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:
>> 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
>> 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.
Steve McIntyre, Cambridge, UK. email@example.com
"Every time you use Tcl, God kills a kitten." -- Malcolm Ray