board/trab/auto_update.c

   1 /*
   2  * (C) Copyright 2003
   3  * Gary Jennejohn, DENX Software Engineering, gj@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <malloc.h>
  27 #include <image.h>
  28 #include <asm/byteorder.h>
  29 #include <usb.h>
  30
  31 #ifdef CFG_HUSH_PARSER
  32 #include <hush.h>
  33 #endif
  34
  35 #ifdef CONFIG_AUTO_UPDATE
  36
  37 #ifndef CONFIG_USB_OHCI
  38 #error "must define CONFIG_USB_OHCI"
  39 #endif
  40
  41 #ifndef CONFIG_USB_STORAGE
  42 #error "must define CONFIG_USB_STORAGE"
  43 #endif
  44
  45 #ifndef CFG_HUSH_PARSER
  46 #error "must define CFG_HUSH_PARSER"
  47 #endif
  48
  49 #if !(CONFIG_COMMANDS & CFG_CMD_FAT)
  50 #error "must define CFG_CMD_FAT"
  51 #endif
  52
  53 /*
  54  * Check whether a USB memory stick is plugged in.
  55  * If one is found:
  56  *      1) if prepare.img ist found load it into memory. If it is
  57  *              valid then run it.
  58  *      2) if preinst.img is found load it into memory. If it is
  59  *              valid then run it. Update the EEPROM.
  60  *      3) if firmw_01.img is found load it into memory. If it is valid,
  61  *              burn it into FLASH and update the EEPROM.
  62  *      4) if kernl_01.img is found load it into memory. If it is valid,
  63  *              burn it into FLASH and update the EEPROM.
  64  *      5) if app.img is found load it into memory. If it is valid,
  65  *              burn it into FLASH and update the EEPROM.
  66  *      6) if disk.img is found load it into memory. If it is valid,
  67  *              burn it into FLASH and update the EEPROM.
  68  *      7) if postinst.img is found load it into memory. If it is
  69  *              valid then run it. Update the EEPROM.
  70  */
  71
  72 #undef AU_DEBUG
  73
  74 #undef debug
  75 #ifdef  AU_DEBUG
  76 #define debug(fmt,args...)      printf (fmt ,##args)
  77 #else
  78 #define debug(fmt,args...)
  79 #endif  /* AU_DEBUG */
  80
  81 /* possible names of files on the USB stick. */
  82 #define AU_PREPARE      "prepare.img"
  83 #define AU_PREINST      "preinst.img"
  84 #define AU_FIRMWARE     "firmw_01.img"
  85 #define AU_KERNEL       "kernl_01.img"
  86 #define AU_APP          "app.img"
  87 #define AU_DISK         "disk.img"
  88 #define AU_POSTINST     "postinst.img"
  89
  90 struct flash_layout
  91 {
  92         long start;
  93         long end;
  94 };
  95
  96 /* layout of the FLASH. ST = start address, ND = end address. */
  97 #ifndef CONFIG_FLASH_8MB                        /* 16 MB Flash, 32 MB RAM */
  98 #define AU_FL_FIRMWARE_ST       0x00000000
  99 #define AU_FL_FIRMWARE_ND       0x0009FFFF
 100 #define AU_FL_VFD_ST            0x000A0000
 101 #define AU_FL_VFD_ND            0x000BFFFF
 102 #define AU_FL_KERNEL_ST         0x000C0000
 103 #define AU_FL_KERNEL_ND         0x001BFFFF
 104 #define AU_FL_APP_ST            0x001C0000
 105 #define AU_FL_APP_ND            0x005BFFFF
 106 #define AU_FL_DISK_ST           0x005C0000
 107 #define AU_FL_DISK_ND           0x00FFFFFF
 108 #else                                           /*  8 MB Flash, 32 MB RAM */
 109 #define AU_FL_FIRMWARE_ST       0x00000000
 110 #define AU_FL_FIRMWARE_ND       0x0005FFFF
 111 #define AU_FL_KERNEL_ST         0x00060000
 112 #define AU_FL_KERNEL_ND         0x0013FFFF
 113 #define AU_FL_APP_ST            0x00140000
 114 #define AU_FL_APP_ND            0x0067FFFF
 115 #define AU_FL_DISK_ST           0x00680000
 116 #define AU_FL_DISK_ND           0x007DFFFF
 117 #define AU_FL_VFD_ST            0x007E0000
 118 #define AU_FL_VFD_ND            0x007FFFFF
 119 #endif  /* CONFIG_FLASH_8MB */
 120
 121 /* a structure with the offsets to values in the EEPROM */
 122 struct eeprom_layout
 123 {
 124         int time;
 125         int size;
 126         int dcrc;
 127 };
 128
 129 /* layout of the EEPROM - offset from the start. All entries are 32 bit. */
 130 #define AU_EEPROM_TIME_PREINST  64
 131 #define AU_EEPROM_SIZE_PREINST  68
 132 #define AU_EEPROM_DCRC_PREINST  72
 133 #define AU_EEPROM_TIME_FIRMWARE 76
 134 #define AU_EEPROM_SIZE_FIRMWARE 80
 135 #define AU_EEPROM_DCRC_FIRMWARE 84
 136 #define AU_EEPROM_TIME_KERNEL   88
 137 #define AU_EEPROM_SIZE_KERNEL   92
 138 #define AU_EEPROM_DCRC_KERNEL   96
 139 #define AU_EEPROM_TIME_APP      100
 140 #define AU_EEPROM_SIZE_APP      104
 141 #define AU_EEPROM_DCRC_APP      108
 142 #define AU_EEPROM_TIME_DISK     112
 143 #define AU_EEPROM_SIZE_DISK     116
 144 #define AU_EEPROM_DCRC_DISK     120
 145 #define AU_EEPROM_TIME_POSTINST 124
 146 #define AU_EEPROM_SIZE_POSTINST 128
 147 #define AU_EEPROM_DCRC_POSTINST 132
 148
 149 static int au_usb_stor_curr_dev; /* current device */
 150
 151 /* index of each file in the following arrays */
 152 #define IDX_PREPARE     0
 153 #define IDX_PREINST     1
 154 #define IDX_FIRMWARE    2
 155 #define IDX_KERNEL      3
 156 #define IDX_APP         4
 157 #define IDX_DISK        5
 158 #define IDX_POSTINST    6
 159 /* max. number of files which could interest us */
 160 #define AU_MAXFILES 7
 161 /* pointers to file names */
 162 char *aufile[AU_MAXFILES];
 163 /* sizes of flash areas for each file */
 164 long ausize[AU_MAXFILES];
 165 /* offsets into the EEEPROM */
 166 struct eeprom_layout auee_off[AU_MAXFILES] = { \
 167         {0}, \
 168         {AU_EEPROM_TIME_PREINST, AU_EEPROM_SIZE_PREINST, AU_EEPROM_DCRC_PREINST,}, \
 169         {AU_EEPROM_TIME_FIRMWARE, AU_EEPROM_SIZE_FIRMWARE, AU_EEPROM_DCRC_FIRMWARE,}, \
 170         {AU_EEPROM_TIME_KERNEL, AU_EEPROM_SIZE_KERNEL, AU_EEPROM_DCRC_KERNEL,}, \
 171         {AU_EEPROM_TIME_APP, AU_EEPROM_SIZE_APP, AU_EEPROM_DCRC_APP,}, \
 172         {AU_EEPROM_TIME_DISK, AU_EEPROM_SIZE_DISK, AU_EEPROM_DCRC_DISK,}, \
 173         {AU_EEPROM_TIME_POSTINST, AU_EEPROM_SIZE_POSTINST, AU_EEPROM_DCRC_POSTINST,} \
 174         };
 175 /* array of flash areas start and end addresses */
 176 struct flash_layout aufl_layout[AU_MAXFILES - 3] = { \
 177         {AU_FL_FIRMWARE_ST, AU_FL_FIRMWARE_ND,}, \
 178         {AU_FL_KERNEL_ST, AU_FL_KERNEL_ND,}, \
 179         {AU_FL_APP_ST, AU_FL_APP_ND,}, \
 180         {AU_FL_DISK_ST, AU_FL_DISK_ND,}, \
 181 };
 182 /* convert the index into aufile[] to an index into aufl_layout[] */
 183 #define FIDX_TO_LIDX(idx) ((idx) - 2)
 184
 185 /* where to load files into memory */
 186 #define LOAD_ADDR ((unsigned char *)0x0C100000)
 187 /* the app is the largest image */
 188 #define MAX_LOADSZ ausize[IDX_APP]
 189
 190 /* externals */
 191 extern int fat_register_device(block_dev_desc_t *, int);
 192 extern int file_fat_detectfs(void);
 193 extern long file_fat_read(const char *, void *, unsigned long);
 194 extern int i2c_read (unsigned char, unsigned int, int , unsigned char* , int);
 195 extern int i2c_write (uchar, uint, int , uchar* , int);
 196 #ifdef CONFIG_VFD
