arch/arm/lib/board.c

   1 /*
   2  * (C) Copyright 2002-2006
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2002
   6  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7  * Marius Groeger <mgroeger@sysgo.de>
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  */
  27
  28 /*
  29  * To match the U-Boot user interface on ARM platforms to the U-Boot
  30  * standard (as on PPC platforms), some messages with debug character
  31  * are removed from the default U-Boot build.
  32  *
  33  * Define DEBUG here if you want additional info as shown below
  34  * printed upon startup:
  35  *
  36  * U-Boot code: 00F00000 -> 00F3C774  BSS: -> 00FC3274
  37  * IRQ Stack: 00ebff7c
  38  * FIQ Stack: 00ebef7c
  39  */
  40
  41 #include <common.h>
  42 #include <command.h>
  43 #include <malloc.h>
  44 #include <stdio_dev.h>
  45 #include <version.h>
  46 #include <net.h>
  47 #include <serial.h>
  48 #include <nand.h>
  49 #include <onenand_uboot.h>
  50 #include <mmc.h>
  51 #include <libfdt.h>
  52 #include <fdtdec.h>
  53 #include <post.h>
  54 #include <logbuff.h>
  55
  56 #ifdef CONFIG_BITBANGMII
  57 #include <miiphy.h>
  58 #endif
  59
  60 DECLARE_GLOBAL_DATA_PTR;
  61
  62 ulong monitor_flash_len;
  63
  64 #ifdef CONFIG_HAS_DATAFLASH
  65 extern int  AT91F_DataflashInit(void);
  66 extern void dataflash_print_info(void);
  67 #endif
  68
  69 #if defined(CONFIG_HARD_I2C) || \
  70     defined(CONFIG_SOFT_I2C)
  71 #include <i2c.h>
  72 #endif
  73
  74 /************************************************************************
  75  * Coloured LED functionality
  76  ************************************************************************
  77  * May be supplied by boards if desired
  78  */
  79 inline void __coloured_LED_init(void) {}
  80 void coloured_LED_init(void)
  81         __attribute__((weak, alias("__coloured_LED_init")));
  82 inline void __red_led_on(void) {}
  83 void red_led_on(void) __attribute__((weak, alias("__red_led_on")));
  84 inline void __red_led_off(void) {}
  85 void red_led_off(void) __attribute__((weak, alias("__red_led_off")));
  86 inline void __green_led_on(void) {}
  87 void green_led_on(void) __attribute__((weak, alias("__green_led_on")));
  88 inline void __green_led_off(void) {}
  89 void green_led_off(void) __attribute__((weak, alias("__green_led_off")));
  90 inline void __yellow_led_on(void) {}
  91 void yellow_led_on(void) __attribute__((weak, alias("__yellow_led_on")));
  92 inline void __yellow_led_off(void) {}
  93 void yellow_led_off(void) __attribute__((weak, alias("__yellow_led_off")));
  94 inline void __blue_led_on(void) {}
  95 void blue_led_on(void) __attribute__((weak, alias("__blue_led_on")));
  96 inline void __blue_led_off(void) {}
  97 void blue_led_off(void) __attribute__((weak, alias("__blue_led_off")));
  98
  99 /*
 100  ************************************************************************
 101  * Init Utilities                                                       *
 102  ************************************************************************
 103  * Some of this code should be moved into the core functions,
 104  * or dropped completely,
 105  * but let's get it working (again) first...
