RPi hangs in bootloader

[Werner Thie]

Hi all

just built a fresh image (latest sources) with Tim Kientzle's script for 
the RPi after getting my serial cable and see the following on the console

 > cu -l /dev/cuaU0 -s 115200

Connected
  0
reading uEnv.txt
170 bytes read in 9448 ms (0 Bytes/s)
Importing environment from mmc ...
reading ubldr
242830 bytes read in 62811 ms (2.9 KiB/s)
## Starting application at 0x02000054 ...
Consoles: U-Boot console
Compatible API signature found @db662a8
Number of U-Boot devices: 1

FreeBSD/armv6 U-Boot loader, Revision 1.2
(root at xtools, Mon Feb 18 08:36:09 CET 2013)
DRAM:	 224MB

Device: disk
error validating blob: FDT_ERR_BADMAGIC
|
/boot/kernel/kernel data=0x3939b8+0x4294c syms=[0x4+0x7f530+0x4+0x61597]
Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
fdt_start: 0x00466F50
Kernel entry at 0x100100...
Kernel args: (null)

After that the RPi hangs forever. Any hints what to try?

I do not understand the FDT_ERR_BADMAGIC, the page 
http://www.denx.de/wiki/DULG/UBootCmdFDT has a lot of those errors 
listed in an example session but does not explain what the message conveys?

TIA, Werner