arch/m68k/lib/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 <stdio_dev.h>
  32
  33 #include <asm/immap.h>
  34
  35 #if defined(CONFIG_CMD_IDE)
  36 #include <ide.h>
  37 #endif
  38 #if defined(CONFIG_CMD_SCSI)
  39 #include <scsi.h>
  40 #endif
  41 #if defined(CONFIG_CMD_KGDB)
  42 #include <kgdb.h>
  43 #endif
  44 #ifdef CONFIG_STATUS_LED
  45 #include <status_led.h>
  46 #endif
  47 #include <net.h>
  48 #include <serial.h>
  49 #if defined(CONFIG_CMD_BEDBUG)
  50 #include <cmd_bedbug.h>
  51 #endif
  52 #ifdef CONFIG_SYS_ALLOC_DPRAM
  53 #include <commproc.h>
  54 #endif
  55 #include <version.h>
  56
  57 #if defined(CONFIG_HARD_I2C) || \
  58     defined(CONFIG_SOFT_I2C)
  59 #include <i2c.h>
  60 #endif
  61
  62 #ifdef CONFIG_CMD_SPI
  63 #include <spi.h>
  64 #endif
  65
  66 #ifdef CONFIG_BITBANGMII
  67 #include <miiphy.h>
  68 #endif
  69
  70 #include <nand.h>
  71
  72 DECLARE_GLOBAL_DATA_PTR;
  73
  74 static char *failed = "*** failed ***\n";
  75
  76 #ifdef  CONFIG_PCU_E
  77 extern flash_info_t flash_info[];
  78 #endif
  79
  80 #include <environment.h>
  81
  82 #if ( ((CONFIG_ENV_ADDR+CONFIG_ENV_SIZE) < CONFIG_SYS_MONITOR_BASE) || \
  83       (CONFIG_ENV_ADDR >= (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)) ) || \
  84     defined(CONFIG_ENV_IS_IN_NVRAM)
  85 #define TOTAL_MALLOC_LEN        (CONFIG_SYS_MALLOC_LEN + CONFIG_ENV_SIZE)
  86 #else
  87 #define TOTAL_MALLOC_LEN        CONFIG_SYS_MALLOC_LEN
  88 #endif
  89
  90 extern ulong __init_end;
  91 extern ulong _end;
  92
  93 extern  void timer_init(void);
  94
  95 #if defined(CONFIG_WATCHDOG)
  96 # define INIT_FUNC_WATCHDOG_INIT        watchdog_init,
  97 # define WATCHDOG_DISABLE               watchdog_disable
  98
  99 extern int watchdog_init(void);
 100 extern int watchdog_disable(void);
 101 #else
 102 # define INIT_FUNC_WATCHDOG_INIT        /* undef */
 103 # define WATCHDOG_DISABLE               /* undef */
 104 #endif /* CONFIG_WATCHDOG */
 105
 106 ulong monitor_flash_len;
 107
 108 /************************************************************************
 109  * Utilities                                                            *
 110  ************************************************************************
 111  */
 112
 113 /*
 114  * All attempts to come up with a "common" initialization sequence
 115  * that works for all boards and architectures failed: some of the
 116  * requirements are just _too_ different. To get rid of the resulting
 117  * mess of board dependend #ifdef'ed code we now make the whole
 118  * initialization sequence configurable to the user.
 119  *
 120  * The requirements for any new initalization function is simple: it
 121  * receives a pointer to the "global data" structure as it's only
 122  * argument, and returns an integer return code, where 0 means
 123  * "continue" and != 0 means "fatal error, hang the system".
 124  */
 125 typedef int (init_fnc_t) (void);
 126
 127 /************************************************************************
 128  * Init Utilities
 129  ************************************************************************
 130  * Some of this code should be moved into the core functions,
 131  * but let's get it working (again) first...
 132  */
 133
 134 static int init_baudrate (void)
 135 {
 136         char tmp[64];   /* long enough for environment variables */
 137         int i = getenv_f("baudrate", tmp, sizeof (tmp));
 138
 139         gd->baudrate = (i > 0)
 140                         ? (int) simple_strtoul (tmp, NULL, 10)
 141                         : CONFIG_BAUDRATE;
 142         return (0);
 143 }
 144
 145 /***********************************************************************/
 146
 147 static int init_func_ram (void)
 148 {
 149         int board_type = 0;     /* use dummy arg */
 150         puts ("DRAM:  ");
 151
 152         if ((gd->ram_size = initdram (board_type)) > 0) {
 153                 print_size (gd->ram_size, "\n");
 154                 return (0);
 155         }
 156         puts (failed);
 157         return (1);
 158 }
 159
 160 /***********************************************************************/
 161
 162 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 163 static int init_func_i2c (void)
 164 {
 165         puts ("I2C:   ");
 166         i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 167         puts ("ready\n");
 168         return (0);
 169 }
 170 #endif
 171
 172 #if defined(CONFIG_HARD_SPI)
 173 static int init_func_spi (void)
 174 {
 175         puts ("SPI:   ");
 176         spi_init ();
 177         puts ("ready\n");
 178         return (0);
 179 }
 180 #endif
 181
 182 /***********************************************************************/
 183
 184 /************************************************************************
 185  * Initialization sequence                                              *
 186  ************************************************************************
 187  */
 188
 189 init_fnc_t *init_sequence[] = {
 190         get_clocks,
 191         env_init,
 192         init_baudrate,
 193         serial_init,
 194         console_init_f,
 195         display_options,
 196         checkcpu,
 197         checkboard,
 198 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 199         init_func_i2c,
 200 #endif
 201 #if defined(CONFIG_HARD_SPI)
 202         init_func_spi,
 203 #endif
 204         init_func_ram,
 205 #if defined(CONFIG_SYS_DRAM_TEST)
 206         testdram,
 207 #endif /* CONFIG_SYS_DRAM_TEST */
 208         INIT_FUNC_WATCHDOG_INIT
 209         NULL,                   /* Terminate this list */
 210 };
 211
 212
 213 /************************************************************************
 214  *
 215  * This is the first part of the initialization sequence that is
 216  * implemented in C, but still running from ROM.
 217  *
 218  * The main purpose is to provide a (serial) console interface as
 219  * soon as possible (so we can see any error messages), and to
 220  * initialize the RAM so that we can relocate the monitor code to
 221  * RAM.
 222  *
 223  * Be aware of the restrictions: global data is read-only, BSS is not
 224  * initialized, and stack space is limited to a few kB.
 225  *
 226  ************************************************************************
 227  */
 228
 229 void
 230 board_init_f (ulong bootflag)
 231 {
 232         bd_t *bd;
 233         ulong len, addr, addr_sp;
 234         ulong *paddr;
 235         gd_t *id;
 236         init_fnc_t **init_fnc_ptr;
 237 #ifdef CONFIG_PRAM
 238         int i;
 239         ulong reg;
 240         char tmp[64];           /* long enough for environment variables */
 241 #endif
 242
 243         /* Pointer is writable since we allocated a register for it */
 244         gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
 245         /* compiler optimization barrier needed for GCC >= 3.4 */
 246         __asm__ __volatile__("": : :"memory");
 247
 248         /* Clear initial global data */
 249         memset ((void *) gd, 0, sizeof (gd_t));
 250
 251         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 252                 if ((*init_fnc_ptr)() != 0) {
 253                         hang ();
 254                 }
 255         }
 256
 257         /*
 258          * Now that we have DRAM mapped and working, we can
 259          * relocate the code and continue running from DRAM.
