Thank you for your quick answer.
I am trying to boot Linux 2.4.25 (code from denx linux-2-4-devel) The board is similar to MPC8260ADS
Arghh... A description like this is absolutley useless, and misleading. Your probably even fooling yourself. Similar? In that it uses the same processor? Or is everything IDENTICAL?
If it was not IDENTICAL I would not have mentioned this board.
What happens is that the kernel is starting but after a short while gets an exception and the board is reset again.
Please define "after a short while". Do you see any boot messages on the console? Do you see any messages when you do a post mortem dump of the log_buf memory? [See http://www.denx.de/twiki/bin/view/DULG/LinuxPostMortemAnalysis]
I do not see any boot messages, I can't exactly define how long it takes until the reset but it is a very short time that during this time I expected at least one line saying this is the kernel.
We tried looking at the kernel sources to see where we get, we did this by lighting hardware LEDS we have on the board.
I see. Please remove ALL this code and try again. perhaps it is just your debugging code which crashes the system. [This has been discussed before, both here and in the linuxppc mailing lists. Search the archives.]
I tried removing all my code and tried again, that was the first thing I thought that maybe I crash the system. I tried again and again and the problem was the same.
We tried to find where in the kernel we get the exception, we could not find exactly where it happens, but we did find that it happens somewhere in the function prom_init called from early_init inside arch/ppc/kernel/setup.c
Does anyone have any idea what we should look next?
OK, I'll give you two hints:
get yourself a BDI2000. You will need it.
Check your memory map, and the init sequence of your SDRAM [no,
I'm not going to explain this here again. Search the archives.]
Unfortunatly the archives are not searchable, otherwise that would be the first thing I would do, could you give me some hints on what do you mean init sequence of SDRAM? As for the memory map, I made sure I have RAM starting from 0x0000, I have 128Mb of RAM. The IMMR is set to 0xF0000000.
-- Ori Idan