board.c

uboot详细解读可用启动引导LINUX2.6内核

/*
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <malloc.h>
#include <devices.h>
#ifdef CONFIG_8xx
#include <mpc8xx.h>
#endif
#ifdef CONFIG_5xx
#include <mpc5xx.h>
#endif
#ifdef CONFIG_MPC5xxx
#include <mpc5xxx.h>
#endif
#if defined(CONFIG_CMD_IDE)
#include <ide.h>
#endif
#if defined(CONFIG_CMD_SATA)
#include <sata.h>
#endif
#if defined(CONFIG_CMD_SCSI)
#include <scsi.h>
#endif
#if defined(CONFIG_CMD_KGDB)
#include <kgdb.h>
#endif
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#endif
#include <net.h>
#include <serial.h>
#ifdef CFG_ALLOC_DPRAM
#if !defined(CONFIG_CPM2)
#include <commproc.h>
#endif
#endif
#include <version.h>
#if defined(CONFIG_BAB7xx)
#include <w83c553f.h>
#endif
#include <dtt.h>
#if defined(CONFIG_POST)
#include <post.h>
#endif
#if defined(CONFIG_LOGBUFFER)
#include <logbuff.h>
#endif
#if defined(CFG_INIT_RAM_LOCK) && defined(CONFIG_E500)
#include <asm/cache.h>
#endif
#ifdef CONFIG_PS2KBD
#include <keyboard.h>
#endif

#ifdef CFG_UPDATE_FLASH_SIZE
extern int update_flash_size (int flash_size);
#endif

#if defined(CONFIG_SC3)
extern void sc3_read_eeprom(void);
#endif

#if defined(CONFIG_CMD_DOC)
void doc_init (void);
#endif
#if defined(CONFIG_HARD_I2C) || \
    defined(CONFIG_SOFT_I2C)
#include <i2c.h>
#endif
#include <spi.h>
#include <nand.h>

static char *failed = "*** failed ***\n";

#if defined(CONFIG_OXC) || defined(CONFIG_PCU_E) || defined(CONFIG_RMU)
extern flash_info_t flash_info[];
#endif

#if defined(CONFIG_START_IDE)
extern int board_start_ide(void);
#endif
#include <environment.h>

DECLARE_GLOBAL_DATA_PTR;

#if defined(CFG_ENV_IS_EMBEDDED)
#define TOTAL_MALLOC_LEN	CFG_MALLOC_LEN
#elif ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
	(CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
      defined(CFG_ENV_IS_IN_NVRAM)
#define	TOTAL_MALLOC_LEN	(CFG_MALLOC_LEN + CFG_ENV_SIZE)
#else
#define	TOTAL_MALLOC_LEN	CFG_MALLOC_LEN
#endif

#if !defined(CFG_MEM_TOP_HIDE)
#define CFG_MEM_TOP_HIDE	0
#endif

extern ulong __init_end;
extern ulong _end;
ulong monitor_flash_len;

#if defined(CONFIG_CMD_BEDBUG)
#include <bedbug/type.h>
#endif

/*
 * Begin and End of memory area for malloc(), and current "brk"
 */
static	ulong	mem_malloc_start = 0;
static	ulong	mem_malloc_end	 = 0;
static	ulong	mem_malloc_brk	 = 0;

/************************************************************************
 * Utilities								*
 ************************************************************************
 */

/*
 * The Malloc area is immediately below the monitor copy in DRAM
 */
static void mem_malloc_init (void)
{
#if !defined(CONFIG_RELOC_FIXUP_WORKS)
	mem_malloc_end = CFG_MONITOR_BASE + gd->reloc_off;
#endif
	mem_malloc_start = mem_malloc_end - TOTAL_MALLOC_LEN;
	mem_malloc_brk = mem_malloc_start;

	memset ((void *) mem_malloc_start,
		0,
		mem_malloc_end - mem_malloc_start);
}

void *sbrk (ptrdiff_t increment)
{
	ulong old = mem_malloc_brk;
	ulong new = old + increment;

	if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
		return (NULL);
	}
	mem_malloc_brk = new;
	return ((void *) old);
}

char *strmhz (char *buf, long hz)
{
	long l, n;
	long m;

	n = hz / 1000000L;
	l = sprintf (buf, "%ld", n);
	m = (hz % 1000000L) / 1000L;
	if (m != 0)
		sprintf (buf + l, ".%03ld", m);
	return (buf);
}

