Re: [PATCH] bootimg.bbclass: Tweak iso images to become hybrid images

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Mon, 2012-04-23 at 08:37 -0700, Darren Hart wrote:
> 
> On 04/19/2012 03:02 PM, Richard Purdie wrote:
> > From: Damien Lespiau <damien.lespiau@intel.com>
> > 
> > This allows iso images to be written to usb keys and booted on systems which
> > have a BIOS which support this. There is no real down side to tweaking the iso
> > images in this way.
> 
> I like the idea, but there does appear to be one potential downside.
> From the syslinux isolinux.txt documentation:
> 
> "The ISO 9660 filesystem is encapsulated in a partition (which starts
> at offset zero, which may confuse some systems.)"
> 
> How many different systems and firmware has this been tested on?
> 
> I think it is a worthwhile patch, but we should be aware of the above in
> case a regression is reported. In such an event, it seems a
> NO_ISO_HYBRID flag could be set by the machine.conf to revert to the
> older behavior.

Agreed, I think we should try this and see if there are any problems
reported. I tested a few machines here and it seemed to work on most of
them but this was with a USB key, not a CD image. This is probably our
more common use case though.

Cheers,

Richard