bootm.c

uboot详细解读可用启动引导LINUX2.6内核

static int fit_check_fdt (const void *fit, int fdt_noffset, int verify)
{
	fit_image_print (fit, fdt_noffset, "   ");

	if (verify) {
		puts ("   Verifying Hash Integrity ... ");
		if (!fit_image_check_hashes (fit, fdt_noffset)) {
			fdt_error ("Bad Data Hash");
			return 0;
		}
		puts ("OK\n");
	}

	if (!fit_image_check_type (fit, fdt_noffset, IH_TYPE_FLATDT)) {
		fdt_error ("Not a FDT image");
		return 0;
	}

	if (!fit_image_check_comp (fit, fdt_noffset, IH_COMP_NONE)) {
		fdt_error ("FDT image is compressed");
		return 0;
	}

	return 1;
}
#endif /* CONFIG_FIT */

static int boot_get_fdt (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		bootm_headers_t *images, char **of_flat_tree, ulong *of_size)
{
	ulong		fdt_addr;
	image_header_t	*fdt_hdr;
	char		*fdt_blob = NULL;
	ulong		image_start, image_end;
	ulong		load_start, load_end;
#if defined(CONFIG_FIT)
	void		*fit_hdr;
	const char	*fit_uname_config = NULL;
	const char	*fit_uname_fdt = NULL;
	ulong		default_addr;
	int		cfg_noffset;
	int		fdt_noffset;
	const void	*data;
	size_t		size;
#endif

	*of_flat_tree = NULL;
	*of_size = 0;

	if (argc > 3 || genimg_has_config (images)) {
#if defined(CONFIG_FIT)
		if (argc > 3) {
			/*
			 * If the FDT blob comes from the FIT image and the
			 * FIT image address is omitted in the command line
			 * argument, try to use ramdisk or os FIT image
			 * address or default load address.
			 */
			if (images->fit_uname_rd)
				default_addr = (ulong)images->fit_hdr_rd;
			else if (images->fit_uname_os)
				default_addr = (ulong)images->fit_hdr_os;
			else
				default_addr = load_addr;

			if (fit_parse_conf (argv[3], default_addr,
						&fdt_addr, &fit_uname_config)) {
				debug ("*  fdt: config '%s' from image at 0x%08lx\n",
						fit_uname_config, fdt_addr);
			} else if (fit_parse_subimage (argv[3], default_addr,
						&fdt_addr, &fit_uname_fdt)) {
				debug ("*  fdt: subimage '%s' from image at 0x%08lx\n",
						fit_uname_fdt, fdt_addr);
			} else
#endif
			{
				fdt_addr = simple_strtoul(argv[3], NULL, 16);
				debug ("*  fdt: cmdline image address = 0x%08lx\n",
						fdt_addr);
			}
#if defined(CONFIG_FIT)
		} else {
			/* use FIT configuration provided in first bootm
			 * command argument
			 */
			fdt_addr = (ulong)images->fit_hdr_os;
			fit_uname_config = images->fit_uname_cfg;
			debug ("*  fdt: using config '%s' from image at 0x%08lx\n",
					fit_uname_config, fdt_addr);

			/*
			 * Check whether configuration has FDT blob defined,
			 * if not quit silently.
			 */
			fit_hdr = (void *)fdt_addr;
			cfg_noffset = fit_conf_get_node (fit_hdr,
					fit_uname_config);
			if (cfg_noffset < 0) {
				debug ("*  fdt: no such config\n");
				return 0;
			}

			fdt_noffset = fit_conf_get_fdt_node (fit_hdr,
					cfg_noffset);
			if (fdt_noffset < 0) {
				debug ("*  fdt: no fdt in config\n");
				return 0;
			}
		}
#endif

		debug ("## Checking for 'FDT'/'FDT Image' at %08lx\n",
				fdt_addr);

		/* copy from dataflash if needed */
		fdt_addr = genimg_get_image (fdt_addr);

		/*
		 * Check if there is an FDT image at the
		 * address provided in the second bootm argument
		 * check image type, for FIT images get a FIT node.
		 */
		switch (genimg_get_format ((void *)fdt_addr)) {
		case IMAGE_FORMAT_LEGACY:
			/* verify fdt_addr points to a valid image header */
			printf ("## Flattened Device Tree from Legacy Image at %08lx\n",
					fdt_addr);
			fdt_hdr = image_get_fdt (fdt_addr);
			if (!fdt_hdr)
				goto error;

