[bgl-discuss] elf format ramdisk for I/O node

[Kazutomo Yoshii <kazutomo@xxxxxxxxxxx>]

Hi,

I made tools to extract gzip'ed ramdisk from elf ramdisk
and create elf ramdisk with your gzip'ed ramdisk.

Here is quick usage

# ./extract-gzrd ramdisk.elf rd.gz
extract rd.gz from ramdisk.elf

# ./create-elfrd rd.gz newramdisk.elf
create newramdisk.elf with rd.gz

you can find them at bgl.mcs.anl.gov:/home/kazutomo/bin/
( I'll put the source code to cvs tomorrow. )

It works on both ppc(BigEndian) and x86(little endian).

You can also create your elf ramdisk using the gnu ld command
on ppc platoform. information from Pete

# ${CROSS}ld -b binary -e 0 -o ramdisk.img.elf ramdisk.img.gz
# ${CROSS}ld -T ramdisk.lds -o ramdisk.elf
# cat ramdisk.lds
OUTPUT_ARCH(powerpc)
SECTIONS
{
.data 0x1000000: {
LONG(0xf0e1d2c3);
LONG(ramdisk_end - ramdisk_start);
ramdisk_start = .;
ramdisk.img.elf
ramdisk_end = .;
}
}

8 bytes at the beginning of data is tricky...

Thanks,
Kaz



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