Problems porting to a custom PPC405GPr board using a vanilla 2.6.10 kernel

[Niklaus Giger]

Hi

I would like to port Linux to a custom PPC405GPr board. Its hardware runs 
vxWorks fine for more than a year. 

Within a few days I had a working U-boot image, which allows me to download 
via TFTP Linux-kernels.

I started with a vanilla 2.6.10 kernel, added the entries in the 
arch/ppc/platforms/4xx/Makefile and Kconfig, two file hcu3.c and hcu3.h which 
are very minimal. The board has no PCI and I do not want to add support for 
the CFI-Flashs or the onboard CAN-Chips. 
Enabling the SERIAL_TEXT_DEBUG I got the following output
## Transferring control to Linux (at address 00000000) ...
id mach(): done
MMU:enter
MMU:hw init
MMU:mapin
MMU:setio
hcu3_map_io
MMU:exit
setup_arch: enter ngng
setup_arch: bootmem
ocp: exit
arch: exit
If I attach a BDI, I get a lot of "- TARGET: target has entered debug mode" 
lines and then
DI>i
    Target state      : debug mode
    Debug entry cause : unconditional debug event
    Current PC        : 0xfffffffc
    Current CR        : 0x00000000
    Current MSR       : 0x00000000
    Current LR        : 0xc019a15c
BDI>                
The corresponding line from my System.map are
c0199e20 t free_bootmem_core
c0199ecc t __alloc_bootmem_core
c019a278 t free_all_bootmem_core
c019a4c8 T init_bootmem_node

My board has no RTC. Is this a problem? 

Should I start with another kernel? Can anybody point me to a known good 
kernel version for a specific PPC405 board?

Any hint would be greatly appreciated.

Best regards

-- 
Niklaus Giger
Wieshoschet 6
CH-8753 Mollis
Tel. ++41 55 612 20 54 (privat)
Tel. ++41 55 618 64 68 (Geschäft)