 197 extern int trab_vfd (ulong);
 198 extern int transfer_pic(unsigned char, unsigned char *, int, int);
 199 #endif
 200 extern int flash_sect_erase(ulong, ulong);
 201 extern int flash_sect_protect (int, ulong, ulong);
 202 extern int flash_write (char *, ulong, ulong);
 203 /* change char* to void* to shutup the compiler */
 204 extern int i2c_write_multiple (uchar, uint, int, void *, int);
 205 extern int i2c_read_multiple (uchar, uint, int, void *, int);
 206 extern block_dev_desc_t *get_dev (char*, int);
 207 extern int u_boot_hush_start(void);
 208
 209 int
 210 au_check_cksum_valid(int idx, long nbytes)
 211 {
 212         image_header_t *hdr;
 213         unsigned long checksum;
 214
 215         hdr = (image_header_t *)LOAD_ADDR;
 216
 217         if (nbytes != (sizeof(*hdr) + ntohl(hdr->ih_size)))
 218         {
 219                 printf ("Image %s bad total SIZE\n", aufile[idx]);
 220                 return -1;
 221         }
 222         /* check the data CRC */
 223         checksum = ntohl(hdr->ih_dcrc);
 224
 225         if (crc32 (0, (uchar *)(LOAD_ADDR + sizeof(*hdr)), ntohl(hdr->ih_size))
 226                 != checksum)
 227         {
 228                 printf ("Image %s bad data checksum\n", aufile[idx]);
 229                 return -1;
 230         }
 231         return 0;
 232 }
 233
 234 int
 235 au_check_header_valid(int idx, long nbytes)
 236 {
 237         image_header_t *hdr;
 238         unsigned long checksum;
 239         unsigned char buf[4];
 240
 241         hdr = (image_header_t *)LOAD_ADDR;
 242         /* check the easy ones first */
 243 #undef CHECK_VALID_DEBUG
 244 #ifdef CHECK_VALID_DEBUG
 245         printf("magic %#x %#x ", ntohl(hdr->ih_magic), IH_MAGIC);
 246         printf("arch %#x %#x ", hdr->ih_arch, IH_CPU_ARM);
 247         printf("size %#x %#lx ", ntohl(hdr->ih_size), nbytes);
 248         printf("type %#x %#x ", hdr->ih_type, IH_TYPE_KERNEL);
 249 #endif
 250         if (nbytes < sizeof(*hdr))
 251         {
 252                 printf ("Image %s bad header SIZE\n", aufile[idx]);
 253                 return -1;
 254         }
 255         if (ntohl(hdr->ih_magic) != IH_MAGIC || hdr->ih_arch != IH_CPU_ARM)
 256         {
 257                 printf ("Image %s bad MAGIC or ARCH\n", aufile[idx]);
 258                 return -1;
 259         }
 260         /* check the hdr CRC */
 261         checksum = ntohl(hdr->ih_hcrc);
 262         hdr->ih_hcrc = 0;
 263
 264         if (crc32 (0, (uchar *)hdr, sizeof(*hdr)) != checksum) {
 265                 printf ("Image %s bad header checksum\n", aufile[idx]);
 266                 return -1;
 267         }
 268         hdr->ih_hcrc = htonl(checksum);
 269         /* check the type - could do this all in one gigantic if() */
 270         if ((idx == IDX_FIRMWARE) && (hdr->ih_type != IH_TYPE_FIRMWARE)) {
 271                 printf ("Image %s wrong type\n", aufile[idx]);
 272                 return -1;
 273         }
 274         if ((idx == IDX_KERNEL) && (hdr->ih_type != IH_TYPE_KERNEL)) {
 275                 printf ("Image %s wrong type\n", aufile[idx]);
 276                 return -1;
 277         }
 278         if ((idx == IDX_DISK) && (hdr->ih_type != IH_TYPE_FILESYSTEM)) {
 279                 printf ("Image %s wrong type\n", aufile[idx]);
 280                 return -1;
 281         }
 282         if ((idx == IDX_APP) && (hdr->ih_type != IH_TYPE_RAMDISK)
