On 03/23/12 04:46, Thomas Schmitt wrote:
Hi,
The trick is called "isohybrid".
Luigi Rizzo<ri...@iet.unipi.it> wrote:
interesting. It does work for me indeed.
So why not for Da Rock ?
Starting to feel left out here :)
I tried with your flags to dd (as opposed to those on Ubuntu - bs=1m -
not that I thought it would make much diff), and it got as far as the
last time. It shows isolinux 4.04, blah blah, and a blinking cursor. It
goes no further than that, which I why I commented that it seemed an
unlikely solution.
The system is an Acer AspireOne Netbook D255. I'm using an i386 image
because its only an Atom.
I did test a amd64 system and it worked though... hmmm. I wonder if they
mixed up their images? That'd be a funny cock-up :D
And it might be a nice trick for our images too, so we don't
have to build a memstick and an ISO image...
I would be happy to help with that.
I am the developer of program xorriso which in the role of mkisofs
has composed that Ubuntu image. My knowlege is only about pointing BIOS
to the boot loader start programs, not about those boot systems themselves.
A while ago i exercised the most simple case of
http://wiki.freebsd.org/AvgLiveCD
with the mkisofs emulation of xorriso. It booted.
An MBR can be inserted easily by mkisofs option -G.
isohybrid demands to patch that MBR with the LBA of the boot image
and to set up the DOS partition table. GRUB2 demands only to set up
the partition table. (Special xorrisofs options get employed.)
What would a FreeBSD bootloader MBR need to know about the data in
the ISO image to start up and handle it like a read-only hard disk ?
Do programs of the first boot stages need to know their own LBA in
the image resp. partition ?
The El Torito and MBR equipment of GRUB2 can provide the same functionality
as ISOLINUX with isohybrid. GRUB2 script grub-mkrescue demonstrates this.
I understand Debian GNU/kFreeBSD boots via El Torito and GRUB2. But it
makes no use of the opportunity to have an MBR too.
I boot my own FreeBSD 8-STABLE from hard disk via MBR, GRUB2 and a
chainloaded FreeBSD boot loader.
Have a nice day :)
Thomas
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