lib_m68k/board.c

   1 /*
   2  * (C) Copyright 2003
   3  * Josef Baumgartner <josef.baumgartner@telex.de>
   4  *
   5  * (C) Copyright 2000-2002
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <watchdog.h>
  29 #include <command.h>
  30 #include <malloc.h>
  31 #include <devices.h>
  32
  33 #ifdef  CONFIG_M5272
  34 #include <asm/immap_5272.h>
  35 #endif
  36
  37 #if (CONFIG_COMMANDS & CFG_CMD_IDE)
  38 #include <ide.h>
  39 #endif
  40 #if (CONFIG_COMMANDS & CFG_CMD_SCSI)
  41 #include <scsi.h>
  42 #endif
  43 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
  44 #include <kgdb.h>
  45 #endif
  46 #ifdef CONFIG_STATUS_LED
  47 #include <status_led.h>
  48 #endif
  49 #include <net.h>
  50 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
  51 #include <cmd_bedbug.h>
  52 #endif
  53 #ifdef CFG_ALLOC_DPRAM
  54 #include <commproc.h>
  55 #endif
  56 #include <version.h>
  57
  58 #if defined(CONFIG_HARD_I2C) || \
  59     defined(CONFIG_SOFT_I2C)
  60 #include <i2c.h>
  61 #endif
  62
  63 static char *failed = "*** failed ***\n";
  64
  65 #ifdef  CONFIG_PCU_E
  66 extern flash_info_t flash_info[];
  67 #endif
  68
  69 #include <environment.h>
  70
  71 #if ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
  72       (CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
  73     defined(CFG_ENV_IS_IN_NVRAM)
  74 #define TOTAL_MALLOC_LEN        (CFG_MALLOC_LEN + CFG_ENV_SIZE)
  75 #else
  76 #define TOTAL_MALLOC_LEN        CFG_MALLOC_LEN
  77 #endif
  78
  79 extern ulong __init_end;
  80 extern ulong _end;
  81
  82 extern  void timer_init(void);
  83
  84 #if defined(CONFIG_WATCHDOG)
  85 # define INIT_FUNC_WATCHDOG_INIT        watchdog_init,
  86 # define WATCHDOG_DISABLE               watchdog_disable
  87
  88 extern int watchdog_init(void);
  89 extern int watchdog_disable(void);
  90 #else
  91 # define INIT_FUNC_WATCHDOG_INIT        /* undef */
  92 # define WATCHDOG_DISABLE               /* undef */
  93 #endif /* CONFIG_WATCHDOG */
  94
  95 ulong monitor_flash_len;
  96
  97 /*
  98  * Begin and End of memory area for malloc(), and current "brk"
  99  */
 100 static  ulong   mem_malloc_start = 0;
 101 static  ulong   mem_malloc_end   = 0;
 102 static  ulong   mem_malloc_brk   = 0;
 103
 104 /************************************************************************
 105  * Utilities                                                            *
 106  ************************************************************************
 107  */
 108
 109 /*
 110  * The Malloc area is immediately below the monitor copy in DRAM
 111  */
 112 static void mem_malloc_init (void)
 113 {
 114         DECLARE_GLOBAL_DATA_PTR;
 115
 116         ulong dest_addr = CFG_MONITOR_BASE + gd->reloc_off;
 117
 118         mem_malloc_end = dest_addr;
 119         mem_malloc_start = dest_addr - TOTAL_MALLOC_LEN;
 120         mem_malloc_brk = mem_malloc_start;
 121
 122         memset ((void *) mem_malloc_start,
 123                 0,
 124                 mem_malloc_end - mem_malloc_start);
 125 }
 126
 127 void *sbrk (ptrdiff_t increment)
 128 {
 129         ulong old = mem_malloc_brk;
 130         ulong new = old + increment;
 131
 132         if ((new < mem_malloc_start) ||
 133             (new > mem_malloc_end) ) {
 134                 return (NULL);
 135         }
 136         mem_malloc_brk = new;
 137         return ((void *)old);
 138 }
 139
 140 char *strmhz(char *buf, long hz)
 141 {
 142     long l, n;
 143     long m;
 144
 145     n = hz / 1000000L;
 146
 147     l = sprintf (buf, "%ld", n);
 148
 149     m = (hz % 1000000L) / 1000L;
 150
 151     if (m != 0)
 152         sprintf (buf+l, ".%03ld", m);
 153
 154     return (buf);
 155 }
 156
 157 /*
 158  * All attempts to come up with a "common" initialization sequence
 159  * that works for all boards and architectures failed: some of the
 160  * requirements are just _too_ different. To get rid of the resulting
 161  * mess of board dependend #ifdef'ed code we now make the whole
 162  * initialization sequence configurable to the user.
