[yocto] raspberrypi image questions

[Paul Eggleton]

On Wednesday 05 September 2012 12:16:44 Gary Thomas wrote:
> I just built Yocto/Poky for the raspberrypi, following the
> recent thread on this list.  I noticed that the resulting SD
> image is ~4GB, but most of that space seems to be unused:
> 
>    $ ssh root at 192.168.1.150
>    Warning: Permanently added '192.168.1.150' (RSA) to the list of known
> hosts. root at 192.168.1.150's password:
>    root at raspberrypi:~# df
>    Filesystem           1K-blocks      Used Available Use% Mounted on
>    /dev/root                57388     46754      7718  86% /
>    none                     93964       156     93808   0% /dev
>    /dev/mmcblk0p2           57388     46754      7718  86% /media/mmcblk0p2
>    /dev/mmcblk0p1           19400      8928     10472  46% /media/mmcblk0p1
>    tmpfs                    93964        56     93908   0% /var/volatile
>    tmpfs                    93964         0     93964   0% /dev/shm
>    tmpfs                    93964         0     93964   0% /media/ram
>    root at raspberrypi:~# cat /proc/partitions
>    major minor  #blocks  name
> 
>     179        0    3977216 mmcblk0
>     179        1      19456 mmcblk0p1
>     179        2    3885056 mmcblk0p2
> 
> Notice that the physical partition for /dev/mmcblk0p2 is huge but
> the file system is only 57MB.
> 
> How can I adjust my build and/or resize the file system to actually
> use the rest of the SD card?

I suspect a resize2fs call is needed in there. Since the SD card class in 
meta-raspberrypi was changed to use the actual ext2 rootfs image instead of 
creating a new one on the fly, this has become an issue. I would suggest filing 
the issue on the meta-raspberrypi github.

> Also, is it possible to just build the SD image much like I do for
> other devices like the BeagleBoard, albeit with different contents
> in /boot?  Sloshing around 4GB images is rather painful, plus it
> takes forever to DD it to the SD card.

I must be missing something - do you want the rootfs larger or don't you? If 
it's expanded it will take up 4GB minus the boot partition size so you're into 
a large dd again... 

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre