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From: Gorka Guardiola <paurea@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] plan9 iso image
Date: Fri, 28 Jun 2013 20:13:03 +0200	[thread overview]
Message-ID: <CACm3i_iS-F4CUs6R8p1HffWVN=7vgpd5RNn12xZ1YLiQe2jmBQ@mail.gmail.com> (raw)
In-Reply-To: <20130628173824.GA225@polynum.com>

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On Fri, Jun 28, 2013 at 7:38 PM, <tlaronde@polynum.com> wrote:

> On Fri, Jun 28, 2013 at 12:40:46PM -0400, erik quanstrom wrote:
> >
> > this iso uses the traditional el-torito method.  unfortunately,
> > the installer is size-constrained (1.44MB) and doesn't support usb.
> >
>
> FWIW (I implemented El-Torito support for GRUB years ago), the image has
> to be some floppy size, and 2.88MB is perfectly supported.
>
> There is also hd emulation, but this it seems not to be widely
> supported by BIOSes.
>
>
There are various ways of booting with El-torito.

http://download.intel.com/support/motherboards/desktop/sb/specscdrom.pdf

One of the ways is non-emulation (I thought it had appeared in a later
version of El-torito,
but checking the spec it was already in version 1,  1995), the byte 1 in
page
19, description in page 16.

Mkisofs lets you create a non-emulation bootable image (see
/sys/src/cmd/disk/9660/boot.c:166, which is set with -B) or an emulation
image.
Emulation goes hand in hand with pbsraw.s.

It used to be that many BIOSes did not support non-emu, but that has not
been true
AFAIK for a long while (at least more than 10 years). As long as you have
the blocks 2M aligned you should be fine with most modern BIOSes.

I think the problem is that the Plan 9 iso is somewhat different than k3b
expects
and it is "fixing" it, although as I said, the iso format is complex enough
and has enough
variants that there may be some error somewhere or the BIOS may have a
bug...

G.

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  reply	other threads:[~2013-06-28 18:13 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-28 16:27 Terry Wendt
2013-06-28 16:40 ` erik quanstrom
2013-06-28 17:12   ` Terry Wendt
2013-06-28 17:17     ` Paul A. Patience
2013-06-28 17:12   ` Gorka Guardiola
2013-06-28 17:19     ` erik quanstrom
2013-06-28 17:43       ` Gorka Guardiola
2013-06-28 17:50         ` Terry Wendt
2013-06-28 18:13         ` erik quanstrom
2013-06-28 17:38   ` tlaronde
2013-06-28 18:13     ` Gorka Guardiola [this message]
2013-06-28 18:16       ` Gorka Guardiola
2013-06-28 18:41       ` Gorka Guardiola
2013-06-28 18:50         ` erik quanstrom
2013-06-28 18:57           ` Gorka Guardiola
2013-06-28 20:06             ` Gorka Guardiola
2013-06-28 20:13               ` Gorka Guardiola
2013-06-28 20:20                 ` Gorka Guardiola
2013-06-28 20:36                   ` Gorka Guardiola
2013-06-28 17:06 ` Gorka Guardiola
2013-06-28 17:15   ` Terry Wendt

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