How to port a PowerPC-Based Kernel

Linux general technology-Linux programming and kernel information, which is a strange problem of PowerPC kernel transplantation, is described below. How to port a PowerPC-Based Kernel

My system is based on mpc3167, the kernel is using a linux-2.6.10, u-boot version is 1.1.5,
Use tftp to download the uImage to the target board. After decompression, the serial port is not printed. The following content is displayed:

=> Bootm 0x400000
Using fpc3 ETHERNET device
TFTP from server 192.168.0.48; our IP address is 192.168.0.49
Filename 'uimage '.
Load address: 0x400000
Loading: *####################################### ##########################
###################################
Done
Bytes transferred = 511300 (hex)
# Booting image at 00400000...
Image Name: Linux-2.6.10
Image Type: PowerPC Linux Kernel Image (gzip compressed)
Data Size: 511236 Bytes = 499.3 kB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum... OK
Uncompressing Kernel Image... OK

Then there will be no changes. With the method of lighting to head. s, the light can be on before bl call_setup_cpu (line 189 attachment), but then the light will cause the machine to restart. My lighting code is as follows:

Void led ()
{
* (Unsigned int *) (IMMR_ADDR + 0x10d10) & = ~ (0x003c0000 & (3 <18 ));
Return;
}
IMMR_ADDR is 0xf0000000

SCC1 is used to print the serial port. Can you solve this problem?
Which codes need to be modified to print with SCC1? How can I use the light to continue tracking?

I have been depressed for more than a week. Hope you can help me!