bootm 0x100000 0x240000 (其中:0x100000是linux内核在Flash中的地址,0x240000是initrd在flash中的地址) setenv bootargs console=ttyS0,115200n8 root=/dev/ram rw mem=32M 当u-boot使用上面的设置时,能够正常引导linux加载initrd ! 注意: u-boot和linux内核之间是通过ATAG-TAG方式来传递启动参数的。u-boot根据下面的命令: bootm 0x100000 0x240000 通过调用setup_initrd_tag()在 params = (struct tag *) bd->bi_boot_params内存相应位置建立initd的TAG表项,向linux传递了关于initrd的内核参数,因此,不用在bootargs中再次指定initrd的相关参数了! 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 = http://www.knowsky.com/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_TAGif (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_TAGstatic 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;......} |