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谢谢你的回复，
刚才我把kernel放在0x3000000的地方，但窜口也还是一点信息都没有，
我用make zImage做的内核zImage下载到nor flash, 在启动内核之前，我把mem_base+0x8000(0x30000000+0x8000)的数据打印出来如下：
e1a00000 e1a00000 e1a00000 e1a00000
e1a00000 e1a00000 e1a00000 e1a00000
ea000002 016f2818 00000000 0016b184
e1a07001 e1a08002 e10f2000 e3120003
1a000001 e3a00017 ef123456 e10f2000
e38220c0 e121f002 00000000 00000000
e28f00d0
和zImage的内容相同，窜口我用的参数传入(这用的是tag 的方式"console=ttySAC0,115200n8", 用param_struct时用的是" "noinitrd console=ttySAC0"") 两者都不行，我用的是ADS 1.2 开发的，由于对汇编不熟，基本上是用vivi的汇编代码．
启动的代码如下：____________________________________________________
int boot_kernel(ulong from, size_t size, int media_type)
{
int ret;
int i;
ulong boot_mem_base; /* base address of bootable memory */
ulong to;
ulong mach_type;
void (*call_linux)(int zero, int arch, unsigned long params_addr) =
(void (*)(int, int, unsigned long))(LINUX_KERNEL_BASE + LINUX_KERNEL_OFFSET);
boot_mem_base = LINUX_KERNEL_BASE;
/* copy kerne image */
to = boot_mem_base + LINUX_KERNEL_OFFSET;
DBGMSG(DEBUG, ("Copy linux kernel from 0x%08lx to 0x%08lx, size = 0x%08lx ... ",
from, to, size));
ret = copy_kernel_img(to, (char *)from, size, media_type);
if (ret)
{
DBGMSG(DEBUG, ("failed/n"));
return -1;
}
else
{
DBGMSG(DEBUG, ("done/n"));
}
if (*(ulong *)(to + 9*4) != LINUX_ZIMAGE_MAGIC)
{
DBGMSG(DEBUG, ("Warning: this binary is not compressed linux kernel image/n"));
DBGMSG(DEBUG, ("zImage magic = 0x%08lx/n", *(ulong *)(to + 9*4)));
}
else
{
DBGMSG(DEBUG, ("zImage magic = 0x%08lx/n", *(ulong *)(to + 9*4)));
}
/* Setup linux parameters and linux command line */
setup_linux_param(boot_mem_base + LINUX_PARAM_OFFSET);
/* Get machine type, see arch/arm/tools/mach-types */
mach_type = MACH_TYPE;
DBGMSG(DEBUG, ("MACH_TYPE = %d/n", mach_type));
/* Go Go Go */
DBGMSG(DEBUG, ("NOW, Booting Linux....../n"));
clean_before_call_linux();
DBGMSG(DEBUG, ("Maybe we can check some date!addr:0x%08lx /n", to));
for(i = 0; i < 100; )
{
DBGMSG(DEBUG, ("%08lx ", *(ulong *)(to + i)));
i = i + 4;
if(i%16 == 0)
{
DBGMSG(DEBUG, ("/n"));
}
}
call_linux(0, mach_type, (unsigned long)(boot_mem_base + LINUX_PARAM_OFFSET));
DBGMSG(DEBUG, ("If here, error!/n"));
return 0;
}
______________________________________________________
| Blog作者的回复:
命令行传递参数加上mem=64M。我在使用uboot的时候发现，如果不加入mem，则2.6.22的内核引导后，串口没有任何输出。 |
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