RD_GZIP . In that case, the
    built-in initramfs will be compressed by whatever compressor is
    available (bzip2 or lzma) or left uncompressed if none is available.
    
    It also removes a couple of warnings which occur when no ramdisk
    compression at all is chosen.
    
    It also restores the select ZLIB_INFLATE in drivers/block/Kconfig
    which somehow came missing. This is needed to activate compilation of
    the stuff in zlib_deflate.
    Signed-off-by: NAlain Knaff <alain@knaff.lu>
    Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
    a26ee60f
initramfs_data.bz2.S 1.0 KB
/*
  initramfs_data includes the compressed binary that is the
  filesystem used for early user space.
  Note: Older versions of "as" (prior to binutils 2.11.90.0.23
  released on 2001-07-14) dit not support .incbin.
  If you are forced to use older binutils than that then the
  following trick can be applied to create the resulting binary:


  ld -m elf_i386  --format binary --oformat elf32-i386 -r \
  -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o
   ld -m elf_i386  -r -o built-in.o initramfs_data.o

  initramfs_data.scr looks like this:
SECTIONS
{
       .init.ramfs : { *(.data) }
}

  The above example is for i386 - the parameters vary from architectures.
  Eventually look up LDFLAGS_BLOB in an older version of the
  arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced.

  Using .incbin has the advantage over ld that the correct flags are set
  in the ELF header, as required by certain architectures.
*/

.section .init.ramfs,"a"
.incbin "usr/initramfs_data.cpio.bz2"
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