 106  */
 107
 108 #if defined(CONFIG_ARM_DCC) && !defined(CONFIG_BAUDRATE)
 109 #define CONFIG_BAUDRATE 115200
 110 #endif
 111
 112 static int init_baudrate(void)
 113 {
 114         gd->baudrate = getenv_ulong("baudrate", 10, CONFIG_BAUDRATE);
 115         return 0;
 116 }
 117
 118 static int display_banner(void)
 119 {
 120         printf("\n\n%s\n\n", version_string);
 121         debug("U-Boot code: %08lX -> %08lX  BSS: -> %08lX\n",
 122                _TEXT_BASE,
 123                _bss_start_ofs + _TEXT_BASE, _bss_end_ofs + _TEXT_BASE);
 124 #ifdef CONFIG_MODEM_SUPPORT
 125         debug("Modem Support enabled\n");
 126 #endif
 127 #ifdef CONFIG_USE_IRQ
 128         debug("IRQ Stack: %08lx\n", IRQ_STACK_START);
 129         debug("FIQ Stack: %08lx\n", FIQ_STACK_START);
 130 #endif
 131
 132         return (0);
 133 }
 134
 135 /*
 136  * WARNING: this code looks "cleaner" than the PowerPC version, but
 137  * has the disadvantage that you either get nothing, or everything.
 138  * On PowerPC, you might see "DRAM: " before the system hangs - which
 139  * gives a simple yet clear indication which part of the
 140  * initialization if failing.
 141  */
 142 static int display_dram_config(void)
 143 {
 144         int i;
 145
 146 #ifdef DEBUG
 147         puts("RAM Configuration:\n");
 148
 149         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 150                 printf("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
 151                 print_size(gd->bd->bi_dram[i].size, "\n");
 152         }
 153 #else
 154         ulong size = 0;
 155
 156         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
 157                 size += gd->bd->bi_dram[i].size;
 158
 159         puts("DRAM:  ");
 160         print_size(size, "\n");
 161 #endif
 162
 163         return (0);
 164 }
 165
 166 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 167 static int init_func_i2c(void)
 168 {
 169         puts("I2C:   ");
 170         i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 171         puts("ready\n");
 172         return (0);
 173 }
 174 #endif
 175
 176 #if defined(CONFIG_CMD_PCI) || defined (CONFIG_PCI)
 177 #include <pci.h>
 178 static int arm_pci_init(void)
 179 {
 180         pci_init();
 181         return 0;
 182 }
 183 #endif /* CONFIG_CMD_PCI || CONFIG_PCI */
 184
 185 /*
 186  * Breathe some life into the board...
 187  *
 188  * Initialize a serial port as console, and carry out some hardware
 189  * tests.
 190  *
 191  * The first part of initialization is running from Flash memory;
 192  * its main purpose is to initialize the RAM so that we
 193  * can relocate the monitor code to RAM.
 194  */
 195
 196 /*
 197  * All attempts to come up with a "common" initialization sequence
 198  * that works for all boards and architectures failed: some of the
 199  * requirements are just _too_ different. To get rid of the resulting
 200  * mess of board dependent #ifdef'ed code we now make the whole
 201  * initialization sequence configurable to the user.
 202  *
 203  * The requirements for any new initalization function is simple: it
 204  * receives a pointer to the "global data" structure as it's only
 205  * argument, and returns an integer return code, where 0 means
 206  * "continue" and != 0 means "fatal error, hang the system".
 207  */
 208 typedef int (init_fnc_t) (void);
 209
 210 int print_cpuinfo(void);
 211
 212 void __dram_init_banksize(void)
 213 {
 214         gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
 215         gd->bd->bi_dram[0].size =  gd->ram_size;
 216 }
 217 void dram_init_banksize(void)
 218         __attribute__((weak, alias("__dram_init_banksize")));
 219
 220 int __arch_cpu_init(void)
 221 {
 222         return 0;
 223 }
 224 int arch_cpu_init(void)
 225         __attribute__((weak, alias("__arch_cpu_init")));
