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 #include <linux/compiler.h>
  33
  34 #include <asm/immap.h>
  35
  36 #if defined(CONFIG_CMD_IDE)
  37 #include <ide.h>
  38 #endif
  39 #if defined(CONFIG_CMD_SCSI)
  40 #include <scsi.h>
  41 #endif
  42 #if defined(CONFIG_CMD_KGDB)
  43 #include <kgdb.h>
  44 #endif
  45 #ifdef CONFIG_STATUS_LED
  46 #include <status_led.h>
  47 #endif
  48 #include <net.h>
  49 #include <serial.h>
  50 #if defined(CONFIG_CMD_BEDBUG)
  51 #include <cmd_bedbug.h>
  52 #endif
  53 #ifdef CONFIG_SYS_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 #ifdef CONFIG_CMD_SPI
  64 #include <spi.h>
  65 #endif
  66
  67 #ifdef CONFIG_BITBANGMII
  68 #include <miiphy.h>
  69 #endif
  70
  71 #include <nand.h>
  72
  73 DECLARE_GLOBAL_DATA_PTR;
  74
  75 static char *failed = "*** failed ***\n";
  76
  77 #include <environment.h>
  78
  79 extern ulong __init_end;
  80 extern ulong __bss_end;
  81
  82 #if defined(CONFIG_WATCHDOG)
  83 # undef INIT_FUNC_WATCHDOG_INIT
  84 # define INIT_FUNC_WATCHDOG_INIT        watchdog_init,
  85 # define WATCHDOG_DISABLE               watchdog_disable
  86
  87 extern int watchdog_init(void);
  88 extern int watchdog_disable(void);
  89 #else
  90 # define INIT_FUNC_WATCHDOG_INIT        /* undef */
  91 # define WATCHDOG_DISABLE               /* undef */
  92 #endif /* CONFIG_WATCHDOG */
  93
  94 ulong monitor_flash_len;
  95
  96 /************************************************************************
  97  * Utilities                                                            *
  98  ************************************************************************
  99  */
 100
 101 /*
 102  * All attempts to come up with a "common" initialization sequence
 103  * that works for all boards and architectures failed: some of the
 104  * requirements are just _too_ different. To get rid of the resulting
 105  * mess of board dependend #ifdef'ed code we now make the whole
 106  * initialization sequence configurable to the user.
 107  *
 108  * The requirements for any new initalization function is simple: it
 109  * receives a pointer to the "global data" structure as it's only
 110  * argument, and returns an integer return code, where 0 means
 111  * "continue" and != 0 means "fatal error, hang the system".
 112  */
 113 typedef int (init_fnc_t) (void);
 114
 115 /************************************************************************
 116  * Init Utilities
 117  ************************************************************************
 118  * Some of this code should be moved into the core functions,
 119  * but let's get it working (again) first...
