auto_update.c

嵌入式试验箱S3C2410的bootloader源代码

au_do_update(int idx, long sz)
{
	image_header_t *hdr;
	char *addr;
	long start, end;
	int off, rc;
	uint nbytes;

	hdr = (image_header_t *)LOAD_ADDR;

	/* disable the power switch */
	*CPLD_VFD_BK |= POWER_OFF;

	/* execute a script */
	if (hdr->ih_type == IH_TYPE_SCRIPT) {
		addr = (char *)((char *)hdr + sizeof(*hdr));
		/* stick a NULL at the end of the script, otherwise */
		/* parse_string_outer() runs off the end. */
		addr[ntohl(hdr->ih_size)] = 0;
		addr += 8;
		parse_string_outer(addr, FLAG_PARSE_SEMICOLON);
		return 0;
	}

	start = aufl_layout[FIDX_TO_LIDX(idx)].start;
	end = aufl_layout[FIDX_TO_LIDX(idx)].end;

	/* unprotect the address range */
	/* this assumes that ONLY the firmware is protected! */
	if (idx == IDX_FIRMWARE) {
#undef AU_UPDATE_TEST
#ifdef AU_UPDATE_TEST
		/* erase it where Linux goes */
		start = aufl_layout[1].start;
		end = aufl_layout[1].end;
#endif
		flash_sect_protect(0, start, end);
	}

	/*
	 * erase the address range.
	 */
	debug ("flash_sect_erase(%lx, %lx);\n", start, end);
	flash_sect_erase(start, end);
	wait_ms(100);
	/* strip the header - except for the kernel and ramdisk */
	if (hdr->ih_type == IH_TYPE_KERNEL || hdr->ih_type == IH_TYPE_RAMDISK) {
		addr = (char *)hdr;
		off = sizeof(*hdr);
		nbytes = sizeof(*hdr) + ntohl(hdr->ih_size);
	} else {
		addr = (char *)((char *)hdr + sizeof(*hdr));
#ifdef AU_UPDATE_TEST
		/* copy it to where Linux goes */
		if (idx == IDX_FIRMWARE)
			start = aufl_layout[1].start;
#endif
		off = 0;
		nbytes = ntohl(hdr->ih_size);
	}

	/* copy the data from RAM to FLASH */
	debug ("flash_write(%p, %lx %x)\n", addr, start, nbytes);
	rc = flash_write(addr, start, nbytes);
	if (rc != 0) {
		printf("Flashing failed due to error %d\n", rc);
		return -1;
	}

	/* check the dcrc of the copy */
	if (crc32 (0, (uchar *)(start + off), ntohl(hdr->ih_size)) != ntohl(hdr->ih_dcrc)) {
		printf ("Image %s Bad Data Checksum After COPY\n", aufile[idx]);
		return -1;
	}

	/* protect the address range */
	/* this assumes that ONLY the firmware is protected! */
	if (idx == IDX_FIRMWARE)
		flash_sect_protect(1, start, end);
	return 0;
}

int
au_update_eeprom(int idx)
{
	image_header_t *hdr;
	int off;
	uint32_t val;

	/* special case for prepare.img */
	if (idx == IDX_PREPARE) {
		/* enable the power switch */
		*CPLD_VFD_BK &= ~POWER_OFF;
		return 0;
	}

	hdr = (image_header_t *)LOAD_ADDR;
	/* write the time field into EEPROM */
	off = auee_off[idx].time;
	val = ntohl(hdr->ih_time);
	i2c_write_multiple(0x54, off, 1, &val, sizeof(val));
	/* write the size field into EEPROM */
	off = auee_off[idx].size;
	val = ntohl(hdr->ih_size);
	i2c_write_multiple(0x54, off, 1, &val, sizeof(val));
	/* write the dcrc field into EEPROM */
	off = auee_off[idx].dcrc;
	val = ntohl(hdr->ih_dcrc);
	i2c_write_multiple(0x54, off, 1, &val, sizeof(val));
	/* enable the power switch */
	*CPLD_VFD_BK &= ~POWER_OFF;
	return 0;
}

