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初始化linux内核镜像结构

static int bootm_start(cmd_tbl_t *cmdtp, int flag, int argc,		       char * const argv[]){	memset((void *)&images, 0, sizeof(images));	images.verify = env_get_yesno("verify");	boot_start_lmb(&images);	bootstage_mark_name(BOOTSTAGE_ID_BOOTM_START, "bootm_start");	images.state = BOOTM_STATE_START;	return 0;}

读取内核镜像头部，获取os和initrd基地址和大小

static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc,			 char * const argv[]){	/* get kernel image header, start address and length */	os_hdr = boot_get_kernel(cmdtp, flag, argc, argv,			&images, &images.os.image_start, &images.os.image_len);				}

修正上一步获取的initrd基地址

int boot_ramdisk_high(struct lmb *lmb, ulong rd_data, ulong rd_len,		  ulong *initrd_start, ulong *initrd_end){	*initrd_start = (ulong)lmb_alloc_base(lmb, rd_len, 0x1000, initrd_high);		//挪到新的地址	memmove_wd((void *)*initrd_start, (void *)rd_data, rd_len, CHUNKSZ);	return 0;}

将initrd地址保存在设备树，将来用于内核解析

int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end){		err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",			      (uint64_t)initrd_start, is_u64);	err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",			      (uint64_t)initrd_end, is_u64);}

ramdisk与 initrd、initramfs的关系