[oe] Adding sumtool to a JFFS2 build to speed up first boot

[Khem Raj]

On Sat, Oct 29, 2011 at 2:27 PM, Andrea Adami <andrea.adami at gmail.com> wrote:
> On Sat, Oct 29, 2011 at 7:14 PM, Tom Rini <tom.rini at gmail.com> wrote:
>
>> On Sat, Oct 29, 2011 at 9:27 AM, Ulf Samuelsson
>> <ulf_samuelsson at telia.com> wrote:
>> > Trying to solve another problem I came up with
>> > changing IMAGE_CMD_jffs2 defined in conf/bitbake.conf
>> > by redefining it in conf/local.conf.
>> >
>> > During that process I noticed the "sumtool" utility
>> > which works on the jffs2 image, doing some
>> > bookkeeping which then does not have to be
>> > done on the target.
>> >
>> > I unserstand, this can speed up loading significantly.
>> > Any reason not using this in OE?
>>
>> Last time I looked at this, the reason was that you had to re-jigger
>> the IMAGE_CMD a bit and you also have to take care as not all of the
>> options are the same between mkfs.jffs2 and sumtool.  At least the
>> first part might be easier with oe-core and the reworked image class.
>> The latter part is just annoying.
>>
>> --
>> Tom
>>
>> FWIW we are defining our jffs2-summary in
> http://cgit.openembedded.org/meta-handheld/tree/conf/machine/include/zaurus.inc
>
> This works beautifully in oe-dev but not using oe-core for it sets
> IMAGE_CMD_jffs2 = and this can  not be overriden
> We would just need a weak assignment in image_types.bbclass or maybe a new
> image type like IMAGE_CMD_jffs2-summary and related commands.
>

I would say port patches to oe-core for it.

> Regards
>
> Andrea
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