/*
 * this is called from board_init() after the hardware has been set up
 * and is usable. That seems like a good time to do this.
 * Right now the return value is ignored.
 */
int
do_auto_update(void)
{
	block_dev_desc_t *stor_dev;
	long sz;
	int i, res, bitmap_first, cnt, old_ctrlc, got_ctrlc;
	char *env;
	long start, end;

#undef ERASE_EEPROM
#ifdef ERASE_EEPROM
	int arr[18];
	memset(arr, 0, sizeof(arr));
	i2c_write_multiple(0x54, 64, 1, arr, sizeof(arr));
#endif
	au_usb_stor_curr_dev = -1;
	/* start USB */
	if (usb_stop() < 0) {
		debug ("usb_stop failed\n");
		return -1;
	}
	if (usb_init() < 0) {
		debug ("usb_init failed\n");
		return -1;
	}
	/*
	 * check whether a storage device is attached (assume that it's
	 * a USB memory stick, since nothing else should be attached).
	 */
	au_usb_stor_curr_dev = usb_stor_scan(0);
	if (au_usb_stor_curr_dev == -1) {
		debug ("No device found. Not initialized?\n");
		return -1;
	}
	/* check whether it has a partition table */
	stor_dev = get_dev("usb", 0);
	if (stor_dev == NULL) {
		debug ("uknown device type\n");
		return -1;
	}
	if (fat_register_device(stor_dev, 1) != 0) {
		debug ("Unable to use USB %d:%d for fatls\n",
			au_usb_stor_curr_dev, 1);
		return -1;
	}
	if (file_fat_detectfs() != 0) {
		debug ("file_fat_detectfs failed\n");
	}

	/* initialize the array of file names */
	memset(aufile, 0, sizeof(aufile));
	aufile[IDX_PREPARE] = AU_PREPARE;
	aufile[IDX_PREINST] = AU_PREINST;
	aufile[IDX_FIRMWARE] = AU_FIRMWARE;
	aufile[IDX_KERNEL] = AU_KERNEL;
	aufile[IDX_APP] = AU_APP;
	aufile[IDX_DISK] = AU_DISK;
	aufile[IDX_POSTINST] = AU_POSTINST;
	/* initialize the array of flash sizes */
	memset(ausize, 0, sizeof(ausize));
	ausize[IDX_FIRMWARE] = (AU_FL_FIRMWARE_ND + 1) - AU_FL_FIRMWARE_ST;
	ausize[IDX_KERNEL] = (AU_FL_KERNEL_ND + 1) - AU_FL_KERNEL_ST;
	ausize[IDX_APP] = (AU_FL_APP_ND + 1) - AU_FL_APP_ST;
	ausize[IDX_DISK] = (AU_FL_DISK_ND + 1) - AU_FL_DISK_ST;
	/*
	 * now check whether start and end are defined using environment
	 * variables.
	 */
	start = -1;
	end = 0;
	env = getenv("firmware_st");
	if (env != NULL)
		start = simple_strtoul(env, NULL, 16);
	env = getenv("firmware_nd");
	if (env != NULL)
		end = simple_strtoul(env, NULL, 16);
	if (start >= 0 && end && end > start) {
		ausize[IDX_FIRMWARE] = (end + 1) - start;
		aufl_layout[0].start = start;
		aufl_layout[0].end = end;
	}
	start = -1;
	end = 0;
	env = getenv("kernel_st");
	if (env != NULL)
		start = simple_strtoul(env, NULL, 16);
	env = getenv("kernel_nd");
	if (env != NULL)
		end = simple_strtoul(env, NULL, 16);
	if (start >= 0 && end && end > start) {
		ausize[IDX_KERNEL] = (end + 1) - start;
		aufl_layout[1].start = start;
		aufl_layout[1].end = end;
	}
	start = -1;
	end = 0;
	env = getenv("app_st");
	if (env != NULL)
		start = simple_strtoul(env, NULL, 16);
	env = getenv("app_nd");
	if (env != NULL)
		end = simple_strtoul(env, NULL, 16);
	if (start >= 0 && end && end > start) {
		ausize[IDX_APP] = (end + 1) - start;
		aufl_layout[2].start = start;
		aufl_layout[2].end = end;
	}
	start = -1;
	end = 0;
	env = getenv("disk_st");
	if (env != NULL)
		start = simple_strtoul(env, NULL, 16);
	env = getenv("disk_nd");
	if (env != NULL)
		end = simple_strtoul(env, NULL, 16);
	if (start >= 0 && end && end > start) {
		ausize[IDX_DISK] = (end + 1) - start;
		aufl_layout[3].start = start;
		aufl_layout[3].end = end;
	}
	/* make certain that HUSH is runnable */
	u_boot_hush_start();
	/* make sure that we see CTRL-C and save the old state */
	old_ctrlc = disable_ctrlc(0);

