[OE-core] [PATCH 1/2] image_types.bbclass: implement jffs2 summary images (sum.jffs2)

[Richard Purdie]

On Thu, 2011-12-08 at 23:43 +0100, Ulf Samuelsson wrote:
> Not sure exactly what sumtools does,
> but as I understood it, it does things which
> the targets need to be doing at first startup otherwise.
> 
> Does that not mean that the target rootfs will grow
> from 44 MB to 57 MB during that process?
> 
> If it does, you never want to have the non-sumtool version.
> (I guess if you downloaded the file over a 20 bps channel to
> a nuclear submarine, you would disagree)

It doesn't. It will compute all this data into memory at each boot
increasing boot time but it won't write it back to the flash.

The sum images just mean the data can be directly loaded without
computation and reading a lot more of the flash.

Cheers,

Richard