board.c

u-boot-1.1.6 源码包

	debug ("Stack Pointer at: %08lx\n", addr_sp);

	/*
	 * Save local variables to board info struct
	 */
	bd->bi_memstart  = CFG_SDRAM_BASE;	/* start of  DRAM memory      */
	bd->bi_memsize   = gd->ram_size;	/* size  of  DRAM memory in bytes */
	bd->bi_mbar_base = CFG_MBAR;		/* base of internal registers */

	bd->bi_bootflags = bootflag;		/* boot / reboot flag (for LynxOS)    */

	WATCHDOG_RESET ();
	bd->bi_intfreq = gd->cpu_clk;	/* Internal Freq, in Hz */
	bd->bi_busfreq = gd->bus_clk;	/* Bus Freq,      in Hz */
	bd->bi_baudrate = gd->baudrate;	/* Console Baudrate     */

#ifdef CFG_EXTBDINFO
	strncpy (bd->bi_s_version, "1.2", sizeof (bd->bi_s_version));
	strncpy (bd->bi_r_version, U_BOOT_VERSION, sizeof (bd->bi_r_version));
#endif

	WATCHDOG_RESET ();

#ifdef CONFIG_POST
	post_bootmode_init();
	post_run (NULL, POST_ROM | post_bootmode_get(0));
#endif

	WATCHDOG_RESET();

	memcpy (id, (void *)gd, sizeof (gd_t));

	debug ("Start relocate of code from %08x to %08lx\n", CFG_MONITOR_BASE, addr);
	relocate_code (addr_sp, id, addr);

	/* NOTREACHED - jump_to_ram() does not return */
}

/************************************************************************
 *
 * This is the next part if the initialization sequence: we are now
 * running from RAM and have a "normal" C environment, i. e. global
 * data can be written, BSS has been cleared, the stack size in not
 * that critical any more, etc.
 *
 ************************************************************************
 */
void board_init_r (gd_t *id, ulong dest_addr)
{
	cmd_tbl_t *cmdtp;
	char *s, *e;
	bd_t *bd;
	int i;
	extern void malloc_bin_reloc (void);

#ifndef CFG_ENV_IS_NOWHERE
	extern char * env_name_spec;
#endif
#ifndef CFG_NO_FLASH
	ulong flash_size;
#endif
	gd = id;		/* initialize RAM version of global data */
	bd = gd->bd;

	gd->flags |= GD_FLG_RELOC;	/* tell others: relocation done */

	debug ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);

	WATCHDOG_RESET ();

	gd->reloc_off =  dest_addr - CFG_MONITOR_BASE;

	monitor_flash_len = (ulong)&__init_end - dest_addr;

	/*
	 * We have to relocate the command table manually
	 */
	for (cmdtp = &__u_boot_cmd_start; cmdtp !=  &__u_boot_cmd_end; cmdtp++) {
		ulong addr;
		addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
#if 0
		printf ("Command \"%s\": 0x%08lx => 0x%08lx\n",
				cmdtp->name, (ulong) (cmdtp->cmd), addr);
#endif
		cmdtp->cmd =
			(int (*)(struct cmd_tbl_s *, int, int, char *[]))addr;

		addr = (ulong)(cmdtp->name) + gd->reloc_off;
		cmdtp->name = (char *)addr;

		if (cmdtp->usage) {
			addr = (ulong)(cmdtp->usage) + gd->reloc_off;
			cmdtp->usage = (char *)addr;
		}
#ifdef	CFG_LONGHELP
		if (cmdtp->help) {
			addr = (ulong)(cmdtp->help) + gd->reloc_off;
			cmdtp->help = (char *)addr;
		}
#endif
	}
	/* there are some other pointer constants we must deal with */
#ifndef CFG_ENV_IS_NOWHERE
	env_name_spec += gd->reloc_off;
#endif

	WATCHDOG_RESET ();

#ifdef CONFIG_LOGBUFFER
	logbuff_init_ptrs ();
#endif
#ifdef CONFIG_POST
	post_output_backlog ();
	post_reloc ();
#endif
	WATCHDOG_RESET();

#if 0
	/* instruction cache enabled in cpu_init_f() for faster relocation */
	icache_enable ();	/* it's time to enable the instruction cache */
#endif

	/*
	 * Setup trap handlers
	 */
	trap_init (0);

#if !defined(CFG_NO_FLASH)
	puts ("FLASH: ");

	if ((flash_size = flash_init ()) > 0) {
# ifdef CFG_FLASH_CHECKSUM
		print_size (flash_size, "");
		/*
		 * Compute and print flash CRC if flashchecksum is set to 'y'
		 *
		 * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX
		 */
		s = getenv ("flashchecksum");
		if (s && (*s == 'y')) {
			printf ("  CRC: %08lX",
					crc32 (0,
						   (const unsigned char *) CFG_FLASH_BASE,
						   flash_size)
					);
		}
		putc ('\n');
# else	/* !CFG_FLASH_CHECKSUM */
		print_size (flash_size, "\n");
# endif /* CFG_FLASH_CHECKSUM */
	} else {
		puts (failed);
		hang ();
	}

	bd->bi_flashstart = CFG_FLASH_BASE;	/* update start of FLASH memory    */
	bd->bi_flashsize = flash_size;	/* size of FLASH memory (final value) */
	bd->bi_flashoffset = 0;
#else	/* CFG_NO_FLASH */
	bd->bi_flashsize = 0;
	bd->bi_flashstart = 0;
	bd->bi_flashoffset = 0;
#endif /* !CFG_NO_FLASH */

	WATCHDOG_RESET ();

	/* initialize higher level parts of CPU like time base and timers */
	cpu_init_r ();

	WATCHDOG_RESET ();

	/* initialize malloc() area */
	mem_malloc_init ();
	malloc_bin_reloc ();

#ifdef CONFIG_SPI
# if !defined(CFG_ENV_IS_IN_EEPROM)
	spi_init_f ();
# endif
	spi_init_r ();
#endif

	/* relocate environment function pointers etc. */
	env_relocate ();

	/*
	 * Fill in missing fields of bd_info.
	 * We do this here, where we have "normal" access to the
	 * environment; we used to do this still running from ROM,
	 * where had to use getenv_r(), which can be pretty slow when
	 * the environment is in EEPROM.
	 */
	s = getenv ("ethaddr");
	for (i = 0; i < 6; ++i) {
		bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
		if (s)
			s = (*e) ? e + 1 : e;
	}

	/* IP Address */
	bd->bi_ip_addr = getenv_IPaddr ("ipaddr");

	WATCHDOG_RESET ();


	/** leave this here (after malloc(), environment and PCI are working) **/
	/* Initialize devices */
	devices_init ();

	/* Initialize the jump table for applications */
	jumptable_init ();

	/* Initialize the console (after the relocation and devices init) */
	console_init_r ();

#if defined(CONFIG_MISC_INIT_R)
	/* miscellaneous platform dependent initialisations */
	misc_init_r ();
#endif

#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	WATCHDOG_RESET ();
	puts ("KGDB:  ");
	kgdb_init ();
#endif

	debug ("U-Boot relocated to %08lx\n", dest_addr);

	/*
	 * Enable Interrupts
	 */
	interrupt_init ();

	/* Must happen after interrupts are initialized since
	 * an irq handler gets installed
	 */
	timer_init();

#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
	serial_buffered_init();
#endif

#ifdef CONFIG_STATUS_LED
	status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
#endif

	udelay (20);

	set_timer (0);

	/* Insert function pointers now that we have relocated the code */

	/* Initialize from environment */
	if ((s = getenv ("loadaddr")) != NULL) {
		load_addr = simple_strtoul (s, NULL, 16);
	}
#if (CONFIG_COMMANDS & CFG_CMD_NET)
	if ((s = getenv ("bootfile")) != NULL) {
		copy_filename (BootFile, s, sizeof (BootFile));
	}
#endif /* CFG_CMD_NET */

	WATCHDOG_RESET ();

#if (CONFIG_COMMANDS & CFG_CMD_DOC)
	WATCHDOG_RESET ();
	puts ("DOC:   ");
	doc_init ();
#endif

#if (CONFIG_COMMANDS & CFG_CMD_NAND)
	WATCHDOG_RESET ();
	puts ("NAND:  ");
	nand_init();		/* go init the NAND */
#endif

#if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(FEC_ENET)
	WATCHDOG_RESET();
	eth_init(bd);
#endif

#ifdef CONFIG_POST
	post_run (NULL, POST_RAM | post_bootmode_get(0));
#endif

#ifdef CONFIG_LAST_STAGE_INIT
	WATCHDOG_RESET ();
	/*
	 * Some parts can be only initialized if all others (like
	 * Interrupts) are up and running (i.e. the PC-style ISA
	 * keyboard).
	 */
	last_stage_init ();
#endif

#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
	WATCHDOG_RESET ();
	bedbug_init ();
#endif

#if defined(CONFIG_PRAM) || defined(CONFIG_LOGBUFFER)
	/*
	 * Export available size of memory for Linux,
	 * taking into account the protected RAM at top of memory
	 */
	{
		ulong pram;
		uchar memsz[32];
#ifdef CONFIG_PRAM
		char *s;

		if ((s = getenv ("pram")) != NULL) {
			pram = simple_strtoul (s, NULL, 10);
		} else {
			pram = CONFIG_PRAM;
		}
#else
		pram=0;
#endif
#ifdef CONFIG_LOGBUFFER
		/* Also take the logbuffer into account (pram is in kB) */
		pram += (LOGBUFF_LEN+LOGBUFF_OVERHEAD)/1024;
#endif
		sprintf (memsz, "%ldk", (bd->bi_memsize / 1024) - pram);
		setenv ("mem", memsz);
	}
#endif

#ifdef CONFIG_MODEM_SUPPORT
 {
	 extern int do_mdm_init;
	 do_mdm_init = gd->do_mdm_init;
 }
#endif

#ifdef CONFIG_WATCHDOG
	/* disable watchdog if environment is set */
	if ((s = getenv ("watchdog")) != NULL) {
		if (strncmp (s, "off", 3) == 0) {
			WATCHDOG_DISABLE ();
		}
	}
#endif /* CONFIG_WATCHDOG*/


	/* Initialization complete - start the monitor */

	/* main_loop() can return to retry autoboot, if so just run it again. */
	for (;;) {
		WATCHDOG_RESET ();
		main_loop ();
	}

	/* NOTREACHED - no way out of command loop except booting */
}


void hang(void)
{
	puts ("### ERROR ### Please RESET the board ###\n");
	for (;;);
}