			/*
			 * move image data to the load address,
			 * make sure we don't overwrite initial image
			 */
			image_start = (ulong)fdt_hdr;
			image_end = image_get_image_end (fdt_hdr);

			load_start = image_get_load (fdt_hdr);
			load_end = load_start + image_get_data_size (fdt_hdr);

			if ((load_start < image_end) && (load_end > image_start)) {
				fdt_error ("fdt overwritten");
				goto error;
			}

			debug ("   Loading FDT from 0x%08lx to 0x%08lx\n",
					image_get_data (fdt_hdr), load_start);

			memmove ((void *)load_start,
					(void *)image_get_data (fdt_hdr),
					image_get_data_size (fdt_hdr));

			fdt_blob = (char *)load_start;
			break;
		case IMAGE_FORMAT_FIT:
			/*
			 * This case will catch both: new uImage format
			 * (libfdt based) and raw FDT blob (also libfdt
			 * based).
			 */
#if defined(CONFIG_FIT)
			/* check FDT blob vs FIT blob */
			if (fit_check_format ((const void *)fdt_addr)) {
				/*
				 * FIT image
				 */
				fit_hdr = (void *)fdt_addr;
				printf ("## Flattened Device Tree from FIT Image at %08lx\n",
						fdt_addr);

				if (!fit_uname_fdt) {
					/*
					 * no FDT blob image node unit name,
					 * try to get config node first. If
					 * config unit node name is NULL
					 * fit_conf_get_node() will try to
					 * find default config node
					 */
					cfg_noffset = fit_conf_get_node (fit_hdr,
							fit_uname_config);

					if (cfg_noffset < 0) {
						fdt_error ("Could not find configuration node\n");
						goto error;
					}

					fit_uname_config = fdt_get_name (fit_hdr,
							cfg_noffset, NULL);
					printf ("   Using '%s' configuration\n",
							fit_uname_config);

					fdt_noffset = fit_conf_get_fdt_node (fit_hdr,
							cfg_noffset);
					fit_uname_fdt = fit_get_name (fit_hdr,
							fdt_noffset, NULL);
				} else {
					/* get FDT component image node offset */
					fdt_noffset = fit_image_get_node (fit_hdr,
							fit_uname_fdt);
				}
				if (fdt_noffset < 0) {
					fdt_error ("Could not find subimage node\n");
					goto error;
				}

				printf ("   Trying '%s' FDT blob subimage\n",
						fit_uname_fdt);

				if (!fit_check_fdt (fit_hdr, fdt_noffset,
							images->verify))
					goto error;

				/* get ramdisk image data address and length */
				if (fit_image_get_data (fit_hdr, fdt_noffset,
							&data, &size)) {
					fdt_error ("Could not find FDT subimage data");
					goto error;
				}

				/* verift that image data is a proper FDT blob */
				if (fdt_check_header ((char *)data) != 0) {
					fdt_error ("Subimage data is not a FTD");
					goto error;
				}

				/*
				 * move image data to the load address,
				 * make sure we don't overwrite initial image
				 */
				image_start = (ulong)fit_hdr;
				image_end = fit_get_end (fit_hdr);

				if (fit_image_get_load (fit_hdr, fdt_noffset,
							&load_start) == 0) {
					load_end = load_start + size;

					if ((load_start < image_end) &&
							(load_end > image_start)) {
						fdt_error ("FDT overwritten");
						goto error;
					}

					printf ("   Loading FDT from 0x%08lx to 0x%08lx\n",
							(ulong)data, load_start);

					memmove ((void *)load_start,
							(void *)data, size);

					fdt_blob = (char *)load_start;
				} else {
					fdt_blob = (char *)data;
				}

				images->fit_hdr_fdt = fit_hdr;
				images->fit_uname_fdt = fit_uname_fdt;
				images->fit_noffset_fdt = fdt_noffset;
				break;
			} else
#endif
			{
				/*
				 * FDT blob
				 */
				fdt_blob = (char *)fdt_addr;
				debug ("*  fdt: raw FDT blob\n");
				printf ("## Flattened Device Tree blob at %08lx\n", (long)fdt_blob);
			}
			break;
		default:
			fdt_error ("Did not find a cmdline Flattened Device Tree");
			goto error;
		}

		printf ("   Booting using the fdt blob at 0x%x\n", (int)fdt_blob);