 283             && (hdr->ih_type != IH_TYPE_FILESYSTEM)) {
 284                 printf ("Image %s wrong type\n", aufile[idx]);
 285                 return -1;
 286         }
 287         if ((idx == IDX_PREPARE || idx == IDX_PREINST || idx == IDX_POSTINST)
 288                 && (hdr->ih_type != IH_TYPE_SCRIPT))
 289         {
 290                 printf ("Image %s wrong type\n", aufile[idx]);
 291                 return -1;
 292         }
 293         /* special case for prepare.img */
 294         if (idx == IDX_PREPARE)
 295                 return 0;
 296         /* recycle checksum */
 297         checksum = ntohl(hdr->ih_size);
 298         /* for kernel and app the image header must also fit into flash */
 299         if ((idx != IDX_DISK) && (idx != IDX_FIRMWARE))
 300                 checksum += sizeof(*hdr);
 301         /* check the size does not exceed space in flash. HUSH scripts */
 302         /* all have ausize[] set to 0 */
 303         if ((ausize[idx] != 0) && (ausize[idx] < checksum)) {
 304                 printf ("Image %s is bigger than FLASH\n", aufile[idx]);
 305                 return -1;
 306         }
 307         /* check the time stamp from the EEPROM */
 308         /* read it in */
 309         i2c_read_multiple(0x54, auee_off[idx].time, 1, buf, sizeof(buf));
 310 #ifdef CHECK_VALID_DEBUG
 311         printf ("buf[0] %#x buf[1] %#x buf[2] %#x buf[3] %#x "
 312                 "as int %#x time %#x\n",
 313                 buf[0], buf[1], buf[2], buf[3],
 314                 *((unsigned int *)buf), ntohl(hdr->ih_time));
 315 #endif
 316         /* check it */
 317         if (*((unsigned int *)buf) >= ntohl(hdr->ih_time)) {
 318                 printf ("Image %s is too old\n", aufile[idx]);
 319                 return -1;
 320         }
 321
 322         return 0;
 323 }
 324
 325 /* power control defines */
 326 #define CPLD_VFD_BK ((volatile char *)0x04038002)
 327 #define POWER_OFF (1 << 1)
 328
 329 int
 330 au_do_update(int idx, long sz)
 331 {
 332         image_header_t *hdr;
 333         char *addr;
 334         long start, end;
 335         int off, rc;
 336         uint nbytes;
 337
 338         hdr = (image_header_t *)LOAD_ADDR;
 339
 340         /* disable the power switch */
 341         *CPLD_VFD_BK |= POWER_OFF;
 342
 343         /* execute a script */
 344         if (hdr->ih_type == IH_TYPE_SCRIPT) {
 345                 addr = (char *)((char *)hdr + sizeof(*hdr));
 346                 /* stick a NULL at the end of the script, otherwise */
 347                 /* parse_string_outer() runs off the end. */
 348                 addr[ntohl(hdr->ih_size)] = 0;
 349                 addr += 8;
 350                 parse_string_outer(addr, FLAG_PARSE_SEMICOLON);
 351                 return 0;
 352         }
 353
 354         start = aufl_layout[FIDX_TO_LIDX(idx)].start;
 355         end = aufl_layout[FIDX_TO_LIDX(idx)].end;
 356
 357         /* unprotect the address range */
 358         /* this assumes that ONLY the firmware is protected! */
 359         if (idx == IDX_FIRMWARE) {
 360 #undef AU_UPDATE_TEST
 361 #ifdef AU_UPDATE_TEST
 362                 /* erase it where Linux goes */
 363                 start = aufl_layout[1].start;
 364                 end = aufl_layout[1].end;
 365 #endif
 366                 flash_sect_protect(0, start, end);
 367         }
 368
 369         /*
 370          * erase the address range.
