[yocto] Perplexed by boot mechanism

[Sean Liming]

> -----Original Message-----
> From: yocto-bounces at yoctoproject.org [mailto:yocto-
> bounces at yoctoproject.org] On Behalf Of Paul D. DeRocco
> Sent: Friday, March 22, 2013 4:06 PM
> To: yocto at yoctoproject.org
> Subject: [yocto] Perplexed by boot mechanism
> 
> I'm trying to get a core-image-base-cedartrail-nopvr image to boot from an
> eUSB SSD on an Intel Atom mobo. I'm following the instructions in
> 
> <https://www.yoctoproject.org/download/intel-atom-n2600n2800d2550-
> wnm10-chip
> set-cedar-trail>
> 
> which tell me to dd the .hddimg file onto the flash drive. But apparently,
the
> image isn't an image of a regular bootable system drive, but is a "live
image"
> of a smaller system that can either boot the real system from a
virtualized file
> system in RAM whose image is read from a single file in the first level,
or it
> can install the real system to a different drive.
> (Correct me if I'm mistaken about any of this.)
> 
> What's the point of all this? It seems like a completely unnecessary layer
of
> complexity and inefficiency. I have a very vague understanding of the
whole
> concept of running a live image off a virtual file system, and it seems to
make
> sense when you're booting off a readonly medium like a DVD, but this is a
> writable flash drive. Why doesn't the .hddimg file just contain the real
target
> root file system partition in it? Or is that what some of those other
files in the
> build/tmp/deploy/images directory represent? If the latter, is there a way
I
> can just directly create the flash drive the way it will ultimately be
used in the
> final system, without using this "live image" stuff?
> 
> I'd really like to be able to create the flash, mount it under Ubuntu, and
not
> see the five files the implement the live image, but see the full root
file
> system of my target.
> 
> --
> 
> Ciao,               Paul D. DeRocco
> Paul                mailto:pderocco at ix.netcom.com
> 
> 
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Paul,

I think you want to use the ext3 image not the live image (.hddimg). If you
follow the steps to install the ext 3 image on your boot drive, you will see
all the root files systems on the drive in another distro like Ubuntu .


Regards,

Sean Liming