 226
 227 init_fnc_t *init_sequence[] = {
 228         arch_cpu_init,          /* basic arch cpu dependent setup */
 229
 230 #if defined(CONFIG_BOARD_EARLY_INIT_F)
 231         board_early_init_f,
 232 #endif
 233 #ifdef CONFIG_OF_CONTROL
 234         fdtdec_check_fdt,
 235 #endif
 236         timer_init,             /* initialize timer */
 237 #ifdef CONFIG_BOARD_POSTCLK_INIT
 238         board_postclk_init,
 239 #endif
 240 #ifdef CONFIG_FSL_ESDHC
 241         get_clocks,
 242 #endif
 243         env_init,               /* initialize environment */
 244         init_baudrate,          /* initialze baudrate settings */
 245         serial_init,            /* serial communications setup */
 246         console_init_f,         /* stage 1 init of console */
 247         display_banner,         /* say that we are here */
 248 #if defined(CONFIG_DISPLAY_CPUINFO)
 249         print_cpuinfo,          /* display cpu info (and speed) */
 250 #endif
 251 #if defined(CONFIG_DISPLAY_BOARDINFO)
 252         checkboard,             /* display board info */
 253 #endif
 254 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 255         init_func_i2c,
 256 #endif
 257         dram_init,              /* configure available RAM banks */
 258         NULL,
 259 };
 260
 261 void board_init_f(ulong bootflag)
 262 {
 263         bd_t *bd;
 264         init_fnc_t **init_fnc_ptr;
 265         gd_t *id;
 266         ulong addr, addr_sp;
 267 #ifdef CONFIG_PRAM
 268         ulong reg;
 269 #endif
 270         void *new_fdt = NULL;
 271         size_t fdt_size = 0;
 272
 273         bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_F, "board_init_f");
 274
 275         /* Pointer is writable since we allocated a register for it */
 276         gd = (gd_t *) ((CONFIG_SYS_INIT_SP_ADDR) & ~0x07);
 277         /* compiler optimization barrier needed for GCC >= 3.4 */
 278         __asm__ __volatile__("": : :"memory");
 279
 280         memset((void *)gd, 0, sizeof(gd_t));
 281
 282         gd->mon_len = _bss_end_ofs;
 283 #ifdef CONFIG_OF_EMBED
 284         /* Get a pointer to the FDT */
 285         gd->fdt_blob = _binary_dt_dtb_start;
 286 #elif defined CONFIG_OF_SEPARATE
 287         /* FDT is at end of image */
 288         gd->fdt_blob = (void *)(_end_ofs + _TEXT_BASE);
 289 #endif
 290         /* Allow the early environment to override the fdt address */
 291         gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
 292                                                 (uintptr_t)gd->fdt_blob);
 293
 294         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 295                 if ((*init_fnc_ptr)() != 0) {
 296                         hang ();
 297                 }
 298         }
 299
 300 #ifdef CONFIG_OF_CONTROL
 301         /* For now, put this check after the console is ready */
 302         if (fdtdec_prepare_fdt()) {
 303                 panic("** CONFIG_OF_CONTROL defined but no FDT - please see "
 304                         "doc/README.fdt-control");
 305         }
 306 #endif
 307
 308         debug("monitor len: %08lX\n", gd->mon_len);
 309         /*
 310          * Ram is setup, size stored in gd !!
 311          */
 312         debug("ramsize: %08lX\n", gd->ram_size);
 313 #if defined(CONFIG_SYS_MEM_TOP_HIDE)
 314         /*
 315          * Subtract specified amount of memory to hide so that it won't
 316          * get "touched" at all by U-Boot. By fixing up gd->ram_size
 317          * the Linux kernel should now get passed the now "corrected"
 318          * memory size and won't touch it either. This should work
 319          * for arch/ppc and arch/powerpc. Only Linux board ports in
 320          * arch/powerpc with bootwrapper support, that recalculate the
 321          * memory size from the SDRAM controller setup will have to
 322          * get fixed.
