[meta-ti] Creating am335x sdcard images with wic

[Maciej Borzecki]

On Thursday 18 of September 2014 15:33:55 Alexandre Belloni wrote:
> Hi,
> 
> I tried multiple ways of create sd card images for my am335x based
> platform.
> 
> I tried to revive the sdimg image type, using the last patch from
> Otavio [1]
> 
> This didn't generate bootable images.
> 
> Now, I'm trying to use wic, based on this patch from Maciej [2].
> I have multiple issue, the first one is making wic load the plugin. I
> have to apply the patch on poky rather than on my own layer to get wic
> to load that plugin, is that intended ?
> 
> Next, I'm still not able to generate a bootable image. I tracked it down
> to an issue with the fat filesystem rather than the partitionning
> itself.
> 
> 1/ With wic, this is the command line to generate the FAT
> filesystem:
> 
> mkdosfs -F 16 -n boot -d /var/tmp/wic/build/boot -C /var/tmp/wic/build/boot
> 10240

With current master this line should look more like this:
mkdosfs -F 16 -n boot -d /var/tmp/wic/build/boot -C 
/var/tmp/wic/build/fs_boot.vfat 10240

What revision of poky do you use?

> 
> This results in an image that doesn't boot.
> 
> 
> 2/ On the same SD card, if I use:
> 
> mkdosfs -F 16 -n boot -d /var/tmp/wic/build/boot /dev/mmcblk0p1
> 
> This results in an SD card that can boot, the MLO starts, loads and
> starts u-boot.img but then it fails to load my dtb from the FAT
> filesystem because somehow, it only has short names.
> 
> 
> 3/ On the same SD card, if I manually format and copy files
> mkfs.vfat -F 16 /dev/mmcblk0p1 -n boot
> mount /dev/mmcblk0p1 /mnt
> cp $BUILDDIR/tmp/deploy/images/beaglebone/{MLO,u-boot.img,zImage} /mnt
> cp $BUILDDIR/tmp/deploy/images/beaglebone/*.dtb /mnt
> umount /dev/mmcblk0p1
> 
> This one just boots fine, with long names.
> 
> Any insight?
> 
> [1]
> https://lists.yoctoproject.org/pipermail/meta-ti/2011-December/000234.html
> [2] https://lists.yoctoproject.org/pipermail/meta-ti/2014-July/004901.html

-- 

Maciej Borzęcki 
Senior Software Engineer Open-RnD Sp. z o.o. 
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