 371          */
 372         debug ("flash_sect_erase(%lx, %lx);\n", start, end);
 373         flash_sect_erase(start, end);
 374         wait_ms(100);
 375         /* strip the header - except for the kernel and ramdisk */
 376         if (hdr->ih_type == IH_TYPE_KERNEL || hdr->ih_type == IH_TYPE_RAMDISK) {
 377                 addr = (char *)hdr;
 378                 off = sizeof(*hdr);
 379                 nbytes = sizeof(*hdr) + ntohl(hdr->ih_size);
 380         } else {
 381                 addr = (char *)((char *)hdr + sizeof(*hdr));
 382 #ifdef AU_UPDATE_TEST
 383                 /* copy it to where Linux goes */
 384                 if (idx == IDX_FIRMWARE)
 385                         start = aufl_layout[1].start;
 386 #endif
 387                 off = 0;
 388                 nbytes = ntohl(hdr->ih_size);
 389         }
 390
 391         /* copy the data from RAM to FLASH */
 392         debug ("flash_write(%p, %lx %x)\n", addr, start, nbytes);
 393         rc = flash_write(addr, start, nbytes);
 394         if (rc != 0) {
 395                 printf("Flashing failed due to error %d\n", rc);
 396                 return -1;
 397         }
 398
 399         /* check the dcrc of the copy */
 400         if (crc32 (0, (uchar *)(start + off), ntohl(hdr->ih_size)) != ntohl(hdr->ih_dcrc)) {
 401                 printf ("Image %s Bad Data Checksum After COPY\n", aufile[idx]);
 402                 return -1;
 403         }
 404
 405         /* protect the address range */
 406         /* this assumes that ONLY the firmware is protected! */
 407         if (idx == IDX_FIRMWARE)
 408                 flash_sect_protect(1, start, end);
 409         return 0;
 410 }
 411
 412 int
 413 au_update_eeprom(int idx)
 414 {
 415         image_header_t *hdr;
 416         int off;
 417         uint32_t val;
 418
 419         /* special case for prepare.img */
 420         if (idx == IDX_PREPARE) {
 421                 /* enable the power switch */
 422                 *CPLD_VFD_BK &= ~POWER_OFF;
 423                 return 0;
 424         }
 425
 426         hdr = (image_header_t *)LOAD_ADDR;
 427         /* write the time field into EEPROM */
 428         off = auee_off[idx].time;
 429         val = ntohl(hdr->ih_time);
 430         i2c_write_multiple(0x54, off, 1, &val, sizeof(val));
 431         /* write the size field into EEPROM */
 432         off = auee_off[idx].size;
 433         val = ntohl(hdr->ih_size);
 434         i2c_write_multiple(0x54, off, 1, &val, sizeof(val));
 435         /* write the dcrc field into EEPROM */
 436         off = auee_off[idx].dcrc;
 437         val = ntohl(hdr->ih_dcrc);
 438         i2c_write_multiple(0x54, off, 1, &val, sizeof(val));
 439         /* enable the power switch */
 440         *CPLD_VFD_BK &= ~POWER_OFF;
 441         return 0;
 442 }
 443
 444 /*
 445  * this is called from board_init() after the hardware has been set up
 446  * and is usable. That seems like a good time to do this.
 447  * Right now the return value is ignored.
 448  */
 449 int
 450 do_auto_update(void)
 451 {
 452         block_dev_desc_t *stor_dev;
 453         long sz;
 454         int i, res, bitmap_first, cnt, old_ctrlc, got_ctrlc;
 455         char *env;
 456         long start, end;
 457
 458 #undef ERASE_EEPROM
 459 #ifdef ERASE_EEPROM
 460         int arr[18];
 461         memset(arr, 0, sizeof(arr));
 462         i2c_write_multiple(0x54, 64, 1, arr, sizeof(arr));
 463 #endif
 464         au_usb_stor_curr_dev = -1;
 465         /* start USB */
 466         if (usb_stop() < 0) {
 467                 debug ("usb_stop failed\n");
 468                 return -1;
 469         }
 470         if (usb_init() < 0) {
 471                 debug ("usb_init failed\n");
 472                 return -1;
 473         }
 474         /*
 475          * check whether a storage device is attached (assume that it's
 476          * a USB memory stick, since nothing else should be attached).
