Re: [gentoo-user] Creating an firmware image from a too large microSDcard...?

Bill Kenworthy <billk@×××××××××.au> [16-01-16 11:04]:
> On 16/01/16 17:27, Neil Bothwick wrote:
> > On Sat, 16 Jan 2016 04:50:49 +0100, Meino.Cramer@×××.de wrote:
> >
> >> to post a firmware image of my embedded linux computer
> >> to a friend I want to size it down.
> >>
> >> System wise I did that already (only the really necessary
> >> stuff of Gentoo plus some configuration and addons related
> >> to the embedded system)...the problem comes with the size of
> >> the microSDcard I use: 32 GB....
> >>
> >> The microSDcard (source) has two partitions (boot + the rest).
> >> The boot partition is the first partition and it is of a fixed
> >> and tiny size. The second partition contains the "rest": Gentoo.
> >> Currently the used space of this partition is also small.
> >>
> >> The image needs to be of a format, which makes
> >> it possble to 'dd' it onto a microSDcard (target) and afterwards use
> >> g/parted to resize/expand the second partition to the end
> >> of the microSDcard to get all storage space available.
> >
> > Quick and kludgy. Partition an SD card of the correct size, rsync your
> > data to it, then dd that card.
> >
> > Any other method you use will require you to have a smaller SD card to
> > test the resultant image, so you may as well use that as the source and
> > know it works.
> >
> >
>
> It is possible to create a dd image of the whole SD card and mount it in
> a loopback to repartition etc.
>
> Mount it then shrink your existing file system (and probably the
> partition too) to less than the required size, then recreate the dd
> image to a size still less than the new sd card.
>
> On the new card, dd it across until it errors off, then fix/expand the
> partition and then the file system.  You dont care if the end is missing
> as long as your data is within the size needed.
>
> BillK
>
>
>
Hi Neil, hi Bill,

THANKS FOR THE EXPLANATIONS! :)

Will try that!

Best regards,
Meino