 260          *
 261          * Reserve memory at end of RAM for (top down in that order):
 262          *      - protected RAM
 263          *      - LCD framebuffer
 264          *      - monitor code
 265          *      - board info struct
 266          */
 267         len = (ulong)&_end - CONFIG_SYS_MONITOR_BASE;
 268
 269         addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size;
 270
 271 #ifdef CONFIG_LOGBUFFER
 272         /* reserve kernel log buffer */
 273         addr -= (LOGBUFF_RESERVE);
 274         debug ("Reserving %dk for kernel logbuffer at %08lx\n", LOGBUFF_LEN, addr);
 275 #endif
 276
 277 #ifdef CONFIG_PRAM
 278         /*
 279          * reserve protected RAM
 280          */
 281         i = getenv_f("pram", tmp, sizeof (tmp));
 282         reg = (i > 0) ? simple_strtoul (tmp, NULL, 10) : CONFIG_PRAM;
 283         addr -= (reg << 10);            /* size is in kB */
 284         debug ("Reserving %ldk for protected RAM at %08lx\n", reg, addr);
 285 #endif /* CONFIG_PRAM */
 286
 287         /* round down to next 4 kB limit */
 288         addr &= ~(4096 - 1);
 289         debug ("Top of RAM usable for U-Boot at: %08lx\n", addr);
 290
 291 #ifdef CONFIG_LCD
 292         /* reserve memory for LCD display (always full pages) */
 293         addr = lcd_setmem (addr);
 294         gd->fb_base = addr;
 295 #endif /* CONFIG_LCD */
 296
 297         /*
 298          * reserve memory for U-Boot code, data & bss
 299          * round down to next 4 kB limit
 300          */
 301         addr -= len;
 302         addr &= ~(4096 - 1);
 303
 304         debug ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
 305
 306         /*
 307          * reserve memory for malloc() arena
 308          */
 309         addr_sp = addr - TOTAL_MALLOC_LEN;
 310         debug ("Reserving %dk for malloc() at: %08lx\n",
 311                         TOTAL_MALLOC_LEN >> 10, addr_sp);
 312
 313         /*
 314          * (permanently) allocate a Board Info struct
 315          * and a permanent copy of the "global" data
 316          */
 317         addr_sp -= sizeof (bd_t);
 318         bd = (bd_t *) addr_sp;
 319         gd->bd = bd;
 320         debug ("Reserving %zu Bytes for Board Info at: %08lx\n",
 321                         sizeof (bd_t), addr_sp);
 322         addr_sp -= sizeof (gd_t);
 323         id = (gd_t *) addr_sp;
 324         debug ("Reserving %zu Bytes for Global Data at: %08lx\n",
 325                         sizeof (gd_t), addr_sp);
 326
 327         /* Reserve memory for boot params. */
 328         addr_sp -= CONFIG_SYS_BOOTPARAMS_LEN;
 329         bd->bi_boot_params = addr_sp;
 330         debug ("Reserving %dk for boot parameters at: %08lx\n",
 331                         CONFIG_SYS_BOOTPARAMS_LEN >> 10, addr_sp);
 332
 333         /*
 334          * Finally, we set up a new (bigger) stack.
 335          *
 336          * Leave some safety gap for SP, force alignment on 16 byte boundary
 337          * Clear initial stack frame
 338          */
 339         addr_sp -= 16;
 340         addr_sp &= ~0xF;
 341
 342         paddr = (ulong *)addr_sp;
 343         *paddr-- = 0;
 344         *paddr-- = 0;
 345         addr_sp = (ulong)paddr;
 346
 347         debug ("Stack Pointer at: %08lx\n", addr_sp);
 348
 349         /*
 350          * Save local variables to board info struct
 351          */
 352         bd->bi_memstart  = CONFIG_SYS_SDRAM_BASE;       /* start of  DRAM memory      */
 353         bd->bi_memsize   = gd->ram_size;        /* size  of  DRAM memory in bytes */
 354 #ifdef CONFIG_SYS_INIT_RAM_ADDR
 355         bd->bi_sramstart = CONFIG_SYS_INIT_RAM_ADDR;    /* start of  SRAM memory        */
 356         bd->bi_sramsize  = CONFIG_SYS_INIT_RAM_END;     /* size  of  SRAM memory        */
 357 #endif
 358         bd->bi_mbar_base = CONFIG_SYS_MBAR;             /* base of internal registers */
 359
 360         bd->bi_bootflags = bootflag;            /* boot / reboot flag (for LynxOS)    */
