My problem is: I cannot use compressed rootfs (the kernel crashes during boot) but uncompressed ones work fine.
What I did: I'm using Buildroot 2013.11 to generate Images for my embedded Linux (2.6.39) ARM 9 system, booting from SD card.
I'm "dd"ing the Images (e.g. ext4) to the 2nd partition of the SD card with
sudo dd if=/path-to/rootfs.ext4 of=/dev/sdb2 bs=2048
and enable the driver in linux-menuconfig, that is
File systems - <*> The Extended 4 (ext4) filesystem - [*] Use ext4 for ext2/ext3 file systems - [*] Ext4 extended attributes
Now when I like to use the compressed ext4 (e.g. with lzo), buildroot generates an
rootfs.ext4.lzo when "dd"ing here with
sudo dd if=/path-to/rootfs.ext4.lzo of=/dev/sdb2 bs=2048
the command is executed without any error but from this point "sdb2" isn't accessible anymore until it is formated again. When using this SD to boot the system the kernel crashes telling me it was trying to interpret the partition with ext4 but he wasn't able to read it.
Where am I going wrong?