分类： LINUX
2009-08-19 20:42:44
1. 修改、vivi/arch/s3c2410/smdk.c 添加file分区
mtd_partition_t default_mtd_partitions[] = { {name: "vivi",
offset: 0,
size: 0x00020000,
flag: 0
}, {name: "param",
offset: 0x00020000,
size: 0x00010000,
flag: 0
}, {name: "kernel",
offset: 0x00030000,
size: 0x000f0000,
flag: 0
}, {name: "root",
offset: 0x00120000,
size: 0x00940000,
flag: MF_BONFS
},{name: "file",
offset: 0x00a60000,
size: 0x00440000,
flag: 0
}
};
2. vivi/lib/command.c中添加命令 eg.添加file_cmd
extern user_command_t file_cmd;
add_command(&file_cmd);//file_cmd是个结构体可以仿照boot_cmd写
3. vivi/lib/boot_kernel.c中实现命令
user_command_t file_cmd = {"file",
file_boot,//file_boot函数获取file分区的起始地址和分区大小
NULL,
"file[{cmds}] \t\t\t-- Booting file"};
///////////////////////////////////////////////////
void file_boot(int argc,const char **argv)
{ulong from = 0;
size_t size = 0;
mtd_partition_t *file_part;
switch (argc) {case 1:
file_part = get_mtd_partition("file");//返回的结构提供了file的起始地址和该分区大小
if(file_part == NULL){ printk("Can't find default 'file' partition\n");return;
}
from = file_part->offset;
size = file_part->size;
//读取起始地址和分区大小
break;
default:
display_help();
break;
}
boot_file(from, size);
}
//////////////////////////////////////////////////////////////
void go(unsigned long addr, long a0, long a1, long a2, long a3);
int boot_file(ulong from, size_t size)
{int ret;
ulong boot_mem_base;
ulong to;
to = 0x30000000;
printk("Copy linux file from 0x%08lx to 0x%08lx, \size = 0x%08lx ... ",from, to, size);
ret = nand_read_ll((unsigned char *)to,
(unsigned long)from, (int)size);
//将代码考到ram中0x30000000地址处
if (ret) { printk("failed\n");return -1;
} else { printk("done\n");}
go(to,0,0,0,0);//跳到ram中0x30000000地址处执行代码
return 0;
}