arm内核启动时就死了，为什么？

little_horses

我的板子是lubbock, PXA255,SDRAM: 0XA0000000~0XA3FFFFFF
u-boot启动时的信息如下：
U-Boot 1.1.1 (Sep 6 2004 - 17:12:19)
U-Boot code: A3080000 -> A309C700 BSS: -> A30D0F00
RAM Configuration:
Bank #0: a0000000 64 MB
Bank #1: a4000000 0 kB
Bank #2: a8000000 0 kB
Bank #3: ac000000 0 kB
Flash: 32 MB

env_relocate[205] offset = 0x0
env_relocate[223] malloced ENV at a305c008
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 3  2  0

下载内核
$ tftp a1000000 uImage
TFTP from server 192.168.4.224; our IP address is 192.168.4.226
Filename 'uImage'.

Load address: 0xa1000000
Loading: *#################################################################
done
Bytes transferred = 838099 (cc9d3 hex)

引导内核
$ bootm a1000000
## Booting image at a1000000 ...
Image Name:
Image Type: ARM Linux Kernel Image (gzip compressed)
Data Size: 838035 Bytes = 818.4 kB
Load Address: 00040000
Entry Point: 00040000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
Starting kernel ...

然后就死机了，这是为什么啊？

在u-boot-1.1.1\include\configs\lubbock.h中
#define CONFIG_BOOTARGS "root=/dev/mtdblock2 rootfstype=cramfs console=ttyS0,115200"

在\u-boot-1.1.1\board\lubbock\config.mk中
TEXT_BASE = 0xa3080000

在u-boot-1.1.1\board\lubbock\lubbock.c中
int board_init (void)
{
DECLARE_GLOBAL_DATA_PTR;
/* memory and cpu-speed are setup before relocation */
/* so we do _nothing_ here */
/* arch number of Lubbock-Board */
gd->bd->bi_arch_number = 89;

/* adress of boot parameters */
gd->bd->bi_boot_params = 0xa0000100;
return 0;
}

对我的系统来说：
0xa0000000是内存地址；
0xa0000100是内核启动参数的起始存储位置；
0xa0008000是内核映像的起始存储位置；

疑问1：最初我 $ tftp a1000000 uImage 把内核下载到a1000000 ，这是随机选择的一个内存地址，这样不行吗？这个位置有足够的空间给它解压。我只是想测试我的内核是否能运行。

疑问2：TEXT_BASE = 0xa3080000这是我的u-boot运行后在内存的起始地址，这个地址倒是可以修改，不过，把它分配到这应该没错吧？

jackzheng2002