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