 163  *
 164  * The requirements for any new initalization function is simple: it
 165  * receives a pointer to the "global data" structure as it's only
 166  * argument, and returns an integer return code, where 0 means
 167  * "continue" and != 0 means "fatal error, hang the system".
 168  */
 169 typedef int (init_fnc_t) (void);
 170
 171 /************************************************************************
 172  * Init Utilities                                                       *
 173  ************************************************************************
 174  * Some of this code should be moved into the core functions,
 175  * but let's get it working (again) first...
 176  */
 177
 178 static int init_baudrate (void)
 179 {
 180         DECLARE_GLOBAL_DATA_PTR;
 181
 182         uchar tmp[64];  /* long enough for environment variables */
 183         int i = getenv_r ("baudrate", tmp, sizeof (tmp));
 184
 185         gd->baudrate = (i > 0)
 186                         ? (int) simple_strtoul (tmp, NULL, 10)
 187                         : CONFIG_BAUDRATE;
 188         return (0);
 189 }
 190
 191 /***********************************************************************/
 192
 193 static int init_func_ram (void)
 194 {
 195         DECLARE_GLOBAL_DATA_PTR;
 196
 197         int board_type = 0;     /* use dummy arg */
 198         puts ("DRAM:  ");
 199
 200         if ((gd->ram_size = initdram (board_type)) > 0) {
 201                 print_size (gd->ram_size, "\n");
 202                 return (0);
 203         }
 204         puts (failed);
 205         return (1);
 206 }
 207
 208 /***********************************************************************/
 209
 210 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 211 static int init_func_i2c (void)
 212 {
 213         puts ("I2C:   ");
 214         i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
 215         puts ("ready\n");
 216         return (0);
 217 }
 218 #endif
 219
 220 /***********************************************************************/
 221
 222 /************************************************************************
 223  * Initialization sequence                                              *
 224  ************************************************************************
 225  */
 226
 227 init_fnc_t *init_sequence[] = {
 228         env_init,
 229         init_baudrate,
 230         serial_init,
 231         console_init_f,
 232         display_options,
 233         checkcpu,
 234         checkboard,
 235 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 236         init_func_i2c,
 237 #endif
 238         init_func_ram,
 239 #if defined(CFG_DRAM_TEST)
 240         testdram,
 241 #endif /* CFG_DRAM_TEST */
 242         INIT_FUNC_WATCHDOG_INIT
 243         NULL,                   /* Terminate this list */
 244 };
 245
 246
 247 /************************************************************************
 248  *
 249  * This is the first part of the initialization sequence that is
 250  * implemented in C, but still running from ROM.
 251  *
 252  * The main purpose is to provide a (serial) console interface as
 253  * soon as possible (so we can see any error messages), and to
 254  * initialize the RAM so that we can relocate the monitor code to
 255  * RAM.
 256  *
 257  * Be aware of the restrictions: global data is read-only, BSS is not
 258  * initialized, and stack space is limited to a few kB.
 259  *
 260  ************************************************************************
 261  */
 262
 263 void
 264 board_init_f (ulong bootflag)
 265 {
 266     DECLARE_GLOBAL_DATA_PTR;
 267
 268         bd_t *bd;
 269         ulong len, addr, addr_sp;
 270         gd_t *id;
 271         init_fnc_t **init_fnc_ptr;
 272 #ifdef CONFIG_PRAM
 273         int i;
 274         ulong reg;
 275         uchar tmp[64];          /* long enough for environment variables */
 276 #endif
 277
 278         /* Pointer is writable since we allocated a register for it */
 279         gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET);
 280         /* compiler optimization barrier needed for GCC >= 3.4 */
 281         __asm__ __volatile__("": : :"memory");
 282
 283         /* Clear initial global data */
 284         memset ((void *) gd, 0, sizeof (gd_t));
 285
 286         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 287                 if ((*init_fnc_ptr)() != 0) {
 288                         hang ();
 289                 }
 290         }
 291
 292         /*
 293          * Now that we have DRAM mapped and working, we can
 294          * relocate the code and continue running from DRAM.
 295          *
 296          * Reserve memory at end of RAM for (top down in that order):
 297          *      - protected RAM
 298          *      - LCD framebuffer
 299          *      - monitor code
 300          *      - board info struct
 301          */
 302         len = (ulong)&_end - CFG_MONITOR_BASE;
 303
 304         addr = CFG_SDRAM_BASE + gd->ram_size;
 305
 306 #ifdef CONFIG_LOGBUFFER
 307         /* reserve kernel log buffer */
 308         addr -= (LOGBUFF_RESERVE);
 309         debug ("Reserving %dk for kernel logbuffer at %08lx\n", LOGBUFF_LEN, addr);
 310 #endif
 311
 312 #ifdef CONFIG_PRAM
 313         /*
 314          * reserve protected RAM
 315          */
 316         i = getenv_r ("pram", tmp, sizeof (tmp));
 317         reg = (i > 0) ? simple_strtoul (tmp, NULL, 10) : CONFIG_PRAM;
 318         addr -= (reg << 10);            /* size is in kB */
 319         debug ("Reserving %ldk for protected RAM at %08lx\n", reg, addr);
 320 #endif /* CONFIG_PRAM */
 321
 322         /*
 323          * reserve memory for U-Boot code, data & bss
 324          * round down to next 4 kB limit
 325          */
 326         addr -= len;
 327         addr &= ~(4096 - 1);
 328
 329         debug ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
 330
 331         /*
 332          * reserve memory for malloc() arena
 333          */
 334         addr_sp = addr - TOTAL_MALLOC_LEN;
 335         debug ("Reserving %dk for malloc() at: %08lx\n",
 336                         TOTAL_MALLOC_LEN >> 10, addr_sp);
 337
 338         /*
 339          * (permanently) allocate a Board Info struct
 340          * and a permanent copy of the "global" data
 341          */
 342         addr_sp -= sizeof (bd_t);
 343         bd = (bd_t *) addr_sp;
 344         gd->bd = bd;
 345         debug ("Reserving %d Bytes for Board Info at: %08lx\n",
 346                         sizeof (bd_t), addr_sp);
 347         addr_sp -= sizeof (gd_t);
 348         id = (gd_t *) addr_sp;
 349         debug ("Reserving %d Bytes for Global Data at: %08lx\n",
 350                         sizeof (gd_t), addr_sp);
 351
 352         /* Reserve memory for boot params. */
 353         addr_sp -= CFG_BOOTPARAMS_LEN;
 354         bd->bi_boot_params = addr_sp;
 355         debug ("Reserving %dk for boot parameters at: %08lx\n",
 356                         CFG_BOOTPARAMS_LEN >> 10, addr_sp);
 357
 358         /*
 359          * Finally, we set up a new (bigger) stack.
