help reqd for mpc8260 linux

Hi All,
I working on custom board(mpc8260) . Now the bootlader is working and when 
i dowload the kernel image through u-boot it gives messages as
"Transferring Conrol to Linux" and then nothing comes. I am using 
Linux-2.4.25 and eldk toolkit ,both from denx.
My boards memory map is SDRAM starts from  0 and flash starts from 
0x30000000. and baudrate is 57600
When i was debugging in
start_here(arch/ppc/kernel/head.S)
It is passing the machine_init and  MMU_init(This i have seen by putting 
printk and seeing it in log_buf) and then in this code 


lis     r4,2f@h
        ori     r4,r4,2f@l
        tophys(r4,r4)
        li      r3,MSR_KERNEL & ~(MSR_IR|MSR_DR)
        FIX_SRR1(r3,r5)
        mtspr   SRR0,r4
        mtspr   SRR1,r3
        SYNC
        bl      MMU_init_prabha //(This is just a printk function).Till 
here its working.

        RFI
If i put the printk after this funtion i am not getting anything in the 
log_buf. I simply commented the RFI instruction then also i didn't see any 
messages.
Can anybody tell me what may be the problem.
Waiting for reply.
Thanks in advance.
Best Regards

Prabha J.
Tata Consultancy Services Limited
Mailto: prabha.j@tcs.com
Website: http://www.tcs.com

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