 120  */
 121
 122 static int init_baudrate (void)
 123 {
 124         gd->baudrate = getenv_ulong("baudrate", 10, CONFIG_BAUDRATE);
 125         return 0;
 126 }
 127
 128 /***********************************************************************/
 129
 130 static int init_func_ram (void)
 131 {
 132         int board_type = 0;     /* use dummy arg */
 133         puts ("DRAM:  ");
 134
 135         if ((gd->ram_size = initdram (board_type)) > 0) {
 136                 print_size (gd->ram_size, "\n");
 137                 return (0);
 138         }
 139         puts (failed);
 140         return (1);
 141 }
 142
 143 /***********************************************************************/
 144
 145 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C) || \
 146                 defined(CONFIG_SYS_I2C)
 147 static int init_func_i2c (void)
 148 {
 149         puts ("I2C:   ");
 150 #ifdef CONFIG_SYS_I2C
 151         i2c_init_all();
 152 #else
 153         i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 154 #endif
 155         puts ("ready\n");
 156         return (0);
 157 }
 158 #endif
 159
 160 #if defined(CONFIG_HARD_SPI)
 161 static int init_func_spi (void)
 162 {
 163         puts ("SPI:   ");
 164         spi_init ();
 165         puts ("ready\n");
 166         return (0);
 167 }
 168 #endif
 169
 170 /***********************************************************************/
 171
 172 /************************************************************************
 173  * Initialization sequence                                              *
 174  ************************************************************************
 175  */
 176
 177 init_fnc_t *init_sequence[] = {
 178         get_clocks,
 179         env_init,
 180         init_baudrate,
 181         serial_init,
 182         console_init_f,
 183         display_options,
 184         checkcpu,
 185         checkboard,
 186 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C) || \
 187                 defined(CONFIG_SYS_I2C)
 188         init_func_i2c,
 189 #endif
 190 #if defined(CONFIG_HARD_SPI)
 191         init_func_spi,
 192 #endif
 193         init_func_ram,
 194 #if defined(CONFIG_SYS_DRAM_TEST)
 195         testdram,
 196 #endif /* CONFIG_SYS_DRAM_TEST */
 197         INIT_FUNC_WATCHDOG_INIT
 198         NULL,                   /* Terminate this list */
 199 };
 200
 201
 202 /************************************************************************
 203  *
 204  * This is the first part of the initialization sequence that is
 205  * implemented in C, but still running from ROM.
 206  *
 207  * The main purpose is to provide a (serial) console interface as
 208  * soon as possible (so we can see any error messages), and to
 209  * initialize the RAM so that we can relocate the monitor code to
 210  * RAM.
 211  *
 212  * Be aware of the restrictions: global data is read-only, BSS is not
 213  * initialized, and stack space is limited to a few kB.
 214  *
 215  ************************************************************************
 216  */
 217
 218 void
 219 board_init_f (ulong bootflag)
 220 {
 221         bd_t *bd;
 222         ulong len, addr, addr_sp;
 223         ulong *paddr;
 224         gd_t *id;
 225         init_fnc_t **init_fnc_ptr;
 226 #ifdef CONFIG_PRAM
 227         ulong reg;
 228 #endif
 229
 230         /* Pointer is writable since we allocated a register for it */
 231         gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
 232         /* compiler optimization barrier needed for GCC >= 3.4 */
 233         __asm__ __volatile__("": : :"memory");
 234
 235         /* Clear initial global data */
 236         memset ((void *) gd, 0, sizeof (gd_t));
 237
 238         for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 239                 if ((*init_fnc_ptr)() != 0) {
 240                         hang ();
 241                 }
 242         }
 243
 244         /*
 245          * Now that we have DRAM mapped and working, we can
 246          * relocate the code and continue running from DRAM.
 247          *
 248          * Reserve memory at end of RAM for (top down in that order):
 249          *      - protected RAM
 250          *      - LCD framebuffer
 251          *      - monitor code
 252          *      - board info struct
 253          */
 254         len = (ulong)&__bss_end - CONFIG_SYS_MONITOR_BASE;
 255
 256         addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size;
 257
 258 #ifdef CONFIG_LOGBUFFER
 259         /* reserve kernel log buffer */
 260         addr -= (LOGBUFF_RESERVE);
 261         debug ("Reserving %dk for kernel logbuffer at %08lx\n", LOGBUFF_LEN, addr);
 262 #endif
 263
 264 #ifdef CONFIG_PRAM
 265         /*
 266          * reserve protected RAM
 267          */
 268         reg = getenv_ulong("pram", 10, CONFIG_PRAM);
 269         addr -= (reg << 10);            /* size is in kB */
 270         debug ("Reserving %ldk for protected RAM at %08lx\n", reg, addr);
 271 #endif /* CONFIG_PRAM */
 272
 273         /* round down to next 4 kB limit */
 274         addr &= ~(4096 - 1);
 275         debug ("Top of RAM usable for U-Boot at: %08lx\n", addr);
 276
 277 #ifdef CONFIG_LCD
 278 #ifdef CONFIG_FB_ADDR
 279         gd->fb_base = CONFIG_FB_ADDR;
 280 #else
 281         /* reserve memory for LCD display (always full pages) */
 282         addr = lcd_setmem (addr);
 283         gd->fb_base = addr;
 284 #endif /* CONFIG_FB_ADDR */
 285 #endif /* CONFIG_LCD */
 286
 287         /*
 288          * reserve memory for U-Boot code, data & bss
 289          * round down to next 4 kB limit
 290          */
 291         addr -= len;
 292         addr &= ~(4096 - 1);
 293
 294         debug ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
 295
 296         /*
 297          * reserve memory for malloc() arena
 298          */
 299         addr_sp = addr - TOTAL_MALLOC_LEN;
 300         debug ("Reserving %dk for malloc() at: %08lx\n",
 301                         TOTAL_MALLOC_LEN >> 10, addr_sp);
 302
 303         /*
 304          * (permanently) allocate a Board Info struct
 305          * and a permanent copy of the "global" data
 306          */
 307         addr_sp -= sizeof (bd_t);
 308         bd = (bd_t *) addr_sp;
 309         gd->bd = bd;
 310         debug ("Reserving %zu Bytes for Board Info at: %08lx\n",
 311                         sizeof (bd_t), addr_sp);
 312         addr_sp -= sizeof (gd_t);
 313         id = (gd_t *) addr_sp;
 314         debug ("Reserving %zu Bytes for Global Data at: %08lx\n",
 315                         sizeof (gd_t), addr_sp);
 316
 317         /* Reserve memory for boot params. */
 318         addr_sp -= CONFIG_SYS_BOOTPARAMS_LEN;
 319         bd->bi_boot_params = addr_sp;
 320         debug ("Reserving %dk for boot parameters at: %08lx\n",
 321                         CONFIG_SYS_BOOTPARAMS_LEN >> 10, addr_sp);
 322
 323         /*
 324          * Finally, we set up a new (bigger) stack.
 325          *
 326          * Leave some safety gap for SP, force alignment on 16 byte boundary
 327          * Clear initial stack frame
 328          */
 329         addr_sp -= 16;
 330         addr_sp &= ~0xF;
 331
 332         paddr = (ulong *)addr_sp;
 333         *paddr-- = 0;
 334         *paddr-- = 0;
 335         addr_sp = (ulong)paddr;
 336
 337         debug ("Stack Pointer at: %08lx\n", addr_sp);
 338
 339         /*
 340          * Save local variables to board info struct
 341          */
 342         bd->bi_memstart  = CONFIG_SYS_SDRAM_BASE;       /* start of  DRAM memory      */
 343         bd->bi_memsize   = gd->ram_size;        /* size  of  DRAM memory in bytes */
 344 #ifdef CONFIG_SYS_INIT_RAM_ADDR
 345         bd->bi_sramstart = CONFIG_SYS_INIT_RAM_ADDR;    /* start of  SRAM memory        */
 346         bd->bi_sramsize  = CONFIG_SYS_INIT_RAM_SIZE;    /* size  of  SRAM memory        */
 347 #endif
 348         bd->bi_mbar_base = CONFIG_SYS_MBAR;             /* base of internal registers */
 349
 350         bd->bi_bootflags = bootflag;            /* boot / reboot flag (for LynxOS)    */
 351
 352         WATCHDOG_RESET ();
 353         bd->bi_intfreq = gd->cpu_clk;   /* Internal Freq, in Hz */
 354         bd->bi_busfreq = gd->bus_clk;   /* Bus Freq,      in Hz */
 355 #ifdef CONFIG_PCI
 356         bd->bi_pcifreq = gd->pci_clk;           /* PCI Freq in Hz */
 357 #endif
 358 #ifdef CONFIG_EXTRA_CLOCK
 359         bd->bi_inpfreq = gd->arch.inp_clk;              /* input Freq in Hz */
 360         bd->bi_vcofreq = gd->arch.vco_clk;              /* vco Freq in Hz */
 361         bd->bi_flbfreq = gd->arch.flb_clk;              /* flexbus Freq in Hz */
 362 #endif
 363         bd->bi_baudrate = gd->baudrate; /* Console Baudrate     */
 364
 365 #ifdef CONFIG_SYS_EXTBDINFO
 366         strncpy (bd->bi_s_version, "1.2", sizeof (bd->bi_s_version));
 367         strncpy (bd->bi_r_version, U_BOOT_VERSION, sizeof (bd->bi_r_version));
 368 #endif
 369
 370         WATCHDOG_RESET ();
 371
 372 #ifdef CONFIG_POST
 373         post_bootmode_init();
 374         post_run (NULL, POST_ROM | post_bootmode_get(0));
 375 #endif
 376
 377         WATCHDOG_RESET();
 378
 379         memcpy (id, (void *)gd, sizeof (gd_t));
 380
 381         debug ("Start relocate of code from %08x to %08lx\n", CONFIG_SYS_MONITOR_BASE, addr);
 382         relocate_code (addr_sp, id, addr);
 383
 384         /* NOTREACHED - jump_to_ram() does not return */
 385 }
 386
 387 /************************************************************************
 388  *
 389  * This is the next part if the initialization sequence: we are now
 390  * running from RAM and have a "normal" C environment, i. e. global
 391  * data can be written, BSS has been cleared, the stack size in not
 392  * that critical any more, etc.
 393  *
 394  ************************************************************************
 395  */
 396 void board_init_r (gd_t *id, ulong dest_addr)
 397 {
 398         char *s __maybe_unused;
 399         bd_t *bd;
 400
 401 #ifndef CONFIG_ENV_IS_NOWHERE
 402         extern char * env_name_spec;
 403 #endif
 404 #ifndef CONFIG_SYS_NO_FLASH
 405         ulong flash_size;
 406 #endif
 407         gd = id;                /* initialize RAM version of global data */
 408         bd = gd->bd;
 409
 410         gd->flags |= GD_FLG_RELOC;      /* tell others: relocation done */
 411
 412         WATCHDOG_RESET ();
 413
 414         gd->reloc_off =  dest_addr - CONFIG_SYS_MONITOR_BASE;
 415
 416         serial_initialize();
 417
 418         debug("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
 419
 420         monitor_flash_len = (ulong)&__init_end - dest_addr;
 421
 422 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 423         /*
 424          * We have to relocate the command table manually
 425          */
 426         fixup_cmdtable(ll_entry_start(cmd_tbl_t, cmd),
 427                         ll_entry_count(cmd_tbl_t, cmd));
 428 #endif /* defined(CONFIG_NEEDS_MANUAL_RELOC) */
 429
 430         /* there are some other pointer constants we must deal with */
 431 #ifndef CONFIG_ENV_IS_NOWHERE
 432         env_name_spec += gd->reloc_off;
 433 #endif
 434
 435         WATCHDOG_RESET ();
 436
 437 #ifdef CONFIG_LOGBUFFER
 438         logbuff_init_ptrs ();
 439 #endif
 440 #ifdef CONFIG_POST
 441         post_output_backlog ();
 442         post_reloc ();
 443 #endif
 444         WATCHDOG_RESET();
 445
 446 #if 0
 447         /* instruction cache enabled in cpu_init_f() for faster relocation */
 448         icache_enable ();       /* it's time to enable the instruction cache */
 449 #endif
 450
 451         /*
 452          * Setup trap handlers
 453          */
 454         trap_init (CONFIG_SYS_SDRAM_BASE);
 455
 456         /* The Malloc area is immediately below the monitor copy in DRAM */
 457         mem_malloc_init (CONFIG_SYS_MONITOR_BASE + gd->reloc_off -
 458                         TOTAL_MALLOC_LEN, TOTAL_MALLOC_LEN);
 459
 460 #if !defined(CONFIG_SYS_NO_FLASH)
 461         puts ("Flash: ");
 462
 463         if ((flash_size = flash_init ()) > 0) {
 464 # ifdef CONFIG_SYS_FLASH_CHECKSUM
 465                 print_size (flash_size, "");
 466                 /*
 467                  * Compute and print flash CRC if flashchecksum is set to 'y'
 468                  *
 469                  * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX
 470                  */
 471                 if (getenv_yesno("flashchecksum") == 1) {
 472                         printf ("  CRC: %08X",
 473                                         crc32 (0,
 474                                                    (const unsigned char *) CONFIG_SYS_FLASH_BASE,
 475                                                    flash_size)
 476                                         );
 477                 }
 478                 putc ('\n');
 479 # else  /* !CONFIG_SYS_FLASH_CHECKSUM */
 480                 print_size (flash_size, "\n");
 481 # endif /* CONFIG_SYS_FLASH_CHECKSUM */
 482         } else {
 483                 puts (failed);
 484                 hang ();
 485         }
 486
 487         bd->bi_flashstart = CONFIG_SYS_FLASH_BASE;      /* update start of FLASH memory    */
 488         bd->bi_flashsize = flash_size;  /* size of FLASH memory (final value) */
 489         bd->bi_flashoffset = 0;
 490 #else   /* CONFIG_SYS_NO_FLASH */
 491         bd->bi_flashsize = 0;
 492         bd->bi_flashstart = 0;
 493         bd->bi_flashoffset = 0;
 494 #endif /* !CONFIG_SYS_NO_FLASH */
 495
 496         WATCHDOG_RESET ();
 497
 498         /* initialize higher level parts of CPU like time base and timers */
 499         cpu_init_r ();
 500
 501         WATCHDOG_RESET ();
 502
 503 #ifdef CONFIG_SPI
 504 # if !defined(CONFIG_ENV_IS_IN_EEPROM)
 505         spi_init_f ();
 506 # endif
 507         spi_init_r ();
 508 #endif
 509
 510 #if defined(CONFIG_SYS_I2C)
 511         /* Adjust I2C subsystem pointers after relocation */
 512         i2c_reloc_fixup();
 513 #endif
 514
 515         /* relocate environment function pointers etc. */
 516         env_relocate ();
 517
 518         WATCHDOG_RESET ();
 519
 520 #if defined(CONFIG_PCI)
 521         /*
 522          * Do pci configuration
 523          */
 524         pci_init ();
 525 #endif
 526
 527         /** leave this here (after malloc(), environment and PCI are working) **/
 528         /* Initialize stdio devices */
 529         stdio_init ();
 530
 531         /* Initialize the jump table for applications */
 532         jumptable_init ();
 533
 534         /* Initialize the console (after the relocation and devices init) */
 535         console_init_r ();
 536
 537 #if defined(CONFIG_MISC_INIT_R)
 538         /* miscellaneous platform dependent initialisations */
 539         misc_init_r ();
 540 #endif
 541
 542 #if defined(CONFIG_CMD_KGDB)
 543         WATCHDOG_RESET ();
 544         puts ("KGDB:  ");
 545         kgdb_init ();
 546 #endif
 547
 548         debug ("U-Boot relocated to %08lx\n", dest_addr);
 549
 550         /*
 551          * Enable Interrupts
 552          */
 553         interrupt_init ();
 554
 555         /* Must happen after interrupts are initialized since
 556          * an irq handler gets installed
 557          */
 558         timer_init();
 559
 560 #ifdef CONFIG_STATUS_LED
 561         status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
 562 #endif
 563
 564         udelay (20);
 565
 566         /* Insert function pointers now that we have relocated the code */
 567
 568         /* Initialize from environment */
 569         load_addr = getenv_ulong("loadaddr", 16, load_addr);
 570
 571         WATCHDOG_RESET ();
 572
 573 #if defined(CONFIG_CMD_DOC)
 574         WATCHDOG_RESET ();
 575         puts ("DOC:   ");
 576         doc_init ();
 577 #endif
 578
 579 #if defined(CONFIG_CMD_NAND)
 580         WATCHDOG_RESET ();
 581         puts ("NAND:  ");
 582         nand_init();            /* go init the NAND */
 583 #endif
 584
 585 #ifdef CONFIG_BITBANGMII
 586         bb_miiphy_init();
 587 #endif
 588 #if defined(CONFIG_CMD_NET)
 589         WATCHDOG_RESET();
 590 #if defined(FEC_ENET)
 591         eth_init(bd);
 592 #endif
 593         puts ("Net:   ");
 594         eth_initialize (bd);
 595 #endif
 596
 597 #ifdef CONFIG_POST
 598         post_run (NULL, POST_RAM | post_bootmode_get(0));
 599 #endif
 600
 601 #if defined(CONFIG_CMD_PCMCIA) \
 602     && !defined(CONFIG_CMD_IDE)
 603         WATCHDOG_RESET ();
 604         puts ("PCMCIA:");
 605         pcmcia_init ();
 606 #endif
 607
 608 #if defined(CONFIG_CMD_IDE)
 609         WATCHDOG_RESET ();
 610         puts ("IDE:   ");
 611         ide_init ();
 612 #endif
 613
 614 #ifdef CONFIG_LAST_STAGE_INIT
 615         WATCHDOG_RESET ();
 616         /*
 617          * Some parts can be only initialized if all others (like
 618          * Interrupts) are up and running (i.e. the PC-style ISA
 619          * keyboard).
 620          */
 621         last_stage_init ();
 622 #endif
 623
 624 #if defined(CONFIG_CMD_BEDBUG)
 625         WATCHDOG_RESET ();
 626         bedbug_init ();
 627 #endif
 628
 629 #if defined(CONFIG_PRAM) || defined(CONFIG_LOGBUFFER)
 630         /*
 631          * Export available size of memory for Linux,
 632          * taking into account the protected RAM at top of memory
 633          */
 634         {
 635                 ulong pram = 0;
 636                 char memsz[32];
 637
 638 #ifdef CONFIG_PRAM
 639                 pram = getenv_ulong("pram", 10, CONFIG_PRAM);
 640 #endif
 641 #ifdef CONFIG_LOGBUFFER
 642                 /* Also take the logbuffer into account (pram is in kB) */
 643                 pram += (LOGBUFF_LEN+LOGBUFF_OVERHEAD)/1024;
 644 #endif
 645                 sprintf (memsz, "%ldk", (bd->bi_memsize / 1024) - pram);
 646                 setenv ("mem", memsz);
 647         }
 648 #endif
 649
 650 #ifdef CONFIG_MODEM_SUPPORT
 651  {
 652          extern int do_mdm_init;
 653          do_mdm_init = gd->do_mdm_init;
 654  }
 655 #endif
 656
 657 #ifdef CONFIG_WATCHDOG
 658         /* disable watchdog if environment is set */
 659         if ((s = getenv ("watchdog")) != NULL) {
 660                 if (strncmp (s, "off", 3) == 0) {
 661                         WATCHDOG_DISABLE ();
 662                 }
 663         }
 664 #endif /* CONFIG_WATCHDOG*/
 665
 666
 667         /* Initialization complete - start the monitor */
 668
 669         /* main_loop() can return to retry autoboot, if so just run it again. */
 670         for (;;) {
 671                 WATCHDOG_RESET ();
 672                 main_loop ();
 673         }
 674
 675         /* NOTREACHED - no way out of command loop except booting */
 676 }