 323          */
 324         gd->ram_size -= CONFIG_SYS_MEM_TOP_HIDE;
 325 #endif
 326
 327         addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size;
 328
 329 #ifdef CONFIG_LOGBUFFER
 330 #ifndef CONFIG_ALT_LB_ADDR
 331         /* reserve kernel log buffer */
 332         addr -= (LOGBUFF_RESERVE);
 333         debug("Reserving %dk for kernel logbuffer at %08lx\n", LOGBUFF_LEN,
 334                 addr);
 335 #endif
 336 #endif
 337
 338 #ifdef CONFIG_PRAM
 339         /*
 340          * reserve protected RAM
 341          */
 342         reg = getenv_ulong("pram", 10, CONFIG_PRAM);
 343         addr -= (reg << 10);            /* size is in kB */
 344         debug("Reserving %ldk for protected RAM at %08lx\n", reg, addr);
 345 #endif /* CONFIG_PRAM */
 346
 347 #if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
 348         /* reserve TLB table */
 349         addr -= (4096 * 4);
 350
 351         /* round down to next 64 kB limit */
 352         addr &= ~(0x10000 - 1);
 353
 354         gd->tlb_addr = addr;
 355         debug("TLB table at: %08lx\n", addr);
 356 #endif
 357
 358         /* round down to next 4 kB limit */
 359         addr &= ~(4096 - 1);
 360         debug("Top of RAM usable for U-Boot at: %08lx\n", addr);
 361
 362 #ifdef CONFIG_LCD
 363 #ifdef CONFIG_FB_ADDR
 364         gd->fb_base = CONFIG_FB_ADDR;
 365 #else
 366         /* reserve memory for LCD display (always full pages) */
 367         addr = lcd_setmem(addr);
 368         gd->fb_base = addr;
 369 #endif /* CONFIG_FB_ADDR */
 370 #endif /* CONFIG_LCD */
 371
 372         /*
 373          * reserve memory for U-Boot code, data & bss
 374          * round down to next 4 kB limit
 375          */
 376         addr -= gd->mon_len;
 377         addr &= ~(4096 - 1);
 378
 379         debug("Reserving %ldk for U-Boot at: %08lx\n", gd->mon_len >> 10, addr);
 380
 381 #ifndef CONFIG_SPL_BUILD
 382         /*
 383          * reserve memory for malloc() arena
 384          */
 385         addr_sp = addr - TOTAL_MALLOC_LEN;
 386         debug("Reserving %dk for malloc() at: %08lx\n",
 387                         TOTAL_MALLOC_LEN >> 10, addr_sp);
 388         /*
 389          * (permanently) allocate a Board Info struct
 390          * and a permanent copy of the "global" data
 391          */
 392         addr_sp -= sizeof (bd_t);
 393         bd = (bd_t *) addr_sp;
 394         gd->bd = bd;
 395         debug("Reserving %zu Bytes for Board Info at: %08lx\n",
 396                         sizeof (bd_t), addr_sp);
 397
 398 #ifdef CONFIG_MACH_TYPE
 399         gd->bd->bi_arch_number = CONFIG_MACH_TYPE; /* board id for Linux */
 400 #endif
 401
 402         addr_sp -= sizeof (gd_t);
 403         id = (gd_t *) addr_sp;
 404         debug("Reserving %zu Bytes for Global Data at: %08lx\n",
 405                         sizeof (gd_t), addr_sp);
 406
 407 #if defined(CONFIG_OF_SEPARATE) && defined(CONFIG_OF_CONTROL)
 408         /*
 409          * If the device tree is sitting immediate above our image then we
 410          * must relocate it. If it is embedded in the data section, then it
 411          * will be relocated with other data.
