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/*
* (C) Copyright 2002-2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* 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
*/
/*
* To match the U-Boot user interface on ARM platforms to the U-Boot
* standard (as on PPC platforms), some messages with debug character
* are removed from the default U-Boot build.
*
* Define DEBUG here if you want additional info as shown below
* printed upon startup:
*
* U-Boot code: 00F00000 -> 00F3C774 BSS: -> 00FC3274
* IRQ Stack: 00ebff7c
* FIQ Stack: 00ebef7c
*/
#include <common.h>
#include <init.h>
#include <command.h>
#include <malloc.h>
#include <devices.h>
#include <version.h>
#include <net.h>
#include <cfi_flash.h>
ulong load_addr = 0; /* Default Load Address */
DECLARE_GLOBAL_DATA_PTR;
#if (CONFIG_COMMANDS & CFG_CMD_NAND)
void nand_init (void);
#endif
ulong monitor_flash_len;
#ifndef CONFIG_IDENT_STRING
#define CONFIG_IDENT_STRING ""
#endif
const char version_string[] =
U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")"CONFIG_IDENT_STRING;
/*
* 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;
static void mem_malloc_init (void)
{
mem_malloc_start = _armboot_start - CFG_MALLOC_LEN;
mem_malloc_end = _armboot_start;
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);
}
/************************************************************************
* Init Utilities *
************************************************************************
* Some of this code should be moved into the core functions,
* or dropped completely,
* but let's get it working (again) first...
*/
static int display_banner (void)
{
printf ("\n\n%s\n\n", version_string);
debug ("U-Boot code: %08lX -> %08lX BSS: -> %08lX\n",
_armboot_start, _bss_start, _bss_end);
#ifdef CONFIG_USE_IRQ
debug ("IRQ Stack: %08lx\n", IRQ_STACK_START);
debug ("FIQ Stack: %08lx\n", FIQ_STACK_START);
#endif
return (0);
}
/*
* Breathe some life into the board...
*
* Initialize a serial port as console, and carry out some hardware
* tests.
*
* The first part of initialization is running from Flash memory;
* its main purpose is to initialize the RAM so that we
* can relocate the monitor code to RAM.
*/
/*
* 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 dependent #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".
*/
extern initcall_t __u_boot_initcalls_start[], __u_boot_initcalls_end[];
void start_armboot (void)
{
initcall_t *initcall;
int result;
int i = 'a';
/* Pointer is writable since we allocated a register for it */
gd = (gd_t*)(_armboot_start - CFG_MALLOC_LEN - sizeof(gd_t));
/* compiler optimization barrier needed for GCC >= 3.4 */
__asm__ __volatile__("": : :"memory");
memset ((void*)gd, 0, sizeof (gd_t));
gd->bd = (bd_t*)((char*)gd - sizeof(bd_t));
memset (gd->bd, 0, sizeof (bd_t));
monitor_flash_len = _bss_start - _armboot_start;
/* armboot_start is defined in the board-specific linker script */
mem_malloc_init();
serial_init(); /* serial communications setup */
for (initcall = __u_boot_initcalls_start; initcall < __u_boot_initcalls_end; initcall++) {
result = (*initcall)();
if (result)
hang();
}
display_banner();
jumptable_init ();
/* enable exceptions */
enable_interrupts ();
/* main_loop() can return to retry autoboot, if so just run it again. */
for (;;) {
main_loop ();
}
/* NOTREACHED - no way out of command loop except booting */
}
void hang (void)
{
puts ("### ERROR ### Please RESET the board ###\n");
for (;;);
}
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