	} else if (images->legacy_hdr_valid &&
			image_check_type (&images->legacy_hdr_os_copy, IH_TYPE_MULTI)) {

		ulong fdt_data, fdt_len;

		/*
		 * Now check if we have a legacy multi-component image,
		 * get second entry data start address and len.
		 */
		printf ("## Flattened Device Tree from multi "
			"component Image at %08lX\n",
			(ulong)images->legacy_hdr_os);

		image_multi_getimg (images->legacy_hdr_os, 2, &fdt_data, &fdt_len);
		if (fdt_len) {

			fdt_blob = (char *)fdt_data;
			printf ("   Booting using the fdt at 0x%x\n", (int)fdt_blob);

			if (fdt_check_header (fdt_blob) != 0) {
				fdt_error ("image is not a fdt");
				goto error;
			}

			if (be32_to_cpu (fdt_totalsize (fdt_blob)) != fdt_len) {
				fdt_error ("fdt size != image size");
				goto error;
			}
		} else {
			debug ("## No Flattened Device Tree\n");
			return 0;
		}
	} else {
		debug ("## No Flattened Device Tree\n");
		return 0;
	}

	*of_flat_tree = fdt_blob;
	*of_size = be32_to_cpu (fdt_totalsize (fdt_blob));
	debug ("   of_flat_tree at 0x%08lx size 0x%08lx\n",
			*of_flat_tree, *of_size);

	return 0;

error:
	do_reset (cmdtp, flag, argc, argv);
	return 1;
}

static int boot_relocate_fdt (struct lmb *lmb, ulong bootmap_base,
		cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		char **of_flat_tree, ulong *of_size)
{
	char	*fdt_blob = *of_flat_tree;
	ulong	relocate = 0;
	ulong	of_len = 0;

	/* nothing to do */
	if (*of_size == 0)
		return 0;

	if (fdt_check_header (fdt_blob) != 0) {
		fdt_error ("image is not a fdt");
		goto error;
	}

#ifndef CFG_NO_FLASH
	/* move the blob if it is in flash (set relocate) */
	if (addr2info ((ulong)fdt_blob) != NULL)
		relocate = 1;
#endif

	/*
	 * The blob needs to be inside the boot mapping.
	 */
	if (fdt_blob < (char *)bootmap_base)
		relocate = 1;

	if ((fdt_blob + *of_size + CFG_FDT_PAD) >=
			((char *)CFG_BOOTMAPSZ + bootmap_base))
		relocate = 1;

	/* move flattend device tree if needed */
	if (relocate) {
		int err;
		ulong of_start = 0;

		/* position on a 4K boundary before the alloc_current */
		/* Pad the FDT by a specified amount */
		of_len = *of_size + CFG_FDT_PAD;
		of_start = (unsigned long)lmb_alloc_base(lmb, of_len, 0x1000,
				(CFG_BOOTMAPSZ + bootmap_base));

		if (of_start == 0) {
			puts("device tree - allocation error\n");
			goto error;
		}

		debug ("## device tree at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
			(ulong)fdt_blob, (ulong)fdt_blob + *of_size - 1,
			of_len, of_len);

		printf ("   Loading Device Tree to %08lx, end %08lx ... ",
			of_start, of_start + of_len - 1);

		err = fdt_open_into (fdt_blob, (void *)of_start, of_len);
		if (err != 0) {
			fdt_error ("fdt move failed");
			goto error;
		}
		puts ("OK\n");

		*of_flat_tree = (char *)of_start;
		*of_size = of_len;
	} else {
		*of_flat_tree = fdt_blob;
		of_len = (CFG_BOOTMAPSZ + bootmap_base) - (ulong)fdt_blob;
		lmb_reserve(lmb, (ulong)fdt_blob, of_len);
		fdt_set_totalsize(*of_flat_tree, of_len);

		*of_size = of_len;
	}

	return 0;

error:
	return 1;
}
#endif