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Re: Bits from the debian-cd team; more CD/DVDs being built regularly

On Thu, Dec 28, 2006 at 08:32:28PM +0000, Thiemo Seufer wrote:
>Steve McIntyre wrote:
>> mips
>> ====
>> jealously scribbles all over the first 512 bytes
>I figure that's a DVH "Disk Volume Header" as used on SGI machines.

Yup, exactly. I borrowed the layout from your own genisovh
program... :-)

>> mipsel
>> ======
>> bytes 000-008 : 0-padding
>>       008-011 : magic header
>>       012-015 : boot mode
>>       016-019 : load address
>>       020-023 : exec address
>>       024-027 : boot file length
>>       028-031 : boot file location
>Looks like an Ultrix boot record for a DECstation.
>That's a list of boot file extents and their locations. For an ISO
>we can assume contiguous files, so it makes no difference in that case.
>> (otherwise blank - may contain other boot files, but we don't use it)
>There's only a single boot file. As a sidenote, there are other
>mips/mipsel system architectures with different firmware and disk
>layout conventions. This makes even building a CD which boots on
>all mips systems tricky.

Yeah... :-/

Steve McIntyre, Cambridge, UK.                                steve@einval.com
"Every time you use Tcl, God kills a kitten." -- Malcolm Ray

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