 412          */
 413         if (gd->fdt_blob) {
 414                 fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32);
 415
 416                 addr_sp -= fdt_size;
 417                 new_fdt = (void *)addr_sp;
 418                 debug("Reserving %zu Bytes for FDT at: %08lx\n",
 419                       fdt_size, addr_sp);
 420         }
 421 #endif
 422
 423         /* setup stackpointer for exeptions */
 424         gd->irq_sp = addr_sp;
 425 #ifdef CONFIG_USE_IRQ
 426         addr_sp -= (CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ);
 427         debug("Reserving %zu Bytes for IRQ stack at: %08lx\n",
 428                 CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ, addr_sp);
 429 #endif
 430         /* leave 3 words for abort-stack    */
 431         addr_sp -= 12;
 432
 433         /* 8-byte alignment for ABI compliance */
 434         addr_sp &= ~0x07;
 435 #else
 436         addr_sp += 128; /* leave 32 words for abort-stack   */
 437         gd->irq_sp = addr_sp;
 438 #endif
 439
 440         debug("New Stack Pointer is: %08lx\n", addr_sp);
 441
 442 #ifdef CONFIG_POST
 443         post_bootmode_init();
 444         post_run(NULL, POST_ROM | post_bootmode_get(0));
 445 #endif
 446
 447         gd->bd->bi_baudrate = gd->baudrate;
 448         /* Ram ist board specific, so move it to board code ... */
 449         dram_init_banksize();
 450         display_dram_config();  /* and display it */
 451
 452         gd->relocaddr = addr;
 453         gd->start_addr_sp = addr_sp;
 454         gd->reloc_off = addr - _TEXT_BASE;
 455         debug("relocation Offset is: %08lx\n", gd->reloc_off);
 456         if (new_fdt) {
 457                 memcpy(new_fdt, gd->fdt_blob, fdt_size);
 458                 gd->fdt_blob = new_fdt;
 459         }
 460         memcpy(id, (void *)gd, sizeof(gd_t));
 461
 462         relocate_code(addr_sp, id, addr);
 463
 464         /* NOTREACHED - relocate_code() does not return */
 465 }
 466
 467 #if !defined(CONFIG_SYS_NO_FLASH)
 468 static char *failed = "*** failed ***\n";
 469 #endif
 470
 471 /*
 472  ************************************************************************
 473  *
 474  * This is the next part if the initialization sequence: we are now
 475  * running from RAM and have a "normal" C environment, i. e. global
 476  * data can be written, BSS has been cleared, the stack size in not
 477  * that critical any more, etc.
 478  *
 479  ************************************************************************
 480  */
 481
 482 void board_init_r(gd_t *id, ulong dest_addr)
 483 {
 484         ulong malloc_start;
 485 #if !defined(CONFIG_SYS_NO_FLASH)
 486         ulong flash_size;
 487 #endif
 488
 489         gd = id;
 490
 491         gd->flags |= GD_FLG_RELOC;      /* tell others: relocation done */
 492         bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_R, "board_init_r");
 493
 494         monitor_flash_len = _end_ofs;
 495
 496         /* Enable caches */
 497         enable_caches();
 498
 499         debug("monitor flash len: %08lX\n", monitor_flash_len);
 500         board_init();   /* Setup chipselects */
 501         /*
 502          * TODO: printing of the clock inforamtion of the board is now
 503          * implemented as part of bdinfo command. Currently only support for
 504          * davinci SOC's is added. Remove this check once all the board
 505          * implement this.
 506          */
 507 #ifdef CONFIG_CLOCKS
 508         set_cpu_clk_info(); /* Setup clock information */
 509 #endif
 510         serial_initialize();
 511
 512         debug("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
 513
 514 #ifdef CONFIG_LOGBUFFER
 515         logbuff_init_ptrs();
 516 #endif
 517 #ifdef CONFIG_POST
 518         post_output_backlog();
 519 #endif
 520
 521         /* The Malloc area is immediately below the monitor copy in DRAM */
 522         malloc_start = dest_addr - TOTAL_MALLOC_LEN;
 523         mem_malloc_init (malloc_start, TOTAL_MALLOC_LEN);
 524
 525 #ifdef CONFIG_ARCH_EARLY_INIT_R
 526         arch_early_init_r();
 527 #endif
 528
 529 #if !defined(CONFIG_SYS_NO_FLASH)
 530         puts("Flash: ");
