使用initrd文件系统 U-boot引导Linux方法

void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
ulong addr, ulong *len_ptr, int verify)
{
ulong initrd_start, initrd_end;
......
data = addr   sizeof (image_header_t);
len = ntohl (hdr->ih_size);
...... 
#if defined(CONFIG_B2) || defined(CONFIG_OSK_OMAP5912)
memmove ((void *) ntohl(hdr->ih_load), (uchar *)data, len);
data = ntohl(hdr->ih_load);
#endif 
...... 
if (data) {
initrd_start = data;
initrd_end = initrd_start   len;
}
......
#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
defined (CONFIG_CMDLINE_TAG) || \
defined (CONFIG_INITRD_TAG) || \
setup_start_tag (bd);
......
#ifdef CONFIG_INITRD_TAG
if (initrd_start && initrd_end)
setup_initrd_tag (bd, initrd_start, initrd_end);
#endif
......
setup_end_tag (bd);
#endif
......
theKernel (0, bd->bi_arch_number, bd->bi_boot_params);
}
#ifdef CONFIG_INITRD_TAG
static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
{
params->hdr.tag = ATAG_INITRD2;
params->hdr.size = tag_size (tag_initrd);
params->u.initrd.start = initrd_start;
params->u.initrd.size = initrd_end - initrd_start; 
params = tag_next (params);
}
#endif
#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
defined (CONFIG_CMDLINE_TAG) || \
defined (CONFIG_INITRD_TAG) || \
......
static void setup_start_tag (bd_t *bd)
{
params = (struct tag *) bd->bi_boot_params;
......
params = tag_next (params);
}
int board_init (void)
{
DECLARE_GLOBAL_DATA_PTR;

gd->bd->bi_arch_number = 234;
gd->bd->bi_boot_params = 0x10000100;
......
}