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    printk(KERN_NOTICE);
    printk(linux_banner);
    setup_arch(&command_line);
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ÖÐÒѾ­Ê¹Óã¬tagÁбíÊÇÔÚº¯Êýsetup_archÖе÷Óõġ£setup_archº¯ÊýÊÇÔÚarch/arm/kernel/setup.cÖж¨Ò壺
void __init setup_arch(char **cmdline_p)
{
 ....
    setup_processor(); // ´¦ÀíÆ÷Ïà¹ØµÄÉèÖÃ
    mdesc = setup_machine(machine_arch_type);  // µÃµ½machine_desc½á¹¹
    machine_name = mdesc->name;
...
    if (mdesc->boot_params) // ¶¨ÒåÁËubootµÄ²ÎÊý
        tags = phys_to_virt(mdesc->boot_params); // µÃµ½uboot²ÎÊýtagµØÖ·
...
    if (tags->hdr.tag == ATAG_CORE) {
        if (meminfo.nr_banks != 0) // ÔÚÄÚºËÖж¨ÒåÁËmeminfo
            squash_mem_tags(tags); // ºöÂÔÄÚ´æÖеÄÐÅÏ¢
        parse_tags(tags); // ½âÎötag
    }
...
    memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
    boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
    parse_cmdline(cmdline_p, from); // ½âÎöÃüÁîÐÐ
    paging_init(&meminfo, mdesc); // ÖØÐ³õʼ»¯Ò³±í
    request_standard_resources(&meminfo, mdesc);
...
}
ÉÏÃæº¯ÊýµÄÒÉÎÊÊÇif (mdesc->boot_params) // ¶¨ÒåÁËubootµÄ²ÎÊý£¬ubootµÄ²ÎÊýÊÇÔÚÄÇÀﶨÒåµÄ£¿´ð°¸¾ÍÊÇÔÚarch/arm/
mach-s3c2410/mach-smdk2410.cÖж¨Ò壺
MACHINE_START(SMDK2410, "SMDK2410") /* @TODO: request a new identifier and switch
...
    .boot_params    = S3C2410_SDRAM_PA + 0x100,
MACHINE_END
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