 360          *
 361          * Leave some safety gap for SP, force alignment on 16 byte boundary
 362          * Clear initial stack frame
 363          */
 364         addr_sp -= 16;
 365         addr_sp &= ~0xF;
 366         *((ulong *) addr_sp)-- = 0;
 367         *((ulong *) addr_sp)-- = 0;
 368         debug ("Stack Pointer at: %08lx\n", addr_sp);
 369
 370         /*
 371          * Save local variables to board info struct
 372          */
 373         bd->bi_memstart  = CFG_SDRAM_BASE;      /* start of  DRAM memory      */
 374         bd->bi_memsize   = gd->ram_size;        /* size  of  DRAM memory in bytes */
 375         bd->bi_mbar_base = CFG_MBAR;            /* base of internal registers */
 376
 377         bd->bi_bootflags = bootflag;            /* boot / reboot flag (for LynxOS)    */
 378
 379         WATCHDOG_RESET ();
 380         bd->bi_intfreq = gd->cpu_clk;   /* Internal Freq, in Hz */
 381         bd->bi_busfreq = gd->bus_clk;   /* Bus Freq,      in Hz */
 382         bd->bi_baudrate = gd->baudrate; /* Console Baudrate     */
 383
 384 #ifdef CFG_EXTBDINFO
 385         strncpy (bd->bi_s_version, "1.2", sizeof (bd->bi_s_version));
 386         strncpy (bd->bi_r_version, U_BOOT_VERSION, sizeof (bd->bi_r_version));
 387 #endif
 388
 389         WATCHDOG_RESET ();
 390
 391 #ifdef CONFIG_POST
 392         post_bootmode_init();
 393         post_run (NULL, POST_ROM | post_bootmode_get(0));
 394 #endif
 395
 396         WATCHDOG_RESET();
 397
 398         memcpy (id, (void *)gd, sizeof (gd_t));
 399
 400         debug ("Start relocate of code from %08x to %08lx\n", CFG_MONITOR_BASE, addr);
 401         relocate_code (addr_sp, id, addr);
 402
 403         /* NOTREACHED - jump_to_ram() does not return */
 404 }
 405
 406 /************************************************************************
 407  *
 408  * This is the next part if the initialization sequence: we are now
 409  * running from RAM and have a "normal" C environment, i. e. global
 410  * data can be written, BSS has been cleared, the stack size in not
 411  * that critical any more, etc.
 412  *
 413  ************************************************************************
 414  */
 415 void board_init_r (gd_t *id, ulong dest_addr)
 416 {
 417         DECLARE_GLOBAL_DATA_PTR;
 418         cmd_tbl_t *cmdtp;
 419         char *s, *e;
 420         bd_t *bd;
 421         int i;
 422         extern void malloc_bin_reloc (void);
 423
 424 #ifndef CFG_ENV_IS_NOWHERE
 425         extern char * env_name_spec;
 426 #endif
 427 #ifndef CFG_NO_FLASH
 428         ulong flash_size;
 429 #endif
 430         gd = id;                /* initialize RAM version of global data */
 431         bd = gd->bd;
 432
 433         gd->flags |= GD_FLG_RELOC;      /* tell others: relocation done */
 434
 435         debug ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
 436
 437         WATCHDOG_RESET ();
 438
 439         gd->reloc_off =  dest_addr - CFG_MONITOR_BASE;
 440
 441         monitor_flash_len = (ulong)&__init_end - dest_addr;
 442
 443         /*
 444          * We have to relocate the command table manually
 445          */
 446         for (cmdtp = &__u_boot_cmd_start; cmdtp !=  &__u_boot_cmd_end; cmdtp++) {
 447                 ulong addr;
 448                 addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
 449 #if 0
 450                 printf ("Command \"%s\": 0x%08lx => 0x%08lx\n",
 451                                 cmdtp->name, (ulong) (cmdtp->cmd), addr);
 452 #endif
 453                 cmdtp->cmd =
 454                         (int (*)(struct cmd_tbl_s *, int, int, char *[]))addr;
 455
 456                 addr = (ulong)(cmdtp->name) + gd->reloc_off;
 457                 cmdtp->name = (char *)addr;
 458
 459                 if (cmdtp->usage) {
 460                         addr = (ulong)(cmdtp->usage) + gd->reloc_off;
 461                         cmdtp->usage = (char *)addr;
 462                 }
 463 #ifdef  CFG_LONGHELP
 464                 if (cmdtp->help) {
 465                         addr = (ulong)(cmdtp->help) + gd->reloc_off;
 466                         cmdtp->help = (char *)addr;
 467                 }
 468 #endif