	bitmap_first = 0;
	/* just loop thru all the possible files */
	for (i = 0; i < AU_MAXFILES; i++) {
		/* just read the header */
		sz = file_fat_read(aufile[i], LOAD_ADDR, sizeof(image_header_t));
		debug ("read %s sz %ld hdr %d\n",
			aufile[i], sz, sizeof(image_header_t));
		if (sz <= 0 || sz < sizeof(image_header_t)) {
			debug ("%s not found\n", aufile[i]);
			continue;
		}
		if (au_check_header_valid(i, sz) < 0) {
			debug ("%s header not valid\n", aufile[i]);
			continue;
		}
		sz = file_fat_read(aufile[i], LOAD_ADDR, MAX_LOADSZ);
		debug ("read %s sz %ld hdr %d\n",
			aufile[i], sz, sizeof(image_header_t));
		if (sz <= 0 || sz <= sizeof(image_header_t)) {
			debug ("%s not found\n", aufile[i]);
			continue;
		}
		if (au_check_cksum_valid(i, sz) < 0) {
			debug ("%s checksum not valid\n", aufile[i]);
			continue;
		}
#ifdef CONFIG_VFD
		/* now that we have a valid file we can display the */
		/* bitmap. */
		if (bitmap_first == 0) {
			env = getenv("bitmap2");
			if (env == NULL) {
				trab_vfd(0);
			} else {
				/* not so simple - bitmap2 is supposed to */
				/* contain the address of the bitmap */
				env = (char *)simple_strtoul(env, NULL, 16);
/* NOTE: these are taken from vfd_logo.h. If that file changes then */
/* these defines MUST also be updated! These may be wrong for bitmap2. */
#define VFD_LOGO_WIDTH 112
#define VFD_LOGO_HEIGHT 72
				/* must call transfer_pic directly */
				transfer_pic(3, (unsigned char *)env,
					     VFD_LOGO_HEIGHT, VFD_LOGO_WIDTH);
			}
			bitmap_first = 1;
		}
#endif
		/* this is really not a good idea, but it's what the */
		/* customer wants. */
		cnt = 0;
		got_ctrlc = 0;
		do {
			res = au_do_update(i, sz);
			/* let the user break out of the loop */
			if (ctrlc() || had_ctrlc()) {
				clear_ctrlc();
				if (res < 0)
					got_ctrlc = 1;
				break;
			}
			cnt++;
#ifdef AU_TEST_ONLY
		} while (res < 0 && cnt < 3);
		if (cnt < 3)
#else
		} while (res < 0);
#endif
		/*
		 * it doesn't make sense to update the EEPROM if the
		 * update was interrupted by the user due to errors.
		 */
		if (got_ctrlc == 0)
			au_update_eeprom(i);
		else
			/* enable the power switch */
			*CPLD_VFD_BK &= ~POWER_OFF;
	}
	usb_stop();
	/* restore the old state */
	disable_ctrlc(old_ctrlc);
	return 0;
}
#endif /* CONFIG_AUTO_UPDATE */