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

[J. Roeleveld]

On 16 January 2016 04:50:49 CET, Meino.Cramer@×××.de wrote:
>Hi,
>
>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.
>
>If I dd the source into an image I get all those zeroes also and
>the image only will fit onto a microSDcard (target) of at least
>the same size.
>
>If I dd each partition separately I get two files and the partition
>table is not copied...may be technically possible but not user
>friendly.
>
>How can I manage to get an image from my microSDcard (source), which
>only consists of the used space in a way that it can be put onto
>another microSDcard (target) in the waay described above?
>
>How can I acchieve that magic ?  ;) :)
>
>Thank you very much in advance for any help!
>Best regards,
>Meino

I would create a script that partitions and formats the sdcard.
Then untar the contents of the partitions
Then set up the bootloader.

This should lead to a small size which is also user friendly.

--
Joost 
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.