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