 361
 362         WATCHDOG_RESET ();
 363         bd->bi_intfreq = gd->cpu_clk;   /* Internal Freq, in Hz */
 364         bd->bi_busfreq = gd->bus_clk;   /* Bus Freq,      in Hz */
 365 #ifdef CONFIG_PCI
 366         bd->bi_pcifreq = gd->pci_clk;           /* PCI Freq in Hz */
 367 #endif
 368 #ifdef CONFIG_EXTRA_CLOCK
 369         bd->bi_inpfreq = gd->inp_clk;           /* input Freq in Hz */
 370         bd->bi_vcofreq = gd->vco_clk;           /* vco Freq in Hz */
 371         bd->bi_flbfreq = gd->flb_clk;           /* flexbus Freq in Hz */
 372 #endif
 373         bd->bi_baudrate = gd->baudrate; /* Console Baudrate     */
 374
 375 #ifdef CONFIG_SYS_EXTBDINFO
 376         strncpy (bd->bi_s_version, "1.2", sizeof (bd->bi_s_version));
 377         strncpy (bd->bi_r_version, U_BOOT_VERSION, sizeof (bd->bi_r_version));
 378 #endif
 379
 380         WATCHDOG_RESET ();
 381
 382 #ifdef CONFIG_POST
 383         post_bootmode_init();
 384         post_run (NULL, POST_ROM | post_bootmode_get(0));
 385 #endif
 386
 387         WATCHDOG_RESET();
 388
 389         memcpy (id, (void *)gd, sizeof (gd_t));
 390
 391         debug ("Start relocate of code from %08x to %08lx\n", CONFIG_SYS_MONITOR_BASE, addr);
 392         relocate_code (addr_sp, id, addr);
 393
 394         /* NOTREACHED - jump_to_ram() does not return */
 395 }
 396
 397 /************************************************************************
 398  *
 399  * This is the next part if the initialization sequence: we are now
 400  * running from RAM and have a "normal" C environment, i. e. global
 401  * data can be written, BSS has been cleared, the stack size in not
 402  * that critical any more, etc.
 403  *
 404  ************************************************************************
 405  */
 406 void board_init_r (gd_t *id, ulong dest_addr)
 407 {
 408         cmd_tbl_t *cmdtp;
 409         char *s;
 410         bd_t *bd;
 411         extern void malloc_bin_reloc (void);
 412
 413 #ifndef CONFIG_ENV_IS_NOWHERE
 414         extern char * env_name_spec;
 415 #endif
 416 #ifndef CONFIG_SYS_NO_FLASH
 417         ulong flash_size;
 418 #endif
 419         gd = id;                /* initialize RAM version of global data */
 420         bd = gd->bd;
 421
 422         gd->flags |= GD_FLG_RELOC;      /* tell others: relocation done */
 423
 424 #ifdef CONFIG_SERIAL_MULTI
 425         serial_initialize();
 426 #endif
 427
 428         debug ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
 429
 430         WATCHDOG_RESET ();
 431
 432         gd->reloc_off =  dest_addr - CONFIG_SYS_MONITOR_BASE;
 433
 434         monitor_flash_len = (ulong)&__init_end - dest_addr;
 435
 436 #if !defined(CONFIG_RELOC_FIXUP_WORKS)
 437         /*
 438          * We have to relocate the command table manually
 439          */
 440         fixup_cmdtable(&__u_boot_cmd_start,
 441                 (ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start));
 442 #endif /* !defined(CONFIG_RELOC_FIXUP_WORKS) */
 443
 444         /* there are some other pointer constants we must deal with */
 445 #ifndef CONFIG_ENV_IS_NOWHERE
 446         env_name_spec += gd->reloc_off;
 447 #endif
 448
 449         WATCHDOG_RESET ();
 450
 451 #ifdef CONFIG_LOGBUFFER
 452         logbuff_init_ptrs ();
 453 #endif
 454 #ifdef CONFIG_POST
 455         post_output_backlog ();
 456         post_reloc ();
 457 #endif
 458         WATCHDOG_RESET();
 459
 460 #if 0
 461         /* instruction cache enabled in cpu_init_f() for faster relocation */
 462         icache_enable ();       /* it's time to enable the instruction cache */
 463 #endif
 464
 465         /*
 466          * Setup trap handlers
 467          */
 468         trap_init (CONFIG_SYS_SDRAM_BASE);
 469
 470         /* The Malloc area is immediately below the monitor copy in DRAM */
 471         mem_malloc_init (CONFIG_SYS_MONITOR_BASE + gd->reloc_off -