 477          */
 478         au_usb_stor_curr_dev = usb_stor_scan(0);
 479         if (au_usb_stor_curr_dev == -1) {
 480                 debug ("No device found. Not initialized?\n");
 481                 return -1;
 482         }
 483         /* check whether it has a partition table */
 484         stor_dev = get_dev("usb", 0);
 485         if (stor_dev == NULL) {
 486                 debug ("uknown device type\n");
 487                 return -1;
 488         }
 489         if (fat_register_device(stor_dev, 1) != 0) {
 490                 debug ("Unable to use USB %d:%d for fatls\n",
 491                         au_usb_stor_curr_dev, 1);
 492                 return -1;
 493         }
 494         if (file_fat_detectfs() != 0) {
 495                 debug ("file_fat_detectfs failed\n");
 496         }
 497
 498         /* initialize the array of file names */
 499         memset(aufile, 0, sizeof(aufile));
 500         aufile[IDX_PREPARE] = AU_PREPARE;
 501         aufile[IDX_PREINST] = AU_PREINST;
 502         aufile[IDX_FIRMWARE] = AU_FIRMWARE;
 503         aufile[IDX_KERNEL] = AU_KERNEL;
 504         aufile[IDX_APP] = AU_APP;
 505         aufile[IDX_DISK] = AU_DISK;
 506         aufile[IDX_POSTINST] = AU_POSTINST;
 507         /* initialize the array of flash sizes */
 508         memset(ausize, 0, sizeof(ausize));
 509         ausize[IDX_FIRMWARE] = (AU_FL_FIRMWARE_ND + 1) - AU_FL_FIRMWARE_ST;
 510         ausize[IDX_KERNEL] = (AU_FL_KERNEL_ND + 1) - AU_FL_KERNEL_ST;
 511         ausize[IDX_APP] = (AU_FL_APP_ND + 1) - AU_FL_APP_ST;
 512         ausize[IDX_DISK] = (AU_FL_DISK_ND + 1) - AU_FL_DISK_ST;
 513         /*
 514          * now check whether start and end are defined using environment
 515          * variables.
 516          */
 517         start = -1;
 518         end = 0;
 519         env = getenv("firmware_st");
 520         if (env != NULL)
 521                 start = simple_strtoul(env, NULL, 16);
 522         env = getenv("firmware_nd");
 523         if (env != NULL)
 524                 end = simple_strtoul(env, NULL, 16);
 525         if (start >= 0 && end && end > start) {
 526                 ausize[IDX_FIRMWARE] = (end + 1) - start;
 527                 aufl_layout[0].start = start;
 528                 aufl_layout[0].end = end;
 529         }
 530         start = -1;
 531         end = 0;
 532         env = getenv("kernel_st");
 533         if (env != NULL)
 534                 start = simple_strtoul(env, NULL, 16);
 535         env = getenv("kernel_nd");
 536         if (env != NULL)
 537                 end = simple_strtoul(env, NULL, 16);
 538         if (start >= 0 && end && end > start) {
 539                 ausize[IDX_KERNEL] = (end + 1) - start;
 540                 aufl_layout[1].start = start;
 541                 aufl_layout[1].end = end;
 542         }
 543         start = -1;
 544         end = 0;
 545         env = getenv("app_st");
 546         if (env != NULL)
 547                 start = simple_strtoul(env, NULL, 16);
 548         env = getenv("app_nd");
 549         if (env != NULL)
 550                 end = simple_strtoul(env, NULL, 16);
 551         if (start >= 0 && end && end > start) {
 552                 ausize[IDX_APP] = (end + 1) - start;
 553                 aufl_layout[2].start = start;
 554                 aufl_layout[2].end = end;
 555         }
 556         start = -1;
 557         end = 0;
 558         env = getenv("disk_st");
 559         if (env != NULL)
 560                 start = simple_strtoul(env, NULL, 16);
 561         env = getenv("disk_nd");
 562         if (env != NULL)
 563                 end = simple_strtoul(env, NULL, 16);
 564         if (start >= 0 && end && end > start) {
 565                 ausize[IDX_DISK] = (end + 1) - start;
 566                 aufl_layout[3].start = start;
 567                 aufl_layout[3].end = end;
 568         }
 569         /* make certain that HUSH is runnable */
 570         u_boot_hush_start();
 571         /* make sure that we see CTRL-C and save the old state */