 469         }
 470         /* there are some other pointer constants we must deal with */
 471 #ifndef CFG_ENV_IS_NOWHERE
 472         env_name_spec += gd->reloc_off;
 473 #endif
 474
 475         WATCHDOG_RESET ();
 476
 477 #ifdef CONFIG_LOGBUFFER
 478         logbuff_init_ptrs ();
 479 #endif
 480 #ifdef CONFIG_POST
 481         post_output_backlog ();
 482         post_reloc ();
 483 #endif
 484         WATCHDOG_RESET();
 485
 486 #if 0
 487         /* instruction cache enabled in cpu_init_f() for faster relocation */
 488         icache_enable ();       /* it's time to enable the instruction cache */
 489 #endif
 490
 491         /*
 492          * Setup trap handlers
 493          */
 494         trap_init (0);
 495
 496 #if !defined(CFG_NO_FLASH)
 497         puts ("FLASH: ");
 498
 499         if ((flash_size = flash_init ()) > 0) {
 500 # ifdef CFG_FLASH_CHECKSUM
 501                 print_size (flash_size, "");
 502                 /*
 503                  * Compute and print flash CRC if flashchecksum is set to 'y'
 504                  *
 505                  * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX
 506                  */
 507                 s = getenv ("flashchecksum");
 508                 if (s && (*s == 'y')) {
 509                         printf ("  CRC: %08lX",
 510                                         crc32 (0,
 511                                                    (const unsigned char *) CFG_FLASH_BASE,
 512                                                    flash_size)
 513                                         );
 514                 }
 515                 putc ('\n');
 516 # else  /* !CFG_FLASH_CHECKSUM */
 517                 print_size (flash_size, "\n");
 518 # endif /* CFG_FLASH_CHECKSUM */
 519         } else {
 520                 puts (failed);
 521                 hang ();
 522         }
 523
 524         bd->bi_flashstart = CFG_FLASH_BASE;     /* update start of FLASH memory    */
 525         bd->bi_flashsize = flash_size;  /* size of FLASH memory (final value) */
 526         bd->bi_flashoffset = 0;
 527 #else   /* CFG_NO_FLASH */
 528         bd->bi_flashsize = 0;
 529         bd->bi_flashstart = 0;
 530         bd->bi_flashoffset = 0;
 531 #endif /* !CFG_NO_FLASH */
 532
 533         WATCHDOG_RESET ();
 534
 535         /* initialize higher level parts of CPU like time base and timers */
 536         cpu_init_r ();
 537
 538         WATCHDOG_RESET ();
 539
 540         /* initialize malloc() area */
 541         mem_malloc_init ();
 542         malloc_bin_reloc ();
 543
 544 #ifdef CONFIG_SPI
 545 # if !defined(CFG_ENV_IS_IN_EEPROM)
 546         spi_init_f ();
 547 # endif
 548         spi_init_r ();
 549 #endif
 550
 551         /* relocate environment function pointers etc. */
 552         env_relocate ();
 553
 554         /*
 555          * Fill in missing fields of bd_info.
 556          * We do this here, where we have "normal" access to the
 557          * environment; we used to do this still running from ROM,
 558          * where had to use getenv_r(), which can be pretty slow when
 559          * the environment is in EEPROM.
 560          */
 561         s = getenv ("ethaddr");
 562         for (i = 0; i < 6; ++i) {
 563                 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
 564                 if (s)
 565                         s = (*e) ? e + 1 : e;
 566         }
 567
 568         /* IP Address */
 569         bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
 570
 571         WATCHDOG_RESET ();
 572
 573
 574         /** leave this here (after malloc(), environment and PCI are working) **/
 575         /* Initialize devices */
 576         devices_init ();
 577
 578         /* Initialize the jump table for applications */
 579         jumptable_init ();
 580
 581         /* Initialize the console (after the relocation and devices init) */
 582         console_init_r ();
 583
 584 #if defined(CONFIG_MISC_INIT_R)
 585         /* miscellaneous platform dependent initialisations */
 586         misc_init_r ();
 587 #endif
 588
 589 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
 590         WATCHDOG_RESET ();