 531
 532         flash_size = flash_init();
 533         if (flash_size > 0) {
 534 # ifdef CONFIG_SYS_FLASH_CHECKSUM
 535                 char *s = getenv("flashchecksum");
 536
 537                 print_size(flash_size, "");
 538                 /*
 539                  * Compute and print flash CRC if flashchecksum is set to 'y'
 540                  *
 541                  * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX
 542                  */
 543                 if (s && (*s == 'y')) {
 544                         printf("  CRC: %08X", crc32(0,
 545                                 (const unsigned char *) CONFIG_SYS_FLASH_BASE,
 546                                 flash_size));
 547                 }
 548                 putc('\n');
 549 # else  /* !CONFIG_SYS_FLASH_CHECKSUM */
 550                 print_size(flash_size, "\n");
 551 # endif /* CONFIG_SYS_FLASH_CHECKSUM */
 552         } else {
 553                 puts(failed);
 554                 hang();
 555         }
 556 #endif
 557
 558 #if defined(CONFIG_CMD_NAND)
 559         puts("NAND:  ");
 560         nand_init();            /* go init the NAND */
 561 #endif
 562
 563 #if defined(CONFIG_CMD_ONENAND)
 564         onenand_init();
 565 #endif
 566
 567 #ifdef CONFIG_GENERIC_MMC
 568        puts("MMC:   ");
 569        mmc_initialize(gd->bd);
 570 #endif
 571
 572 #ifdef CONFIG_HAS_DATAFLASH
 573         AT91F_DataflashInit();
 574         dataflash_print_info();
 575 #endif
 576
 577         /* initialize environment */
 578         env_relocate();
 579
 580 #if defined(CONFIG_CMD_PCI) || defined(CONFIG_PCI)
 581         arm_pci_init();
 582 #endif
 583
 584         stdio_init();   /* get the devices list going. */
 585
 586         jumptable_init();
 587
 588 #if defined(CONFIG_API)
 589         /* Initialize API */
 590         api_init();
 591 #endif
 592
 593         console_init_r();       /* fully init console as a device */
 594
 595 #if defined(CONFIG_ARCH_MISC_INIT)
 596         /* miscellaneous arch dependent initialisations */
 597         arch_misc_init();
 598 #endif
 599 #if defined(CONFIG_MISC_INIT_R)
 600         /* miscellaneous platform dependent initialisations */
 601         misc_init_r();
 602 #endif
 603
 604          /* set up exceptions */
 605         interrupt_init();
 606         /* enable exceptions */
 607         enable_interrupts();
 608
 609         /* Initialize from environment */
 610         load_addr = getenv_ulong("loadaddr", 16, load_addr);
 611
 612 #ifdef CONFIG_BOARD_LATE_INIT
 613         board_late_init();
 614 #endif
 615
 616 #ifdef CONFIG_BITBANGMII
 617         bb_miiphy_init();
 618 #endif
 619 #if defined(CONFIG_CMD_NET)
 620         puts("Net:   ");
 621         eth_initialize(gd->bd);
 622 #if defined(CONFIG_RESET_PHY_R)
 623         debug("Reset Ethernet PHY\n");
 624         reset_phy();
 625 #endif
 626 #endif
 627
 628 #ifdef CONFIG_POST
 629         post_run(NULL, POST_RAM | post_bootmode_get(0));
 630 #endif
 631
 632 #if defined(CONFIG_PRAM) || defined(CONFIG_LOGBUFFER)
 633         /*
 634          * Export available size of memory for Linux,
 635          * taking into account the protected RAM at top of memory
 636          */
 637         {
 638                 ulong pram = 0;
 639                 uchar memsz[32];
 640
 641 #ifdef CONFIG_PRAM
 642                 pram = getenv_ulong("pram", 10, CONFIG_PRAM);
 643 #endif
 644 #ifdef CONFIG_LOGBUFFER
 645 #ifndef CONFIG_ALT_LB_ADDR
 646                 /* Also take the logbuffer into account (pram is in kB) */
 647                 pram += (LOGBUFF_LEN + LOGBUFF_OVERHEAD) / 1024;
 648 #endif
 649 #endif
 650                 sprintf((char *)memsz, "%ldk", (gd->ram_size / 1024) - pram);
 651                 setenv("mem", (char *)memsz);
 652         }
 653 #endif
 654
 655         /* main_loop() can return to retry autoboot, if so just run it again. */
 656         for (;;) {
 657                 main_loop();
 658         }
 659
 660         /* NOTREACHED - no way out of command loop except booting */
 661 }
 662
 663 void hang(void)
 664 {
 665         puts("### ERROR ### Please RESET the board ###\n");
 666         for (;;);
 667 }