 572         old_ctrlc = disable_ctrlc(0);
 573
 574         bitmap_first = 0;
 575         /* just loop thru all the possible files */
 576         for (i = 0; i < AU_MAXFILES; i++) {
 577                 /* just read the header */
 578                 sz = file_fat_read(aufile[i], LOAD_ADDR, sizeof(image_header_t));
 579                 debug ("read %s sz %ld hdr %d\n",
 580                         aufile[i], sz, sizeof(image_header_t));
 581                 if (sz <= 0 || sz < sizeof(image_header_t)) {
 582                         debug ("%s not found\n", aufile[i]);
 583                         continue;
 584                 }
 585                 if (au_check_header_valid(i, sz) < 0) {
 586                         debug ("%s header not valid\n", aufile[i]);
 587                         continue;
 588                 }
 589                 sz = file_fat_read(aufile[i], LOAD_ADDR, MAX_LOADSZ);
 590                 debug ("read %s sz %ld hdr %d\n",
 591                         aufile[i], sz, sizeof(image_header_t));
 592                 if (sz <= 0 || sz <= sizeof(image_header_t)) {
 593                         debug ("%s not found\n", aufile[i]);
 594                         continue;
 595                 }
 596                 if (au_check_cksum_valid(i, sz) < 0) {
 597                         debug ("%s checksum not valid\n", aufile[i]);
 598                         continue;
 599                 }
 600 #ifdef CONFIG_VFD
 601                 /* now that we have a valid file we can display the */
 602                 /* bitmap. */
 603                 if (bitmap_first == 0) {
 604                         env = getenv("bitmap2");
 605                         if (env == NULL) {
 606                                 trab_vfd(0);
 607                         } else {
 608                                 /* not so simple - bitmap2 is supposed to */
 609                                 /* contain the address of the bitmap */
 610                                 env = (char *)simple_strtoul(env, NULL, 16);
 611 /* NOTE: these are taken from vfd_logo.h. If that file changes then */
 612 /* these defines MUST also be updated! These may be wrong for bitmap2. */
 613 #define VFD_LOGO_WIDTH 112
 614 #define VFD_LOGO_HEIGHT 72
 615                                 /* must call transfer_pic directly */
 616                                 transfer_pic(3, (unsigned char *)env,
 617                                              VFD_LOGO_HEIGHT, VFD_LOGO_WIDTH);
 618                         }
 619                         bitmap_first = 1;
 620                 }
 621 #endif
 622                 /* this is really not a good idea, but it's what the */
 623                 /* customer wants. */
 624                 cnt = 0;
 625                 got_ctrlc = 0;
 626                 do {
 627                         res = au_do_update(i, sz);
 628                         /* let the user break out of the loop */
 629                         if (ctrlc() || had_ctrlc()) {
 630                                 clear_ctrlc();
 631                                 if (res < 0)
 632                                         got_ctrlc = 1;
 633                                 break;
 634                         }
 635                         cnt++;
 636 #ifdef AU_TEST_ONLY
 637                 } while (res < 0 && cnt < 3);
 638                 if (cnt < 3)
 639 #else
 640                 } while (res < 0);
 641 #endif
 642                 /*
 643                  * it doesn't make sense to update the EEPROM if the
 644                  * update was interrupted by the user due to errors.
 645                  */
 646                 if (got_ctrlc == 0)
 647                         au_update_eeprom(i);
 648                 else
 649                         /* enable the power switch */
 650                         *CPLD_VFD_BK &= ~POWER_OFF;
 651         }
 652         usb_stop();
 653         /* restore the old state */
 654         disable_ctrlc(old_ctrlc);
 655         return 0;
 656 }
 657 #endif /* CONFIG_AUTO_UPDATE */