 472                         TOTAL_MALLOC_LEN, TOTAL_MALLOC_LEN);
 473         malloc_bin_reloc ();
 474
 475 #if !defined(CONFIG_SYS_NO_FLASH)
 476         puts ("FLASH: ");
 477
 478         if ((flash_size = flash_init ()) > 0) {
 479 # ifdef CONFIG_SYS_FLASH_CHECKSUM
 480                 print_size (flash_size, "");
 481                 /*
 482                  * Compute and print flash CRC if flashchecksum is set to 'y'
 483                  *
 484                  * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX
 485                  */
 486                 s = getenv ("flashchecksum");
 487                 if (s && (*s == 'y')) {
 488                         printf ("  CRC: %08X",
 489                                         crc32 (0,
 490                                                    (const unsigned char *) CONFIG_SYS_FLASH_BASE,
 491                                                    flash_size)
 492                                         );
 493                 }
 494                 putc ('\n');
 495 # else  /* !CONFIG_SYS_FLASH_CHECKSUM */
 496                 print_size (flash_size, "\n");
 497 # endif /* CONFIG_SYS_FLASH_CHECKSUM */
 498         } else {
 499                 puts (failed);
 500                 hang ();
 501         }
 502
 503         bd->bi_flashstart = CONFIG_SYS_FLASH_BASE;      /* update start of FLASH memory    */
 504         bd->bi_flashsize = flash_size;  /* size of FLASH memory (final value) */
 505         bd->bi_flashoffset = 0;
 506 #else   /* CONFIG_SYS_NO_FLASH */
 507         bd->bi_flashsize = 0;
 508         bd->bi_flashstart = 0;
 509         bd->bi_flashoffset = 0;
 510 #endif /* !CONFIG_SYS_NO_FLASH */
 511
 512         WATCHDOG_RESET ();
 513
 514         /* initialize higher level parts of CPU like time base and timers */
 515         cpu_init_r ();
 516
 517         WATCHDOG_RESET ();
 518
 519 #ifdef CONFIG_SPI
 520 # if !defined(CONFIG_ENV_IS_IN_EEPROM)
 521         spi_init_f ();
 522 # endif
 523         spi_init_r ();
 524 #endif
 525
 526         /* relocate environment function pointers etc. */
 527         env_relocate ();
 528
 529         /*
 530          * Fill in missing fields of bd_info.
 531          * We do this here, where we have "normal" access to the
 532          * environment; we used to do this still running from ROM,
 533          * where had to use getenv_f(), which can be pretty slow when
 534          * the environment is in EEPROM.
 535          */
 536         bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
 537
 538         WATCHDOG_RESET ();
 539
 540 #if defined(CONFIG_PCI)
 541         /*
 542          * Do pci configuration
 543          */
 544         pci_init ();
 545 #endif
 546
 547         /** leave this here (after malloc(), environment and PCI are working) **/
 548         /* Initialize stdio devices */
 549         stdio_init ();
 550
 551         /* Initialize the jump table for applications */
 552         jumptable_init ();
 553
 554         /* Initialize the console (after the relocation and devices init) */
 555         console_init_r ();
 556
 557 #if defined(CONFIG_MISC_INIT_R)
 558         /* miscellaneous platform dependent initialisations */
 559         misc_init_r ();
 560 #endif
 561
 562 #if defined(CONFIG_CMD_KGDB)
 563         WATCHDOG_RESET ();
 564         puts ("KGDB:  ");
 565         kgdb_init ();
 566 #endif
 567
 568         debug ("U-Boot relocated to %08lx\n", dest_addr);
 569
 570         /*
 571          * Enable Interrupts
 572          */
 573         interrupt_init ();
 574
 575         /* Must happen after interrupts are initialized since
 576          * an irq handler gets installed
 577          */
 578         timer_init();
 579
 580 #ifdef CONFIG_SERIAL_SOFTWARE_FIFO
 581         serial_buffered_init();
 582 #endif
 583
 584 #ifdef CONFIG_STATUS_LED
 585         status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
 586 #endif
 587
 588         udelay (20);
 589