/*
 * All attempts to come up with a "common" initialization sequence
 * that works for all boards and architectures failed: some of the
 * requirements are just _too_ different. To get rid of the resulting
 * mess of board dependend #ifdef'ed code we now make the whole
 * initialization sequence configurable to the user.
 *
 * The requirements for any new initalization function is simple: it
 * receives a pointer to the "global data" structure as it's only
 * argument, and returns an integer return code, where 0 means
 * "continue" and != 0 means "fatal error, hang the system".
 */
typedef int (init_fnc_t) (void);

/************************************************************************
 * Init Utilities							*
 ************************************************************************
 * Some of this code should be moved into the core functions,
 * but let's get it working (again) first...
 */

static int init_baudrate (void)
{
	char tmp[64];	/* long enough for environment variables */
	int i = getenv_r ("baudrate", tmp, sizeof (tmp));

	gd->baudrate = (i > 0)
			? (int) simple_strtoul (tmp, NULL, 10)
			: CONFIG_BAUDRATE;
	return (0);
}

/***********************************************************************/

void __board_add_ram_info(int use_default)
{
	/* please define platform specific board_add_ram_info() */
}
void board_add_ram_info(int) __attribute__((weak, alias("__board_add_ram_info")));


static int init_func_ram (void)
{
#ifdef	CONFIG_BOARD_TYPES
	int board_type = gd->board_type;
#else
	int board_type = 0;	/* use dummy arg */
#endif
	puts ("DRAM:  ");

	if ((gd->ram_size = initdram (board_type)) > 0) {
		print_size (gd->ram_size, "");
		board_add_ram_info(0);
		putc('\n');
		return (0);
	}
	puts (failed);
	return (1);
}

/***********************************************************************/

#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
static int init_func_i2c (void)
{
	puts ("I2C:   ");
	i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
	puts ("ready\n");
	return (0);
}
#endif

#if defined(CONFIG_HARD_SPI)
static int init_func_spi (void)
{
	puts ("SPI:   ");
	spi_init ();
	puts ("ready\n");
	return (0);
}
#endif

/***********************************************************************/

#if defined(CONFIG_WATCHDOG)
static int init_func_watchdog_init (void)
{
	puts ("       Watchdog enabled\n");
	WATCHDOG_RESET ();
	return (0);
}
# define INIT_FUNC_WATCHDOG_INIT	init_func_watchdog_init,

static int init_func_watchdog_reset (void)
{
	WATCHDOG_RESET ();
	return (0);
}
# define INIT_FUNC_WATCHDOG_RESET	init_func_watchdog_reset,
#else
# define INIT_FUNC_WATCHDOG_INIT	/* undef */
# define INIT_FUNC_WATCHDOG_RESET	/* undef */
#endif /* CONFIG_WATCHDOG */

/************************************************************************
 * Initialization sequence						*
 ************************************************************************
 */

init_fnc_t *init_sequence[] = {

#if defined(CONFIG_BOARD_EARLY_INIT_F)
	board_early_init_f,
#endif

#if !defined(CONFIG_8xx_CPUCLK_DEFAULT)
	get_clocks,		/* get CPU and bus clocks (etc.) */
#if defined(CONFIG_TQM8xxL) && !defined(CONFIG_TQM866M) \
    && !defined(CONFIG_TQM885D)
	adjust_sdram_tbs_8xx,
#endif
	init_timebase,
#endif
#ifdef CFG_ALLOC_DPRAM
#if !defined(CONFIG_CPM2)
	dpram_init,
#endif
#endif
#if defined(CONFIG_BOARD_POSTCLK_INIT)
	board_postclk_init,
#endif
	env_init,
#if defined(CONFIG_8xx_CPUCLK_DEFAULT)
	get_clocks_866,		/* get CPU and bus clocks according to the environment variable */
	sdram_adjust_866,	/* adjust sdram refresh rate according to the new clock */
	init_timebase,
#endif
	init_baudrate,
	serial_init,
	console_init_f,
	display_options,
#if defined(CONFIG_8260)
	prt_8260_rsr,
	prt_8260_clks,
#endif /* CONFIG_8260 */
#if defined(CONFIG_MPC83XX)
	prt_83xx_rsr,
#endif
	checkcpu,
#if defined(CONFIG_MPC5xxx)
	prt_mpc5xxx_clks,
#endif /* CONFIG_MPC5xxx */
#if defined(CONFIG_MPC8220)
	prt_mpc8220_clks,
#endif
	checkboard,
	INIT_FUNC_WATCHDOG_INIT
#if defined(CONFIG_MISC_INIT_F)
	misc_init_f,
#endif
	INIT_FUNC_WATCHDOG_RESET
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
	init_func_i2c,
#endif
#if defined(CONFIG_HARD_SPI)
	init_func_spi,
#endif
#if defined(CONFIG_DTT)		/* Digital Thermometers and Thermostats */
	dtt_init,
#endif
#ifdef CONFIG_POST
	post_init_f,
#endif
	INIT_FUNC_WATCHDOG_RESET
	init_func_ram,
#if defined(CFG_DRAM_TEST)
	testdram,
#endif /* CFG_DRAM_TEST */
	INIT_FUNC_WATCHDOG_RESET

	NULL,			/* Terminate this list */
};

#ifndef CONFIG_MAX_MEM_MAPPED
#define CONFIG_MAX_MEM_MAPPED (256 << 20)
#endif
ulong get_effective_memsize(void)
{
#ifndef	CONFIG_VERY_BIG_RAM
	return gd->ram_size;
#else
	/* limit stack to what we can reasonable map */
	return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
		 CONFIG_MAX_MEM_MAPPED : gd->ram_size);
#endif
}

/************************************************************************
 *
 * This is the first part of the initialization sequence that is
 * implemented in C, but still running from ROM.
 *
 * The main purpose is to provide a (serial) console interface as
 * soon as possible (so we can see any error messages), and to
 * initialize the RAM so that we can relocate the monitor code to
 * RAM.
 *
 * Be aware of the restrictions: global data is read-only, BSS is not
 * initialized, and stack space is limited to a few kB.
 *
 ************************************************************************
 */

#ifdef CONFIG_LOGBUFFER
unsigned long logbuffer_base(void)
{
	return CFG_SDRAM_BASE + get_effective_memsize() - LOGBUFF_LEN;
}
#endif

void board_init_f (ulong bootflag)
{
	bd_t *bd;
	ulong len, addr, addr_sp;
	ulong *s;
	gd_t *id;
	init_fnc_t **init_fnc_ptr;
#ifdef CONFIG_PRAM
	int i;
	ulong reg;
	uchar tmp[64];		/* long enough for environment variables */
#endif

	/* Pointer is writable since we allocated a register for it */
	gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET);
	/* compiler optimization barrier needed for GCC >= 3.4 */
	__asm__ __volatile__("": : :"memory");

#if !defined(CONFIG_CPM2) && !defined(CONFIG_MPC83XX) && \
    !defined(CONFIG_MPC85xx) && !defined(CONFIG_MPC86xx)
	/* Clear initial global data */
	memset ((void *) gd, 0, sizeof (gd_t));
#endif

	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
		if ((*init_fnc_ptr) () != 0) {
			hang ();
		}
	}

	/*
	 * Now that we have DRAM mapped and working, we can
	 * relocate the code and continue running from DRAM.
	 *