issue at the beginning of kernel booting

[Sauce.Cheng]

evolution! kernel 2.6.11 has run on the board with u-boot 1.1.4, also, at
early booting time LEDs are disabled due to MMU on and off. so i tried to
turn LEDs on after start_kernel function, wow, blinking! that is before
start_kernel will be done successfully. then i modified registers mapping in
immap_cpm2.h and configure smc1 as serial. console worked normally.
booting info as following
U-Boot 1.1.4 (Apr  2 2009 - 20:05:19)

MPC8272 Reset Status: External Soft, External Hard

MPC8272 Clock Configuration
 - Bus-to-Core Mult 4x, VCO Div 2, 60x Bus Freq  25-75 , Core Freq 100-300
 - dfbrg 1, corecnf 0x1a, busdf 3, cpmdf 1, plldf 0, pllmf 3
 - vco_out  400000000, scc_clk  100000000, brg_clk   25000000
 - cpu_clk  400000000, cpm_clk  200000000, bus_clk  100000000

Board: Motorola MPC8272ADS
DRAM:  32 MB
FLASH: 512 kB
In:    serial
Out:   serial
Err:   serial
Net:   FCC1 ETHERNET
Hit any key to stop autoboot:  0 
Using FCC1 ETHERNET device
TFTP from server 192.168.0.99; our IP address is 192.168.0.100
Filename 'uImage'.
Load address: 0x400000
Loading: #################################################################
	 #################################################################
	 #######################
done
Bytes transferred = 781091 (beb23 hex)
=> bootm

## Booting image at 00400000 ...
   Image Name:   Linux-2.6.11
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    781027 Bytes = 762.7 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
OK
Linux version 2.6.11 (root at localhost.localdomain) (gcc version 4.0.0 (DENX
ELDK 4.0 4.0.0)) #49 Tue Apr 7 04:11:56 EDT 2009

Motorola PQ2 ADS PowerPC port

Built 1 zonelists

Kernel command line: mem=32M console=ttyCPM0,9600 root=/dev/mtdblock0 rw
rootfstype=jffs2

PID hash table entries: 256 (order: 8, 4096 bytes)

Warning: real time clock seems stuck!

Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)

Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)

Memory: 30728k available (1304k kernel code, 276k data, 104k init, 0k
highmem)

Mount-cache hash table entries: 512 (order: 0, 4096 bytes)

Chengmo : Here will enter rest_init()!

NET: Registered protocol family 16

PCI: Probing PCI hardware

Generic RTC Driver v1.07

Serial: CPM driver $Revision: 0.01 $

ttyCPM0 at MMIO 0xf0011a80 (irq = 4) is a CPM UART

io scheduler noop registered

io scheduler anticipatory registered

io scheduler deadline registered

io scheduler cfq registered

RAMDISK driver initialized: 16 RAM disks of 32768K size 1024 blocksize

loop: loaded (max 8 devices)

halt here~
i have tried to build newer kernel and bootloader. but LEDs were not
blinking at start_kernel, i guessed something wrong with dts, i should check
OF doc and dts. 
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