| 1 | /*
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| 2 | initramfs_data includes the compressed binary that is the
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| 3 | filesystem used for early user space.
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| 4 | Note: Older versions of "as" (prior to binutils 2.11.90.0.23
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| 5 | released on 2001-07-14) dit not support .incbin.
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| 6 | If you are forced to use older binutils than that then the
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| 7 | following trick can be applied to create the resulting binary:
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| 8 |
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| 9 |
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| 10 | ld -m elf_i386 --format binary --oformat elf32-i386 -r \
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| 11 | -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o
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| 12 | ld -m elf_i386 -r -o built-in.o initramfs_data.o
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| 13 |
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| 14 | initramfs_data.scr looks like this:
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| 15 | SECTIONS
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| 16 | {
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| 17 | .init.ramfs : { *(.data) }
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| 18 | }
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| 19 |
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| 20 | The above example is for i386 - the parameters vary from architectures.
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| 21 | Eventually look up LDFLAGS_BLOB in an older version of the
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| 22 | arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced.
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| 23 |
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| 24 | Using .incbin has the advantage over ld that the correct flags are set
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| 25 | in the ELF header, as required by certain architectures.
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| 26 | */
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| 27 |
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| 28 | .section .init.ramfs,"a"
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| 29 | .incbin "usr/initramfs_data.cpio.gz"
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| 30 |
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