Re: Doubts about Debian8.1 DVD ppc64el image

[Ramon Medeiros <ramonn@linux.vnet.ibm.com>]

On 06/11/2015 05:23 PM, Thomas Schmitt wrote:
> Hi,
>
> > Our algorithm is
> > failing to discover if this iso[1] is bootable.
> I am curious to learn about the expectations of that algorithm.
>
> The ISO looks like being bootable via CHRP.
>  From my cheatsheet
>    http://bazaar.launchpad.net/~libburnia-team/libisofs/scdbackup/view/head:/doc/boot_sectors.txt
> "CHRP is marked by an MBR partition entry of type 0x96 spanning the whole
>   ISO 9660 image."
>
> I cannot spot "ppc64el" in
> http://cdimage.debian.org/mirror/cdimage/archive/latest-oldstable/powerpc/iso-cd/
> Old-stable "powerpc" was made by genisoimage rather than xorriso.
> It has an Apple Partition Map additionally to the CHRP MBR,
> probably pointing to a HFS filesystem.
>
> So if your algorithm looks for magic number {'E','R'}
> at the start of the file, that would be what's missing in "ppc64el"
> ISOs. (Together with the HFS, of course.)
>
> --------------------------------------------------------------------
> In case this does not yet explain the riddle:
>
> What was the most recent ISO which passed your tests ?
Debian 7.8 works well.
> Can you run GNU xorriso >= 1.3.8 on that ISO ?
> (Debian's xorriso is still at 1.3.2, i fear.)	
>
>    xorriso -indev ...iso \
>            -report_el_torito plain \
>            -report_system_area plain \
>            -pvd_info
i will make this test later. ASAP i send the results
> Have a nice day :)
>
> Thomas

--

Ramon Nunes Medeiros
Kimchi Developer
Linux Technology Center Brazil
IBM Systems & Technology Group
Phone : +55 19 2132 7878
ramonn@br.ibm.com