 591         puts ("KGDB:  ");
 592         kgdb_init ();
 593 #endif
 594
 595         debug ("U-Boot relocated to %08lx\n", dest_addr);
 596
 597         /*
 598          * Enable Interrupts
 599          */
 600         interrupt_init ();
 601
 602         /* Must happen after interrupts are initialized since
 603          * an irq handler gets installed
 604          */
 605         timer_init();
 606
 607 #ifdef CONFIG_SERIAL_SOFTWARE_FIFO
 608         serial_buffered_init();
 609 #endif
 610
 611 #ifdef CONFIG_STATUS_LED
 612         status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
 613 #endif
 614
 615         udelay (20);
 616
 617         set_timer (0);
 618
 619         /* Insert function pointers now that we have relocated the code */
 620
 621         /* Initialize from environment */
 622         if ((s = getenv ("loadaddr")) != NULL) {
 623                 load_addr = simple_strtoul (s, NULL, 16);
 624         }
 625 #if (CONFIG_COMMANDS & CFG_CMD_NET)
 626         if ((s = getenv ("bootfile")) != NULL) {
 627                 copy_filename (BootFile, s, sizeof (BootFile));
 628         }
 629 #endif /* CFG_CMD_NET */
 630
 631         WATCHDOG_RESET ();
 632
 633 #if (CONFIG_COMMANDS & CFG_CMD_DOC)
 634         WATCHDOG_RESET ();
 635         puts ("DOC:   ");
 636         doc_init ();
 637 #endif
 638
 639 #if (CONFIG_COMMANDS & CFG_CMD_NAND)
 640         WATCHDOG_RESET ();
 641         puts ("NAND:");
 642         nand_init();            /* go init the NAND */
 643 #endif
 644
 645 #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(FEC_ENET)
 646         WATCHDOG_RESET();
 647         eth_init(bd);
 648 #endif
 649
 650 #ifdef CONFIG_POST
 651         post_run (NULL, POST_RAM | post_bootmode_get(0));
 652 #endif
 653
 654 #ifdef CONFIG_LAST_STAGE_INIT
 655         WATCHDOG_RESET ();
 656         /*
 657          * Some parts can be only initialized if all others (like
 658          * Interrupts) are up and running (i.e. the PC-style ISA
 659          * keyboard).
 660          */
 661         last_stage_init ();
 662 #endif
 663
 664 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
 665         WATCHDOG_RESET ();
 666         bedbug_init ();
 667 #endif
 668
 669 #if defined(CONFIG_PRAM) || defined(CONFIG_LOGBUFFER)
 670         /*
 671          * Export available size of memory for Linux,
 672          * taking into account the protected RAM at top of memory
 673          */
 674         {
 675                 ulong pram;
 676                 uchar memsz[32];
 677 #ifdef CONFIG_PRAM
 678                 char *s;
 679
 680                 if ((s = getenv ("pram")) != NULL) {
 681                         pram = simple_strtoul (s, NULL, 10);
 682                 } else {
 683                         pram = CONFIG_PRAM;
 684                 }
 685 #else
 686                 pram=0;
 687 #endif
 688 #ifdef CONFIG_LOGBUFFER
 689                 /* Also take the logbuffer into account (pram is in kB) */
 690                 pram += (LOGBUFF_LEN+LOGBUFF_OVERHEAD)/1024;
 691 #endif
 692                 sprintf (memsz, "%ldk", (bd->bi_memsize / 1024) - pram);
 693                 setenv ("mem", memsz);
 694         }
 695 #endif
 696
 697 #ifdef CONFIG_MODEM_SUPPORT
 698  {
 699          extern int do_mdm_init;
 700          do_mdm_init = gd->do_mdm_init;
 701  }
 702 #endif
 703
 704 #ifdef CONFIG_WATCHDOG
 705         /* disable watchdog if environment is set */
 706         if ((s = getenv ("watchdog")) != NULL) {
 707                 if (strncmp (s, "off", 3) == 0) {
 708                         WATCHDOG_DISABLE ();
 709                 }
 710         }
 711 #endif /* CONFIG_WATCHDOG*/
 712
 713
 714         /* Initialization complete - start the monitor */
 715
 716         /* main_loop() can return to retry autoboot, if so just run it again. */
 717         for (;;) {
 718                 WATCHDOG_RESET ();
 719                 main_loop ();
 720         }
 721
 722         /* NOTREACHED - no way out of command loop except booting */
 723 }
 724
 725
 726 void hang(void)
 727 {
 728         puts ("### ERROR ### Please RESET the board ###\n");
 729         for (;;);
 730 }