Thanks Pali.
i updated the package u-boot-tools from extras-devel.

I see also the updated package u-boot-flasher but i can't install it, it says unmet dependencies:
kernel-modules (=2.6.28-20103103+0m5)


I have 3 kernels which i use: 2.6.28.10-cssu3, 2.6.28-omap1, 2.6.28-omap1-fb
in /lib/modules i have installed modules for:
/2.6.28-omap1
/2.6.28.10-cssu3

Did i need the package u-boot-flasher ? (u-boot is aledy installed in NAND and 2.6.28-cssu3 is the default boot entry)

In the future i want toboot other OSes from the MicroSD-Card, which is ext3-formatted.

Thank you....