need help with kernel on QQ2440V3

[Sak1s]

These day i start to play with the old S3C2440 board QQ2440
I build u-boot from git://repo.or.cz/u-boot-openmoko/mini2440.git repo,I replaced the DM9000 network driver with the CS8900 and this way i can use tftp.

The second step was to make a new kernel from the http://repo.or.cz/w/linux-2.6/mini2440.git . I tried with tha latest git and the mini2440-stable-v2.6.31 but
i have 2 problems.The kernel seems to load but i havent the debug output from the ttySAC0,and the system restart after in a while. any help ?

Booting kernel from Legacy Image at 32000000 ...
Image Name:
Created: 2010-01-18 1:17:54 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2015212 Bytes = 1.9 MB
Load Address: cfff8000
Entry Point: 30008000
Verifying Checksum ... OK
Loading Kernel Image ...

my bootargs

bootargs=root=/dev/mtdblock3 rootfstype=jffs2 rw console=ttySAC0,115200

can anyone give me any tips ?

i have enable the

CONFIG_S3C_LOWLEVEL_UART_PORT(0)

using gcc arm-none-linux-gnueabi-4.4.1

and i use the mkimage from the u-book-openmoko repo with whose args

mkimage -A arm -O linux -T kernel -C none -a -0x30008000 -e 0x30008000 -d arch/arm/boot/zImage /tftpboot/zImage_QQ2440