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

[Darren Hart <dvhart@linux.intel.com>]

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.

--
Darren

> 
> [YOCTO #1763 partial]
> 
> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
> ---
> diff --git a/meta/classes/bootimg.bbclass b/meta/classes/bootimg.bbclass
> index f4981d8..370b378 100644
> --- a/meta/classes/bootimg.bbclass
> +++ b/meta/classes/bootimg.bbclass
> @@ -103,6 +103,8 @@ build_iso() {
>  			-r ${ISODIR}
>  	fi
>  
> +	isohybrid ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso
> +
>  	cd ${DEPLOY_DIR_IMAGE}
>  	rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
>  	ln -s ${IMAGE_NAME}.iso ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
> 
> 
> 
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-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel