path: root/usr/initramfs_data.gz.S
diff options
authorAlain Knaff <alain@knaff.lu>2009-01-07 00:10:27 -0800
committerH. Peter Anvin <hpa@zytor.com>2009-01-07 00:10:27 -0800
commita26ee60f90daffe1de6be0d093af86e7279b3dfd (patch)
tree01239fb6b173ff46711480b9601c69b92e1715a5 /usr/initramfs_data.gz.S
parentfb9a4ca9820fd4d7c4906bd393004662451e273e (diff)
bzip2/lzma: fix built-in initramfs vs CONFIG_RD_GZIP
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: Alain Knaff <alain@knaff.lu> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'usr/initramfs_data.gz.S')
1 files changed, 29 insertions, 0 deletions
diff --git a/usr/initramfs_data.gz.S b/usr/initramfs_data.gz.S
new file mode 100644
index 000000000000..890c8dd1d6bd
--- /dev/null
+++ b/usr/initramfs_data.gz.S
@@ -0,0 +1,29 @@
+ initramfs_data includes the compressed binary that is the
+ filesystem used for early user space.
+ Note: Older versions of "as" (prior to binutils
+ 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:
+ .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.gz"

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