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

[Rob Ross <rross@xxxxxxxxxxx>]

Cool!  I'll keep after the IBM guys and see if we can get a toolchain for 
building code for the IO nodes too.

Rob

On Tue, 8 Feb 2005, Kazutomo Yoshii wrote:

> 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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