 590         set_timer (0);
 591
 592         /* Insert function pointers now that we have relocated the code */
 593
 594         /* Initialize from environment */
 595         if ((s = getenv ("loadaddr")) != NULL) {
 596                 load_addr = simple_strtoul (s, NULL, 16);
 597         }
 598 #if defined(CONFIG_CMD_NET)
 599         if ((s = getenv ("bootfile")) != NULL) {
 600                 copy_filename (BootFile, s, sizeof (BootFile));
 601         }
 602 #endif
 603
 604         WATCHDOG_RESET ();
 605
 606 #if defined(CONFIG_CMD_DOC)
 607         WATCHDOG_RESET ();
 608         puts ("DOC:   ");
 609         doc_init ();
 610 #endif
 611
 612 #if defined(CONFIG_CMD_NAND)
 613         WATCHDOG_RESET ();
 614         puts ("NAND:  ");
 615         nand_init();            /* go init the NAND */
 616 #endif
 617
 618 #ifdef CONFIG_BITBANGMII
 619         bb_miiphy_init();
 620 #endif
 621 #if defined(CONFIG_CMD_NET)
 622         WATCHDOG_RESET();
 623 #if defined(FEC_ENET)
 624         eth_init(bd);
 625 #endif
 626 #if defined(CONFIG_NET_MULTI)
 627         puts ("Net:   ");
 628         eth_initialize (bd);
 629 #endif
 630 #endif
 631
 632 #ifdef CONFIG_POST
 633         post_run (NULL, POST_RAM | post_bootmode_get(0));
 634 #endif
 635
 636 #if defined(CONFIG_CMD_PCMCIA) \
 637     && !defined(CONFIG_CMD_IDE)
 638         WATCHDOG_RESET ();
 639         puts ("PCMCIA:");
 640         pcmcia_init ();
 641 #endif
 642
 643 #if defined(CONFIG_CMD_IDE)
 644         WATCHDOG_RESET ();
 645         puts ("IDE:   ");
 646         ide_init ();
 647 #endif
 648
 649 #ifdef CONFIG_LAST_STAGE_INIT
 650         WATCHDOG_RESET ();
 651         /*
 652          * Some parts can be only initialized if all others (like
 653          * Interrupts) are up and running (i.e. the PC-style ISA
 654          * keyboard).
 655          */
 656         last_stage_init ();
 657 #endif
 658
 659 #if defined(CONFIG_CMD_BEDBUG)
 660         WATCHDOG_RESET ();
 661         bedbug_init ();
 662 #endif
 663
 664 #if defined(CONFIG_PRAM) || defined(CONFIG_LOGBUFFER)
 665         /*
 666          * Export available size of memory for Linux,
 667          * taking into account the protected RAM at top of memory
 668          */
 669         {
 670                 ulong pram;
 671                 char memsz[32];
 672 #ifdef CONFIG_PRAM
 673                 char *s;
 674
 675                 if ((s = getenv ("pram")) != NULL) {
 676                         pram = simple_strtoul (s, NULL, 10);
 677                 } else {
 678                         pram = CONFIG_PRAM;
 679                 }
 680 #else
 681                 pram=0;
 682 #endif
 683 #ifdef CONFIG_LOGBUFFER
 684                 /* Also take the logbuffer into account (pram is in kB) */
 685                 pram += (LOGBUFF_LEN+LOGBUFF_OVERHEAD)/1024;
 686 #endif
 687                 sprintf (memsz, "%ldk", (bd->bi_memsize / 1024) - pram);
 688                 setenv ("mem", memsz);
 689         }
 690 #endif
 691
 692 #ifdef CONFIG_MODEM_SUPPORT
 693  {
 694          extern int do_mdm_init;
 695          do_mdm_init = gd->do_mdm_init;
 696  }
 697 #endif
 698
 699 #ifdef CONFIG_WATCHDOG
 700         /* disable watchdog if environment is set */
 701         if ((s = getenv ("watchdog")) != NULL) {
 702                 if (strncmp (s, "off", 3) == 0) {
 703                         WATCHDOG_DISABLE ();
 704                 }
 705         }
 706 #endif /* CONFIG_WATCHDOG*/
 707
 708
 709         /* Initialization complete - start the monitor */
 710
 711         /* main_loop() can return to retry autoboot, if so just run it again. */
 712         for (;;) {
 713                 WATCHDOG_RESET ();
 714                 main_loop ();
 715         }
 716
 717         /* NOTREACHED - no way out of command loop except booting */
 718 }
 719
 720
 721 void hang(void)
 722 {
 723         puts ("### ERROR ### Please RESET the board ###\n");
 724         for (;;);
 725 }